1 Research Division in Electronics Communications and Microsystems Activity Report , May 17th
2 INTRODUCTION The Research Division in Electronics, Communications and Microsystems was created in 2009 at ESIEE-Paris, together with two other divisions: the Informatics Division, and the Innovation Management Division. The Research Division in Electronics, Communications and Microsystems hosts the research activities of the Electronics System Department and the Telecommunication Department of ESIEE-Engineering. It is composed of 29 academic staff members and 28 PhD students. A major part of the research staff (18 permanent members and 24 PhD students) is also associated to the Laboratoire d Electronique Systèmes de Communication et Microsystèmes (ESYCOM), which is a joint research unit UPEMLV-ESIEE-CNAM (EA 2552) of Université Paris-Est. Two permanent members are associated to the Laboratoire de Micorélectronique ENSICAEN-NXP Semiconducteur (LAMIPS). During the period of two years , the research division has produced 167 publications: 44 journal articles, 13 patents, 107 articles in conference proceedings and three book chapters,. 7 PhD theses were defended and 60 contracts and funded projects were completed or are still ongoing,
3 The activities of the Research Division in Electronics, Communications and Microsystems fall into 3 main areas: Sensors: Multiphysics components, micro- and nanotechnology for environment sensing and life science. Communication: Architectures and components for RF and optical communication. Electronics: Electronic systems. The research topics adressed are summarized hereafter : SENSORS : MULTIPHYSICS COMPONENTS, MICRO- AND NANOTECHNOLOGY FOR ENVIRONMENT SENSING AND LIFE SCIENCE Micro Sensors for Biology and Health Neurosciences, Development of MEA for in-vitro and in-vivo application Energy harvesting/scavenging for powering (µ-)sensors Piezoelectric AlN thin film for MEMS application MEMS and NEMS for harsh environment: Application to oilfield exploration Microfluidic devices and Block Copolymer Nanolithography Miniaturized Devices for Environment Sensing and Analysis MEMS-based AFM probe fabrication and integration COMMUNICATION : ARCHITECTURES AND COMPONENTS FOR RF AND OPTICAL COMMUNICATION. MIMO radar systems Microwave Photonics Components Information, Communication and Localization environment for Travelers with Sensory Disabilities in Public Transports Wireless transceivers for mobile terminals: architectures, analysis and signal processing Transceiver architectures and circuits for radiocommunication systems Architectures and circuits for nomadic radiocommunication transmitter ELECTRONICS : ELECTRONIC SYSTEMS Integrated circuits for sensing: compact models and implementation of silicon vision chips and vibrating MEMS Digital ASIC Architectures : Realtime Time-Frequency Analysis and Radiation Hardening Modelling and simulation of multidisciplinary dynamic systems Nuclear Magnetic Resonance: Portable and integrated The different topics together with the corresponding involved poeple are presented in the next pages in the form of a one-page summary.
4 PEOPLE Faculty Emmanuelle Algré, assistant professor Dan Angelescu, professor Philippe Basset, associate professor Geneviève Baudoin, professor Gaëlle Bazin-Lissorgues, professor Corinne Berland, associate professor Yves Blanchard, associate professor Tarik Bourouina, professor Daniel Courivaud, associate professor Valérie Douay, associate professor Antoine Dupret, professor Abdelnasser Fakri, associate professor Cristian Florea, professor Farbod Ghassemi, engineer Frédéric Marty, engineer Bruno Mercier, engineer Florence Nadal, assistant professor Ludovic Noury, assistant professor Nicolas Pavy, engineer Jean-Luc Polleux, associate professor Patrick Poulichet, associate professor Christian Ripoll, associate professor Lionel Rousseau, engineer Patrick Sangouard, associate professor Martha Suarez Penaloza, teaching and research assistant Laurie Valbin, assistant professor Olivier Venard, assistant professor Martine Villegas, professor Férial Virolleau, associate professor
5 Ph.D Students Completed theses: Vincent Georgel, until june 2008 Baptiste Le Foulgoc, until october 2008 Martha Suarez Penaloza, until december 2009 Anand Summanwar, until december Ayyaz Mahmood Paracha, until december Jinane El Sayah, until december Lionel Rousseau, until january Ongoing theses: Rahma Abdaoui Luis Andia Montes Ajib Bahi Alexandre Bongrain Toufic Chmayssani Fadoua Guezzi Messaoud Raphaël Guillemet Pierre Guillot Yaël Joblin Sandeep Kowlgi Srinivasan Amandine Lesellier Abdelmadjid Maali Maurine Malak Karam Olivier Mareschal Stéphane Mebaley Ekome Ronald Montesinos Kinda Nachef Kim Ngoc Nguyen Julien Pagazani Jayalakshmi Parasuraman Fabien Robert Marc Rosales Yasser Sabry Julien Schiellein Maximilien Stoffel Vaclav Valenta Yefeng Yu Weiming Zhu
6 Sensors MULTIPHYSICS COMPONENTS, MICRO- AND NANOTECHNOLOGY FOR ENVIRONMENT SENSING AND LIFE SCIENCE
7 Micro Sensors for Biology and Health Lead: G. Lissorgues. Permanent members: L. Rousseau, L. Valbin, P. Poulichet, C. Ripoll. Associated researchers: S. Picaud, P. Bergonzo, E. Scorsone, F. De Dieuleveult, B. Yvert, C. Dolabdjian, S. Saez. Postdoctoral and PhD. students: A. Bongrain, O. Mareschal, C.T. Phua, A. Patoux. In recent years, many Micro Electro Mechanical Systems have been identified to fulfil applications in biology and health, requesting miniaturisation, biocompatibility, high sensitivity, specific limits of detection, and sometimes wireless transmission links or partially integrated electronics. We have focused in the past two last years on two main fields developing: - new technologies for biological micro sensors either based on diamond film growth or piezoelectric films - new micro sensors for improved health diagnosis Some recent contributions to these topics include: Diamond based micro sensors: For emerging applications such as for bio-sensing, diamond appears to be a promising alternative material for MEMS applications. Indeed, diamond exhibits outstanding mechanical properties such as a high Young's modulus implying that diamond based MEMS will exhibit superior sensitivities when sensing is based on resonating structures. Also, the carbon terminated surface of diamond offers a wide range of opportunities for covalent grafting of specific bioreceptors onto its surface. We have developed polycrystalline diamond micro-mechanical transducers (micro cantilevers, micro resonators) using a new process that requires the direct growth of diamond in silicon moulds involving diamond nano-particles. An emerging application concerns future retinal prostheses based on diamond micro electrode arrays (MEA) ensuring low intrinsic noise, robustness of the microelectrodes, and high current injection limits for the stimulation of neural tissues due to diamond larger electrochemical potential window. Fig. 1. Diamond micro-cantilevers Diamond based retinal implant Piezoelectric micro resonators: We investigated the TFEAR (Thin Film Elongation Acoustic Resonator) operating from 10 MHz to 50 MHz frequencies. This resonator is composed of a piezoelectric Aluminum Nitride (AlN) layer sandwiched between two aluminum (Al) electrodes and manufactured on a silicon substrate. In opposition to common resonator, such a TFEAR works in extensional (elongation) mode excited via the d 31 piezoelectric coefficient. Intraocular Pressure Sensors: Glaucoma is an ocular pathology, leading to the second cause of blindness in people over the age of 50, which is associated with an increase in intraocular pressure (IOP). In this context, a lot of therapies have been developed to lower the intraocular pressure, as elevated IOP is considered unanimously as the main risk factor for vision loss. We are developing disposable eye lenses to measure continuously IOP, using a pressure sensor included in the lens and communicating by radio frequency to an electronic chip located on a glass branch. The IOP information will be then available for ophthalmologists to generate safer diagnostics. Antenna + Sensor Recording circuit Fig. 2. IOP sensor operation principle Blood Pressure Sensors: We proposed a novel method of non-invasive acquisition of blood pulse using the disturbance created by blood flowing through a localized magnetic field. This magnetic method of blood pulse acquisition is applied on the wrist in place of the finger leading to the development of devices capable of continuous blood pressure acquisition, which is unrestrictive for daily activities. Publications: journal articles [10, 12, 21, 24, 38], conference articles [69, 91, 126, 142, 147 ], patent . Other results: Two grants from ANR: ANR Tecsan MEDINAS ( ), MATEO ( )
8 Neurosciences, Development of MEA for in-vitro and in-vivo application Lead: L. Rousseau Permanent members: G. Lissorgues, L. Rousseau. Associated researchers: B. Yvert, J. Sahel, S. Picaud, A. Bendali, E Scorsonne, S. Saada, P.Berbonzo. Postdoctoral and PhD. students: A. Bongrain, L. Rousseau. One challenge of the XXI ème century will be to understand dynamics of large neural networks either in vitro or in vivo and give the possibility to deliver appropriate electrical stimulations to neuronal networks. Today microelectrodes arrays (MEAs) positioned in contact with the neural tissue offer the opportunity to record and simulate neuronal tissue for research and to develop neuroprothesis implant (ex retinal implant, cochlear implant). After to have developed a new type of high density MEA and proposed a new configuration of MEA specifically designed to achieve a local stimulation, we work on two axis : - First axis : Today MEAs offer only a two-dimensional sampling of the neural tissue, while information is distributed in all dimensions of the Central Nervous System. We have developed a true 3D MEA probes. These arrays are built by assembling comb-like 2D arrays. Each comb, composed of several multi-sites shanks, and assembled vertically on specific microconnecting device to perform a 3D array (cf : Fig. 1). - Second axis : Conventional metal MEA electrodes have two majors problems : Intrinsic noise becomes a major limitation when dense arrays of small size microelectrodes are considered and if the injected stimulating current used to the neuronal networks is too high, then irreversible reactions can take place and water is hydrolyzed, which results in the deterioration of both the electrode and the neural tissue. The challenge is therefore to build new types of electrodes that exhibit both a high potential window with respect to water electrolysis, and possess a high electrode reactivity which is important to obtain high signal to noise ratios. We fabricate novel types of MEAs and flexible retinal implant (cf : Fig 2), which are based on artificial nanocrystalline diamond (NCD) layers. Fig. 1 Fig. 2 Publications: journal articles [10,12,22,27,40 ], conference articles [75,92,141 ] patent . Other results: Two grants from Association Nationale de la Recherche (ANR):ANR BLANC «MEA3D», ANR TecSan «MEDINAS».
9 Energy harvesting/scavenging for powering (µ-)sensors Lead: P. Basset. Permanent members: F. Marty, D. Angelescu, T. Bourouina. Associated researchers: D. Galayko (LIP6), Y. Leprince (LPMDI), E. Richalot (ESYCOM/MLV) Postdoctoral and PhD. students: J. Parasuraman, K. Ngoc Nguyen, R. Guillemet. The applications envisaged for wireless and autonomous sensors are increasing every day and address any kind of monitoring systems. However the main bottleneck is the power self-sufficiency of the system. Energy harvesting from the ambient environment could extend the battery running life or better to be rid of battery. Several collaborative projects are ongoing, addressing various energy sources: Smart multi-source Energy Scavenger for Autonomous Microsystems (SESAM): The objective is the elaboration of an energy harvester system able to power multiple loads and dealing with various energy sources. In a previous project ESIEE Paris has fabricated the first fully batch-processed silicon-based vibration energy harvester using electrostatic transduction. The measured converted power was 60 nw with mechanical vibrations of 0.25 g at 250 Hz and for a device of 27 mm 3. In the SESAM project we target 10 µw in the same conditions, and with our colleague from the LIP6 we work on an smart adaptive conditioning electronic to improve the transducer s efficiency when the external vibrations change. COllective Fabrication of Inexpensive Superlattices In Silicon for SiP and SoC thermal management (COFISIS): Hot spots in IC circuits can easily go up to several tens of degrees Celsius above the average temperature of the device and can be a source of tampering some of the features of the component. COFISIS goal is using nanotechnology to reduce the temperature of the localized hot spots with acceptable manufacturing costs and/or recover this thermal energy "wasted" by the components. We are working on the fabrication of thermoelectric vertical superlattices fabricated directly into the silicon substrat. To obtain large layers whose widths are below 100 nm, we experiment an innovative lithography approach based on di-block co-polymer patterning. Thermoelectric/thermoionic micro Energy Source Enhanced by Electromagnetic Radiation (TESEER): In this project we elaborate a 3D structuration of a silicon surface in order to maximized the absorption of the incident light. We already obtained a reflectivity below 1% in the 400 nm 1 µm range, on a full 4-inch wafer with this so-called black-silicon. First objective is to maximize the warm-up of a thermoelectric element, like the one developed in the project COFISIS for instance. Second objective is to combine this absorbent surface with a photovoltaic cell to increase its efficiency. Fig. 1 a) 3D-schematic view of a batch-fabricated Si-based vibration energy harvester, b) pictures of fabricated devices. Fig. 2 Tilted and top views of a black Silicon surface having a 1% light reflection in the visible range Publications: journal articles [20, 26], conference articles [61, 81, 88, 89, 90, 102, 105, 118, 134, 146,161, 162, 163, 172, 174, 175, 176] patent  Other results: 3 grants from Association Nationale de la Recherche (ANR) + 1 grant from the EADS Enterprise Fundation
10 Piezoelectric AlN thin film for MEMS application Lead: L. Valbin Permanent members: G. Lissogues, L. Rousseau. Associated researchers ; C. Dolabdjian, S. Saez (greyc ENSICAEN), R. Bouregba, G. Poullain (crismat ENSICAEN), P. Gamand (NXP). Postdoctoral and PhD. students: O. Mareschal, S. Loiseau. In recent years, piezoelectric thin film for MEMS application has been developed. Some recent contributions to this area of research include : Piezoelectric AlN thin film technology: AlN has been deposited on Al thin film to reach cmos compatible process. Then AlN has been used to realise MEMS like resonators and pressure sensors. AlN process has been transfer to NXP fab in Caen. Piezoelectric micro-resonators: piezoelectric micro-resonator named TFEAR (Thin Film Elongation Acoustic Resonator) using AlN thin film has been developed with ENSICAEN and NXP. These resonators using elongation mode are in the MHz range. Due to their small size, these resonators may be integrated in IC package (SiP: System in package) to replace quartz in high volume application. Piezoelectric pressure micro-sensors ANR program for Intra Ocular Pressure measurement is in progress. Piezoelectric pressure micro-sensor is being developed. Piezoelectric thin film characterization Using piezoelectric micro-resonators electrical and mechanical measurements, elastic, electric and piezoelectric constants extraction is done. Then these constant values are used for simulation to predict MEMS comportement. Fig. 1 TFEAR model (2183 cover) and sem view. Publications: journal articles , conference articles [69, 110, 119].
11 MEMS and NEMS for harsh environment Application to oilfield exploration Lead: F.Marty Permanent members: B.Mercier Associated researchers: E.Donzier, K.Danaie, Hua Chen Postdoctoral and PhD. students: K.Nachef Strategic markets need MEMS and NEMS that can operate in the presence of high temperature, high pressure, corrosive media. Oild field services is one of them, where efficiency of exploration and production activities increasingly depends on implementing new sensors technologies with high performances that can survive harsh environment. We have been developing technologies to fulfil requirements for such sensors in a wide range of physical measurements like pressure, acceleration, or chemical detection. Our technological developments combines the use of standard microelectronics layers such as silicon nitride, silicon oxide or polysilicon to create circuitry and specific etching and packaging steps to fabricate MEMS,MOEMS or NEMS. We proposed new possibilities in terms of size reduction, high performances and reliability by developing advanced Deep Reactive Ion Etching (DRIE) processes and associated steps on SOI wafers. In particular, high aspect ratio moving structures were fabricated using modified bosch process. Specific packages including silicon to pyrex bonding, Si direct bonding and Si to plastics bonding were evaluated. Wafer level packaging was also investigated with hermetic sealing under vacuum using getter films. The combination of these process steps have enabled, for example, prototyping of accelerometers, density/viscosity sensors, piezoresistive pressure sensors, resonant pressure sensors, silicon resonators or micro-chromatographs. Fig. 1 Density/Viscosity MEMS at wafer level and individually packaged. Publications: journal articles [5, 8, 16, 45], conference articles [58, 144].
12 Microfluidic devices and Block Copolymer Nanolithography Lead: D. Angelescu Permanent members: B. Mercier, N. Pavy, F. Marty, E. Algre, T. Bourouina, P. Basset Associated researchers: R. Hohler, Y. Leprince, E. Lorenceau, P. Chaikin, R. Register Postdoctoral and PhD. students: M. Stoffel, J. Parasuraman, X. Yuan One of our activities in microfluidics involves the design of a microfluidic system which measures pressure drops along microfluidic channels involving different types of constrictions using embedded MEMS microsensors. We have achieved a design (Figure 1) which will allow us to gain important information about the complex rheology of the fluid passing through a microchannel, and are currently in the manufacturing phase. When a fluid is forced through a channel at a given (known) flow rate, there is a pressure gradient which develops along the channel which depends on the rheology of the fluid, on the type of particles that may be suspended in the fluid, and on the channel s geometrical details. The pressure drop between two sampling points on the channel can be measured using the deflection of an elastic silicon membrane (used as a differential pressure transducer). Pressure, flowrate, surface effects, temperature, viscosity are all fluid parameters which influence the response of the membrane. By controlling the majority of these parameters, we attempt to demonstrate that the membrane response can be used to recognize different types of particles, and particularly to detect elastic vesicles such as emulsion droplets or cells. Onother activity in microfluidics is centered around developing sensors for monitoring water quality in urban areas, and particularly for monitoring the chlorine concentration in the water. There are no sensors currently on the market which allow the in-line monitoring of chlorine concentration in urban water pipes. Our activity here is centered on the development, in conjunction with several industrial partners, of a microfluidic chlorine sensor based on an original idea and design. Figure 1 : Current design of the microfluidic rheology sensor Figure 2 : Preliminary results showing 3 :1 and higher aspect ratio etchning obtained at ESIEE using block copolymer templates Block copolymers are self-assembled systems which present a viable route to bottom-up nanofabrication. They are able to reach scales of nm, with controlled periodicity, and therefore are seen as a potential replacement for certain top-down technologies such as electron beam lithography, which lack both the resolution and the cost benefits of block copolymer techniques. The use of block copolymer templates as nanolithography masks has been long performed using isotropic roomtemperature reactive ion etching techniques. These allow a certain selectivity over the species, however their possibilities are reaching the limits of the technology : aspect ratios are limited to numbers close to 1. We are currently trying to leverage the expertise accumulated at ESIEE and Princeton in both copolymer processing and exotic plasma etching techniques, and to improve the state of the art for etch depth using copolymer templates, thus providing viable routes to nanofabrication of useful devices (nanoresonator arrays to be used in applications such as ultra-sensitive mass sensors, chemical and biological detection). Our current progress includes succesful trials, using cryogenic etching techniques, on block copolymer templates provided by our Princeton collaborators. We have already been able to achieve aspect ratios of 3 to 1 for nanostructures with 40nm pitch, which are superior to anything published in the literature. We are currently developing the pattern transfer process using commercially available block copolymers. The future plan is to include alignment steps in the fabrication protocol, more specifically to provide aligned copolymer templates which would allow the manufacturing of ultra-dense nanoresonator arrays. Publications: journal articles [16, 39], conference articles [58, 171] patents [184, 185, 186, 187, 188, 189]
13 Multiphysics Devices for Environment Sensing and Analysis Lead: T. Bourouina. Permanent members: E. Algré, D. Angelescu, P. Basset, V. Douay, N. Fakri, F. Ghassemi, F. Marty, B. Mercier, N. Pavy. Associated researchers: E. Donzier, S. Moularat, F. Neuilly, B. Saadany, D. Khalil, A.Q. Liu, Y. Mita. PhD. students: E. Tavernier, B. Le Foulgoc, A. Summanwar, K. Nachef, Y. Joblin, Y.Yu, W Zhu, M. Malak-Karam,. As the last interface between nature and the digital world, sensors are at the source of all modern information and communication systems. Their deployment in large numbers in almost all fields of science and technology is made possible today due to the booming miniaturization capabilities. However dealing with such small sensors brings new exciting scientific interest as well as technological challenges. Performance of such sensors is the first concern, the objective being to reach at least similar characteristics as macroscopic sensors, while the opportunity is to take advantage of some favourable downscaling laws, and also of some specific (nano)materials and of novel technological processes as well as original operation principles. Another feat is the wide diversity of information that one can get from a given environment, which calls for multiphysics coupling, sometimes with interactions to chemistry and biology as well. This diversity of information also suggests a need of selectivity for those sensors, which makes us thinking on evolving from the concept of micro-sensors to that of analysis microsystems. Our recent contributions in this area include: High-Q resonant sensors. The quality factor Q of a resonator plays a key role on the performance of a sensor based on frequency output; high Q value has a direct impact on performance. Theoretical and experimental investigations conducted on silicon have shown that this material offers a much better compromise than quartz does at the microscale. Q values of 10 6 up to 10 8, are predicted while the typical values found in the literature are only The identified ultimate limit is due to thermoelastic loss; however, reaching such level requires getting rid of other sources of energy dissipation, especially operation under moderate vacuum and excellent mechanical decoupling. Baptiste Le Foulgoc defended his Ph.D thesis on this topic in the frame of a collaboration with ONERA and IEF with a support from DGA. Experimental Q values of 2,10 5 have been reached, well within the state of the art of resonators operating in bending mode. This study also highlighted the importance of controlling technological processes (etching DRIE and KOH) and the expression of surface effects. Photonic MEMS are being studied for the potential superior measurement capabilities provided by optics. The laboratory innovation is related to a major building block which consists of highly reflective Bragg mirrors made by stacks of silicon and air thin vertical layers obtained by DRIE. This was at the basis of several studies on different device architectures, including optical resonators and interferometers. A Fourier Transform Infrared optical spectrometer (µ-ftir), which may be used for chemical analysis, was developed based on this knowledge and was successfully transferred to industry. On the other hand, optofluidics offers other kinds of highly performing photonic devices with potential applications to biological measurements under liquid environment. There are three ongoing Ph D thesis on this topic : Weiming Zhu, Maurine Malak and Yefeng Yu. Micro Gas Chromatography (GC) is a very promising technique for analyzing gas mixtures. It is selective enough, sensitive enough and potentially versatile enough, to address very different applications such as natural gas analysis (Ph D thesis of Kinda Nachef with Schlumberger) detection of biological process through COV analysis (Ph D thesis of Yaël Joblin with CSTB) and air quality monitoring (IMMANENT project underway with LCPC and LNE) Fig. 1(a) Ultra-compact, all silicon FTIR micro-optical spectrometer. Fig. 1(b) Recorded interferogram and its Fourier transform leading to the optical spectrum of input light. Publications: journal articles [8, 9, 13, 17, 18, 19, 34, 36, 37, 45] conference articles [71, 82, 83, 93, 101, 106, 121, 122, 123, 132, 144, 145, 158, 159, 173], patents [190, 194]. Other results: Long-term industrial research contract with SWS with technology transfer to a big international group on photonic MEMS, 2 CIFRE Grants with Schlumberger, 1 CIFRE Grant with NXP, 1 CIFRE Grant with CSTB, 1 Grant from MEDDM, 1 international Grant from EGIDE, 1 Grant from DGA.
14 MEMS-based AFM probe fabrication and integration Permanent member: E. Algré, Associate researcher: B. Legrand, M. Faucher, L. Buchaillot, PhD Student: B. Walter, Z. Xuong This work was done while Emmanuelle Algré worked in the IEMN Laboratory. ( ) This project is supported by the European Research Council and by the French National research Agency. The aim is to replace conventional Atomic Force Microscope (AFM) probe by high performing probe constituted of electromechanical silicon ring resonator. Since its invention by Binnig in 1986, AFM microscopy has been improved to realize nanoscale surface imaging and force spectroscopy. But conventional AFM probes are still not well performing to realize real-time imaging of biological nanosystem. Indeed their performances are degraded by viscosity forces in liquid and rate imaging is limited by their low resonance frequency. Moreover detection mode of the probe displacement, which uses a laser reflexion, is not well adapted to measurement in liquid. We proposed a new concept of AFM probes using bulk-mode silicon resonators (Fig. 1). There are formed of ring resonator which exhibit high resonance frequency. Then the sense and drive of resonator is integrated close to the ring thanks to capacitive actuation. So we fabricated devices with resonance frequencies at about 1MHz in order to accommodate at first the bandwidth limitation of the commercial AFM set-up in which the probes were integrated. The aim was to demonstrate AFM microscopy with these new kinds of probes. The clean room fabrication process was optimized to achieve high performances. MEMS-Based AFM probes were fabricated from SOI wafers using photolithography and deep reactive ion etching. They were characterized electrically and implemented on a commercially available AFM set-up (Fig. 2). The commercial set-up was modified by adding a dedicated circuit board supporting the MEMS probe. We have realized AFM images with MEMS-probe on nanometric patterns and characterized the probe sensitivity (Fig.3). Figure 1 : Working principle of AFM Microscopy using a MEMS-based AFM probe Figure 2 : Overview of the experimental set- Figure 3 : AFM images of 100nm large, 30nm high and spaced by 400nm lines Publications: journal article , conference articles [124, 160].
15 Communication ARCHITECTURES AND COMPONENTS FOR RF AND OPTICAL COMMUNICATION.
16 MIMO radar systems Permanent members: F. Nadal, P. Jardin. Associated researcher: S. Middleton. Multiple-input and multiple-output (MIMO) radar systems use arrays of transmitting and receiving antennas like phased array radars but while a phased array transmits highly correlated signals which form a beam, MIMO antennas transmit signals from a diverse set and independence between the signals is exploited. These systems can increase the radar resolution, the number of targets that can be identified, and the flexibility in beampattern design in comparison with standard phased array radars. In particular they offer the possibility of sending the transmitted power towards the directions of multiple targets (Figure 1). To date, most of the work on MIMO radar has been performed assuming the signals are narrowband. We started our study in september 2008 under this narrowband configuration to familiarize ourselves with this subject. However, wideband signals can improve radar resolution, among other benefits, and are sometimes unavoidable when stringent range resolution specifications must be met. Therefore we have proposed a method for extending the MIMO narrowband model to a wideband model. This method implements a wideband beamformer which includes a filter on each channel of the receive array. The new model we derived allows the adaptation of well-known adaptive techniques (Capon, GLRT) for the target parameter identification (Direction Of Arrival and reflexion coefficient β) (Figure 2). Furthermore we designed a suboptimal transmit beampattern synthesis technique, which can be used in the context of wideband signals (Figure 1). This technique is derived from the exact expression of the spatial power distribution involving the CSDM (Cross-Spectral power Density Matrix) beampattern DOA in Fig. 1 Transmit beampattern. 1 Capon (β) GLRT DOA ( ) Fig. 2 Capon and GLRT spectra with an omnidirectional transmitted beampattern with narrowband (dashed line) and wideband (solid line) processing. Publications: conference article [155, 170].
17 Microwave Photonics Components Lead: J.L. Polleux Permanent members: JL.Polleux Associated researchers: C.Algani, A.L. Billabert, C. Rumelhard Postdoctoral and PhD. students: M. Rosales, J. Schiellein, F.Duport. Microwave Photonics is a field at the frontier of RF/Microwaves and Photonics that has long been associated to niche markets such as military applications and was not sufficiently powerful to sustain tough specific components technological developments. From 2001, the group have contributed to develop the field both toward new applications with wider markets such as Radio-over-Fibre in local home networks and as well toward new functions that electronic cannot compete with. Though, the development of novel components has gain better promises addressing efficiently specific requirements of analog microwave-photonic. Satisfying the need in direct compatibility with standard microelectronic or photonic industrial technologies is one of the main chances of success of that approach. Some recent contributions of the group from 2008 to 2009 to this area of research include: Microwave Phototransistors. This action is the specialty of the group to which we put a target of international excellence. Theory of the behavior of heterojunction bipolar transistors (HPTs) has been developed to take into account from about 10years now from the group. The team has significantly contributed to the development of novel characterization techniques. Main developments are conducted on SiGe HPTs to address wavelength between nm, while InP/InGaAs have gained an opportunity to be reexamined for active antenna applications. Novel InP/InGaAs HPTs: InP/InGaAs HPTs have been studied up to about 2004 in Europe. In the group, we fostered to re-examine this component in collaboration with THALES and the Alcatel-Thales III-V lab while proposing to design a phototransistor in a conventional electrical InP technology. As layout only was modified, optical absorption layers are thus limited to the base InGaAs region. Somehow low efficiency of less than 1A/W is then obtained with however two main expected advantages: - the three port structure of the phototransistor will enable such a signal to lock a freerunning oscillating signal with enhanced phase noise capabilities, even with low responsivity; - the vertical stack nature of the component in the base-collector region, close to those of UTC-PD, will prevent from high optical injection slowing-down effects. The former may benefit to wireless PON networks, and the latter to the distribution of ultra-pure clock/oscillator signals. Optoelectronic load pull effect: Matching a phototransistor need to have in consideration that photo-generated carriers flow in directions of both the collector and the base. Such a consideration indicates that the overall gain of the HPT could be optimized with purely reactive base load impedance. Three-port theory helps to determine the phase of such a load though a numerical analysis. Nevertheless such a precise knowledge of the two paths cannot be achieved directly with existing standard measurement techniques. We therefore proposed in an indirect technique called optoelectronic load-pull in which the base load impedance is tuned over a wide range of frequency as closely as possible to the border of the Smith chart. Direct validation of the theory expectations has thereby been obtained and gains improvements as high as 20dB on SiGe HPTs and 10dB in InGaAs HPTs have been demonstrated. Spatial effects in the opto-microwave response of Phototransistors: It is also important to analyze how the position of an optical beam injection in the phototransistor will affect the dynamic response. Mapping of SiGe HPTs and InGaAs HPTs response were therefore conducted with the use of nano-controlled optical probe (focusing lensed fibers) scanning the optical window of the component. Low frequency gain and cutoff frequency across the whole detection area of the phototransistor were extracted. These characterizations leaded to better understanding of the impact of electrode positions in SiGe HPTs. Efforts are continued on that promising technique. Silicon Photonic for Microwave Photonics. Deep etched 1D photonic crystals are successfully developed in another team of the lab, conducted by Pr. T. Bourouina, with the purpose to drive the light into a collimated path across Bragg mirrors and Bragg resonant cavities. Transverse confinement could be a key advantage of that building bricks. The microwave photonic group did contribute therefore in a reinforcement of this latter team in designing and modeling original structures. This item should benefit more deeply in the following years. Integration within system applications and opto-electronic integrated circuits (OEIC). This action was strongly conducted in collaborative projects with the ESYCOM team, CNAM and ESIEE, and with Orange labs and partners of the ANR BILBAO project from 2005 to The group did contribute mainly to advanced simulations of noise and nonlinearities properties of the Radio-over-Fibre link to provide an optimized Optical infrastructure for wireless local home networks with Dr. AL. Billabert and Pr. C. Algani. Hybrid components on the shelf were successfully used to demonstrate the concept of optical infrastructure to transmit 3-10GHz UWB signals. This should therefore enable to extend UWB wireless radio cell from one room to the whole home network. Novel quantities were defined so as to afford a better understanding of components individually. Mainly equivalent power gain and noise figure were developed extended from the microwave to the microwave-domain. Publications: journal articles [11, 17, 23, 29], international conference articles [72, 73, 80], national conference articles [113, 114, 128, 129, 130, 140]. Other results: One grant from DGCIS : FUI «ORIGIN». Two industrial grants from VECTRAWAVE 2010 «ROHYLAB» and from THALES Air Systems «PHOSI»
18 Information, Communication and Localization environment for Travelers with Sensory Disabilities in Public Transports Lead: G. Baudoin and O. Venard. Permanent members: B. El Hassan Associated researchers M.-F. Dessaigne, G. Uzan, Y. Lemaitre, P. Orvain, G. Hendryckx Postdoctoral and PhD. Students, engineers: J. Sayah, S. Pretorius, D. Hnilica + many students + for a part of their work T. Chmayssani, A. Maali Despite the progress of information, localization and communication technologies (ICT), traveler information is still very difficult to access for people with sensory disabilities (visual or auditory) during their journeys in urban public transports and in cities Several aspects are to be taken into account for the design and the wide deployment of transport information systems accessible to sensory impaired persons: technical questions (information, communication, localization, energy), ergonomics, economics, legal and normative context. This research theme is a transversal subject supported by an ANR and a FEDER project: INFOMOVILLE (ANR PREDIT project) and WiKiWalk (FEDER project). We cooperate with specialists of ergonomics and different companies (LUMIPLAN? NOMADIC? GeoConcept, Natural Touch). Research at ESIEE is mainly focussed on technical aspects of localization, information and communications. The INFOMOVILLE project, in partnership with Lumiplan, ergonomos and inerec, aims to design a real time information, communication and localization environment for improving the mobility of travelers with visual or auditory disabilities in Public Transports. The system is based on user devices (smartphones) and fixed equipments installed at stops places or in connection links. These equipments are connected to a transport central server. The first experimentation of the system is done in Lyon in cooperation with SYTRAL (Transport authority). The Wikiwalk project, in partnership with Nomadic solution, GeoConcept and Natural Touch, aims to design a voice guidance system for pedestrians using only the voice channel of the phone to transmit GPS data to a central server. The central server uses a geographic information system to calculates a route and returns guidance instructions to the user. Our work is focused on the device connected to the user phone and on the GPS data transmission using the voice channel of the phone. We work on: - Localization techniques using WiFi, GPS or ultra wide band systems. - Modelization of transport Information for people with sensory impairments. - A new software framework for the design of vocal embedded applications on smartphones. - Wireless communications and networks for nomadic applications. Bus 53 arrival imminent Text to speech, Command keys, Screen, Vibrator Information Timetables, Routes, Maps, Guiding, Events WiFi connection Local information Maps, Guiding instructions Transport information Central server 3G GPS coordinates The infomoville system Publications: journal articles [28, 55], conference articles [63, 67, 78, 84, 85, 98, 104, 117, 131, 143, 112, 108, 109, 111, 133, 138, 154, 156, 157] patents [191, 192]. Other results:, 1 ANR project INFOMOVILLE, 1 FEDR project WiKiWalk
19 Wireless transceivers for mobile terminals: architectures, analysis and signal processing Lead: G. Baudoin. Permanent members: M. Villegas, M. Suarez (since November 2009). Associated researchers: A. Diet, R. Marsalek, D. Belot, J. Schwoerer Postdoctoral and PhD. students: R. Abdaoui, L. Andia, A. Bahi, S. Mebaley, M. Suarez ( ), V. Valenta, Multicarrier OFDM and multi-antenna MIMO techniques have emerged as enabling technologies for 4G communication systems. They have also generated new challenges in term of transmitter architectures with good efficiency and linearity, and in term of integration of transceiver and antennas in mobile user terminals. Smart everyday objects incorporating sensors, wireless communication and positioning devices, are supporting many new applications such as environment monitoring, machine-to-machine communications and body area networks. They require low cost, low power consumption smart transceivers. Our work focuses on wireless transceivers for multi-radio and future cognitive radio terminals, millimeter wave mobile communications with low power consumption and ultra-wide band transceivers (UWB). We address the problem with two complementary perspectives: RF technology and digital technology using signal processing. Association of digital technologies and signal processing is a very fruitful approach for baseband and RF parts of wireless transceivers in terms of integrability, reconfigurability, adaptativity and smart processing. Our main recent contributions are the following ones: High efficiency signal generation architectures with good linearity and flexibility for multi-frequency, multi-standard mobile transmitters: - Design of new architecture efficient and robust to power amplifier non-linearities based on a combination of EER (envelope elimination and restoration) and LINC (Linear amplification with non linear components). Theoretical analysis of components impairments of the performances of these architectures. - Use of switched power amplifiers in RF transmitters: Analysis of the influence of envelope coding on the performance of a class E power amplifier. Design of multi-band class E power amplifier. - Specifications of a polar sigma-delta architecture associated to a high efficiency switched mode power amplifier for multistandard mobile transmitters including Wimax or LTE standards. - Proposal of a cartesian transmitter architecture using baseband sigma-delta modulators and switched power amplifier. Analysis of the constraints and influence of sampling frequency. - Analysis of front end filtering requirements on a mobile cognitive multi-radio transmitter Frequency synthesis and PLL (Phase Locked loop) using digital signal processing for multistandard transmitters and future cognitive transmitters: - Exact calculation of phase noise of RF Digitally Controlled Oscillator with frequency resolution improved by dithering. - Study of frequency synthesis in a multistandard transmitter architecture: o design of a PLL based frequency synthesizer using switched loop bandwidth for mobile transmitters: optimization of the trade-off between bandwidth and lock-up time for switching of the loop filter; phase noise analysis; dual Mode Hybrid PLL Based Frequency Synthesizer for Cognitive Multi-Radio Applications. Towards cognitive radio networks: - Spectrum utilization measurements and Analysis of spectrum utilization in some urban and suburban environments. Evaluation of potentials for cognitive radio. Physical layer and transceiver architecture design for ultrawideband (UWB) communications - Millimetre wave mobile transceivers: specification and performance analysis of a Multi band, on-off keying, Impulse radio UWB transceiver for low cost, low power consumption mobile millimetre wave transceivers./ - Design of a physical layer for UWB impulse radio body area network. psd of DCO output signal 0-50 Theoretical psd psd estimated on simulated signal Cartesian Sigma Delta transmitter architecture frequency in Hz x 10 9 Power Spectral density (psd) of DCO output signal: theoretical and estimated on simulated signal Publications: book chapters [2, 3], journal articles [7, 15], conference articles [59, 60, 64, 65, 66, 68, 77, 87, 94, 99, 100, 108, 109, 111, 112, 115, 133, 136, 138, 154, 156, 157]. Other results: 3 Best paper awards, Chair of the EuWiT 2010 conference
20 Transceiver architectures and circuits for radiocommunication systems Lead: C.Berland, in association with J.F. Bercher Algorithm for polar and LINC transmitter architecture With J.F Bercher, we focused our work on on the specific point of the synchronization of signal in multipaths transmitter such as LINC and Polar architecture. For the polar architecture, the transceiver introduces two different delays on envelope and phase paths. This impacts directly the quality of the emitted signal, in terms of output spectrum and EVM (Error Vector Magnitude). In the case of LINC transmitter, the synchronisation between the original signal and the transmitted one has to be realised for the implementation of correction algorithms. We worked on a LMS (Least Mean Square) algorithm that allows through an iterative formulation to find the minimum of an error function. We defined two differents procedures, according to the architecture, to compensate for transmitter impairments. Generation of high frequency reference signals This work is realised in collaboration with NXP semiconductors has the form of a PHD funding (CIFRE) that has started in The subject, also in relation with transceiver architecture, is focused on the problematic of high frequency reference signals: generation and impact on architecture. We worked on the realization of a reference oscillator at 2 GHz based on the use of a Bulk Acoustic Wave solidly mounted resonator. Once this oscillator realized, we worked on the principle of the readjustment of the output frequency and to acheive this goal we applied Kalman filter techniques. Lead : C.Berland Low current consumption receivers This work is realised in collaboration with NXP semiconductors on the problematic of low current consumption receivers for automotive applications. The objective is the reduction by a factor 2 of current consumption compared to actual solutions (same functionality). We are investigating sub sampling architecture. Wideband VCO This work is realised in collaboration with NXP semiconductors on the problematic of the realization o f wideband VCO for radiocommunication systems. Lead C ;Berland, in association with O. Venard Transmitter architecture for cellular Base Station In the context of a European project, CATRENE PANAMA started in 2009, we are working on transmitter for multimode SDR base station. The focus of the work is the increase of the efficiency of wideband and/or tunable transmitter. We are investigating new transmitter solutions derived from LINC and Doherty principles. The work includes both signal processing and radio architecture, the optimization of the solution is realized considering jointly these aspects. In this project, we also setting up a validation platform based on a SDR development board and evaluation component kits available of the shelf. We intend to realize a demonstrator of the transmitter Sizing of 2G/3G receivers for hand portable with active filters This work is realised in the context of a French research ministry contract: ANR/RNRT in 2006, SRAMM. The objective of the project is to integrate actual external passive antenna filters in receiver ICs for applications such as GSM, 3G and digital broadcast systems. The project SRAMM (Systèmes de Réception Adaptatifs Multimodes Multistandards) is made in collaboration with NXP semiconductor, Thomson R&D France (Rennes), the research laboratory XLIM (Limoges), the research laboratory IREENA (Nantes) and AMCAD Engineering (small Company in Limoges). Our role in this project is the specification of filter templates for the studied applications. For this, we are developing a simulation environment for the sizing of receiver in the context of multimode system and duplex systems. Publications: journal articles [30, 31,41], conference articles [76, 86, 95, 96, 148, 149].
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