AM Receiver Dr. Lynn Fuller, Zach Lopez Webpage:
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1 ROCHESTER INSTITUTE OF TECHNOLOGY MICROELECTRONIC ENGINEERING AM Receiver, Zach Lopez Webpage: 82 Lomb Memorial Drive Rochester, NY Tel (585) Fax (585) Department webpage: PLAY OscillatorCircuits.ppt Page 1
2 INTRODUCTION This document looks at circuit designs for an AM Receiver and Transmitter. SPICE simulations and breadboard results of those circuits are presented. Page 2
3 LC FILTER Page 3
4 FILTER AND AMPLIFIER CIRCUIT Page 4
5 OUTPUT OF FILTER AND AMPLIFIER Page 5
6 FILTER PASSES 500KHZ SIGNALS Page 6
7 FILTER BLOCKS 100KHZ SIGNALS Page 7
8 ONE STAGE OF AMPLIFICATION Page 8
9 TWO STAGES OF AMPLIFICATION Page 9
10 VOLTGES Page 10
11 BLOCK DIAGRAM Antenna LC Bandpass Filter CC-BJT Amplifer Gain = 1 CE-BJT Amplifer Gain = 100 CE-BJT Amplifer Gain = 100 Peak Detector Demodulator Ear Phone or Speakers Page 11
12 FINAL AM RECEIVER CIRCUIT Page 12
13 MOVIE FOR BREADBOARD OF AM RADIO Page 13
14 SYSTEM DESCRIPTION This project is to create a wireless platform for MEMS sensor networks. This includes a transmitter that can be integrated with the MEMS device and a receiver for collecting data from the MEMS sensor. The MEMS device will exhibit a change in resistance or capacitance in response to a change in a physical quantity such as acceleration, pressure or temperature. An RC oscillator is used to amplitude modulate the carrier frequency. R or C is expected to change approximately 10% changing the time constant of the RC oscillator and frequency of the modulation. For example the frequency of modulation might be ~2Khz +/-10% depending on the value of pressure. The receiver demodulates the ~2Khz signal from the 1.1Mhz carrier and provides an analog voltage that can be monitored with a microprocessor. The signal is converted from A-to-D and stored in memory. Page 14
15 SYSTEM DESCRIPTION (CONTINUED) The wireless platform can be modified to monitor multiple sensors simultaneously. Higher frequency transmitters and better antenna systems can extend the range of the wireless transmission. Transmitter power can be reduced through improvements in oscillator design. Energy harvesting technology can be used to power the transmitter. MEMS sensors that provide outputs such as change in voltage or current could be used with oscillator modification. Page 15
16 BLOCK DIAGRAM FOR AM TRANSMITTER ~1 Mhz Carrier Freq Oscillator Mixer Antenna MEMS Sensor D R or DC AM RC Oscillator ~2 Khz Page 16
17 AM RECEIVER BLOCK DIAGRAM Antenna LC Bandpass Filter BJT Amplifer Gain = 10K AM Receiver Peak Detector Microcontroller Page 17
18 SIMULATION OF NMOS INVERTER WITH HYSTERISIS OSCILLATOR CIRCUIT Page 18
19 SIMULATIONNMOS INVERTER WITH HYSTERISIS OSCILLATOR RESULTS Page 19
20 AMPLITUDE MODULATION (AM) SIMULATION Page 20
21 SIMULATION OF MODULATION FOR AM TRANSMITTER Page 21
22 BREADBOARD OF NMOS OSCILLATOR Page 22
23 OSCILLATOR BREADBBOARD OUTPUT Page 23
24 SCHEMATIC OF OSCILLATOR/MODULATION TRANSMITTER Page 24
25 OUTPUT FROM BREADBOARD Page 25
26 CONFIRMATION OF WIRELESS COMMUNICATION Page 26
27 MOVIE FOR AM TRANSMITTER Page 27
28 ANTENNAS????? In electronics, a ferrite core is a type of magnetic core made of ferrite on which the windings of electric transformers and other wound components such as inductors are formed. It is used for its properties of high magnetic permeability coupled with low electrical conductivity (which helps prevent eddy currents). Because of their comparatively low losses at high frequencies, they are extensively used in the cores of RF transformers and inductors in applications such as switched-mode power supplies, and ferrite loopstick antennas for AM radio receivers Page 28
29 LIST OF THINGS TO DO AM Receiver: Design and build PCB version of AM radio receiver AM Transmitter: Investigate R and C values and oscillator frequency Investigate replacement of pull up resistors with transistors Simulate PMOS version of AM Transmitter Simulate transmitter including two oscillators (carrier & modulation) and NOR gate mixer Breadboard transmitter including two oscillators (carrier & modulation) and NOR gate mixer Breadboard final design and verify transmitted signal can be received Integrate pressure sensor with the transmitter MEMS Pressure Sensor & Transmitter Integration: Investigate how to have oscillator frequency change with pressure Do MEMS layout that includes both pressure sensor and transmitter Page 29
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