Application Note No. 154

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1 Application Note, Rev. 1.2, February 2008 Application Note No. 154 ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass Filter Application RF & Protection Devices

2 Edition Published by Infineon Technologies AG München, Germany Infineon Technologies AG All Rights Reserved. LEGAL DISCLAIMER THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE IMPLEMENTATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION NOTE MUST VERIFY ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION. INFINEON TECHNOLOGIES HEREBY DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND (INCLUDING WITHOUT LIMITATION WARRANTIES OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF ANY THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office ( Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

3 Application Note No. 154 Revision History: , Rev. 1.2 Previous Version: , Rev. 1.1 Page Subjects (major changes since last revision) All Small changes in figure descriptions Application Note 3 Rev. 1.2,

4 1 ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass Filter Application Applications LNA + Filter for Set Top Box (STB) to improve sensitivity / range of wireless remote-control. Overview The ESD-Hardened BFP460 Transistor with 1500 V Human Body Model ESD rating is shown in a low-cost, broadband LNA MHz Bandpass Filter circuit. The LNA is unconditionally stable from 5 MHz to 8 GHz, and is optimized for wide bandwidth, ease-of-use & low cost only resistors & capacitors used no coils needed for the LNA. The optional bandpass filter is a top C coupled configuration using 5 capacitors and 2 inductors. The filter may be bypassed and each block (LNA and filter) may be tested separately. The LNA block is usable from under 200 MHz to over 1 GHz inclusive. Target Specification, 434 MHz Gain 15 db min.; NF < 2 db; OP 1dB +5 dbm min.; I = 10 ma max. Summary of Results T = 25 C, network analyzer power ~ -30 dbm, V S = 5.0 V, V CE = 3.1 V, I =9.7 ma. Table 1 LNA Only Freq. db [s11]² db [s21]² DB DB NF * IIP 3 OIP 3 IP 1dB OP1dB Comments MHz [s12]² [s22]² db dbm dbm dbm dbm FM broadcast RKE frequency Desired f C Cellular band Table 2 Bandpass Filter Only Freq. db [s11]² db [s21]² db [s12]² db [s22]² NF * IIP 3 OIP 3 IP 1dB OP 1dB Comments MHz db dbm dbm dbm dbm FM broadcast RKE frequency Desired f C Cellular band Table 3 Cascade of LNA + Bandpass Filter Freq. db [s11]² db [s21]² db [s12]² db [s22]² NF * IIP 3 OIP 3 IP 1dB OP 1dB Comments MHz db dbm dbm dbm dbm FM broadcast RKE frequency Desired f C Cellular band * Note that PCB loss is not extracted. If PCB loss were extracted, NF would be approximately 0.2 db lower. Application Note 4 Rev. 1.2,

5 Block Diagram Figure 1 Block Diagram of Cascade Cross Sectional Diagram of PC Board Figure 2 PCB - Cross Sectional Diagram Application Note 5 Rev. 1.2,

6 Application Note No. 154 Schematic Diagram Figure 3 Schematic Diagram Application Note 6 Rev. 1.2,

7 Scanned Image of PC Board Figure 4 Image of PC Board Application Note 7 Rev. 1.2,

8 Scanned Image of PC Board, Close-In Shot. Figure 5 Image of PC Board, Close-In Shot Application Note 8 Rev. 1.2,

9 Noise Figure, Plot, 225 to 945 MHz, LNA alone. Center of Plot (x-axis) is 585 MHz. Figure 6 Noise Figure, LNA alone Application Note 9 Rev. 1.2,

10 Noise Figure, Tabular Data, LNA alone From Rohde & Schwarz FSEK3 + FSEM30 + System PreAmp Table 4 Noise Figure, LNA alone Frequency Noise Figure 225 MHz 1.38 db 255 MHz 1.40 db 285 MHz 1.39 db 315 MHz 1.41 db 345 MHz 1.42 db 375 MHz 1.42 db 405 MHz 1.41 db 435 MHz 1.41 db 465 MHz 1.43 db 495 MHz 1.43 db 525 MHz 1.44 db 555 MHz 1.47 db 585 MHz 1.47 db 615 MHz 1.46 db 645 MHz 1.48 db 675 MHz 1.49 db 705 MHz 1.51 db 735 MHz 1.47 db 765 MHz 1.48 db 795 MHz 1.51 db 825 MHz 1.51 db 855 MHz 1.53 db 885 MHz 1.56 db 915 MHz 1.57 db 945 MHz 1.55 db Application Note 10 Rev. 1.2,

11 Gain Compression, LNA alone, at 434 MHz, V S = 5.0 V, V CE = 3.1 V, I = 9.7 ma, T = 25 C Amplifier is checked for 1 db compression point. An Agilent power meter was used to ensure accurate power levels are measured (as opposed to using Vector Network Analyzer in "Power Sweep" mode). Output P 1dB dbm; Input P 1dB dbm + (Gain - 1 db) = dbm db = +0.6 dbm Note gain compression performance can be improved by using an inductor as an RF Choke, in place of resistor R3. But resistor was used as a low-cost Choke to reduce cost. Table 5 Gain Compression of LNA alone P IN, dbm Gain, db Figure 7 Plot of Gain Compression, LNA alone Application Note 11 Rev. 1.2,

12 Stability. LNA alone Rohde and Schwarz ZVC Network Analyzer calculates and plots Stability Factor K in real time, from 5 MHz to 8 GHz. Note K>1 over entire range showing unconditional stability. Figure 8 Plot of K(f) for LNA alone Application Note 12 Rev. 1.2,

13 Third Order Intercept Point, LNA alone Input Stimulus: f 1 = 433 MHz, f 2 = 434 MHz, -29 dbm each tone. Input IP 3 = (42.9 / 2) = -7.6 dbm Output IP 3 = -7.6 dbm db gain = dbm Figure 9 Plot of Tow-Tone Test, LNA alone Application Note 13 Rev. 1.2,

14 Input Return Loss, Log Mag, LNA alone 25 MHz - 3 GHz Sweep Note wideband design Figure 10 Plot of Input Return Loss, LNA alone Application Note 14 Rev. 1.2,

15 Input Return Loss, Smith Chart, LNA alone Reference Plane = Input SMA Connector on PC Board 25 MHz - 3 GHz Sweep Note wideband design Figure 11 Smith Chart of Input Return Loss, LNA alone Application Note 15 Rev. 1.2,

16 Forward Gain, LNA alone 25 MHz - 3 GHz Sweep Figure 12 Plot of Forward Gain, LNA alone Application Note 16 Rev. 1.2,

17 Reverse Isolation, LNA alone 25 MHz - 3 GHz Figure 13 Plot of Reverse Isolation, LNA alone Application Note 17 Rev. 1.2,

18 Output Return Loss, Log Mag, LNA alone 25 MHz - 3 GHz Sweep Note wideband design Figure 14 Plot of Output Return Loss, LNA alone Application Note 18 Rev. 1.2,

19 Output Return Loss, Smith Chart, LNA alone Reference Plane = Input SMA Connector on PC Board 25 MHz - 3 GHz Sweep Note wideband design Figure 15 Smith Chart of Output Return Loss, LNA alone Application Note 19 Rev. 1.2,

20 Input Return Loss, Log Mag, 434 MHz Bandpass Filter only 25 MHz - 3 GHz Sweep Figure 16 Plot of Input Return Loss, BPF alone Application Note 20 Rev. 1.2,

21 Insertion Loss, 434 MHz Bandpass Filter only 25 MHz - 3 GHz Sweep Note rejection in FM broadcast band & cellular band Figure 17 Plot of Insertion Loss, BPF alone Application Note 21 Rev. 1.2,

22 Output Return Loss, Log Mag, 434 MHz Bandpass Filter only 25 MHz - 3 GHz Sweep Figure 18 Plot of Output Return Loss, BPF alone Application Note 22 Rev. 1.2,

23 Noise Figure, Plot, 384 to 484 MHz, LNA MHz Filter. Center of Plot (x-axis) is 434 MHz. Figure 19 Noise Figure, LNA + BPF Application Note 23 Rev. 1.2,

24 Noise Figure, Tabular Data, LNA MHz Bandpass Filter From Rohde & Schwarz FSEK3 + FSEM30 + System PreAmp (Miteq SMC-02) Table 6 Noise Figure, Cascade Frequency Noise Figure 384 MHz 1.41 db 389 MHz 1.42 db 394 MHz 1.38 db 399 MHz 1.40 db 404 MHz 1.37 db 409 MHz 1.38 db 414 MHz 1.39 db 419 MHz 1.42 db 424 MHz 1.39 db 429 MHz 1.40 db 434 MHz 1.40 db 439 MHz 1.38 db 444 MHz 1.41 db 449 MHz 1.41 db 454 MHz 1.44 db 459 MHz 1.43 db 464 MHz 1.49 db 469 MHz 1.53 db 474 MHz 1.53 db 479 MHz 1.56 db 484 MHz 1.61 db Application Note 24 Rev. 1.2,

25 Input Return Loss, Log Mag, LNA MHz Bandpass Filter 25 MHz - 3 GHz Sweep Figure 20 Plot of Input Return Loss, Cascade Application Note 25 Rev. 1.2,

26 Input Return Loss, Smith Chart, LNA MHz Bandpass Filter Reference Plane = Input SMA Connector on PC Board 25 MHz - 3 GHz Sweep Figure 21 Smith Chart of Input Return Loss, Cascade Application Note 26 Rev. 1.2,

27 Forward Gain, LNA MHz Bandpass Filter 25 MHz - 3 GHz Sweep Figure 22 Plot of Forward Gain, Cascade Application Note 27 Rev. 1.2,

28 Reverse Isolation, LNA MHz Bandpass Filter 25 MHz - 3 GHz Figure 23 Plot of Reverse Isolation, Cascade Application Note 28 Rev. 1.2,

29 Output Return Loss, Log Mag, LNA MHz Bandpass Filter 25 MHz - 3 GHz Sweep Figure 24 Plot of Output Return Loss, Cascade Application Note 29 Rev. 1.2,

30 Output Return Loss, Smith Chart, LNA MHz Bandpass Filter Reference Plane = Input SMA Connector on PC Board 25 MHz - 3 GHz Sweep Figure 25 Smith Chart of Output Return Loss, Cascade Application Note 30 Rev. 1.2,

Application Note No. 143

Application Note, Rev. 1.2, February 2008 Application Note No. 143 A Low-Cost Low Noise Amplifier + Bandpass Filter Rx Front End for Improved-Sensitivity / Enhanced Range 315 and 434 MHz RKE Applications