A pp li c at io n N o t e, R e v . 1. 2 , N ov e m be r 2 00 7 A p p li c a t i o n N o t e N o . 1 2 5 L N A f or S at e l l i t e D i g i t al M u l t i m ed i a B r o a d c a s ti n g A p pl i c a t i o n s us i n g B F P 6 4 0 F S i G e T r an s i s t o r R F & P r o t e c ti o n D e v i c e s Edition 2007-11-19 Published by Infineon Technologies AG 81726 München, Germany © Infineon Technologies AG 2009. 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. 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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. Application Note No. 125 Application Note No. 125 Revision History: 2007-11-19, Rev. 1.2 Previous Version: 2004-09-08, Rev. 1.1 Page Subjects (major changes since last revision) All Small changes in figure descriptions Application Note 3 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using 1 LNA for Satellite Digital Multimedia Broadcasting Applications using BFP640F SiGe Transistor Overview • • • • • BFP640F is investigated for use as an LNA for a 2630 - 2655 MHz Digital Multimedia Broadcasting ("DMB") application. Design Goals: Gain =15 dB, Noise Figure < 1.2 dB, Input / Output Return Loss 10 dB or better, current < 10 mA from a 1.8 V power supply, Output P1dB > -5 dBm Printed Circuit Board used is Infineon Part Number 640F-021904 Rev A. Standard FR4 material is used in a three-layer PCB. Please refer to cross-sectional diagram. Low-cost, standard "0402" case-size SMT passive components are used throughout. Please refer to Schematic and Bill of Material. The LNA is unconditionally stable from 5 MHz to 6 GHz. Total PCB area used for the single LNA stage is approximately 35 mm². Total Parts count, including the BFP640F transistor, is 12. Achieved ≅ 14 dB gain, 0.9 dB Noise Figure from 2400-2800 MHz from a 1.8 V supply, drawing 6.8 mA. Outstanding Input 3rd Order Intercept of +10.5 dBm. Note noise figure result does NOT "back out" FR4 PCB losses - if the PCB loss at LNA input were extracted, Noise Figure result would be approximately 0.2 dB lower. Amplifier is unconditionally stable from 5 MHz to 6 GHz. PCB Cross - Section Diagram 7+,663$&,1*&5,7,&$/ 723/$<(5 LQFKPP ,17(51$/*5281'3/$1( LQFKPP" /$<(5)250(&+$1,&$/5,*,',7<2)3&%7+,&.1(66+(5(127 &5,7,&$/$6/21*$6727$/3&%7+,&.1(66'2(6127(;&((' ,1&+PP63(&,),&$7,21)25727$/3&%7+,&.1(66 ,1&+PPPP %27720/$<(5 $1B3&%YVG Figure 1 PCB - Cross Sectional Diagram Application Note 4 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using TSFP-4 Package Details (dimensions in millimeters) Note maximum package height is 0.59 mm / 0.023 inch. 0.2 ±0.05 3 1 1.2 ±0.05 0.2 ±0.05 4 0.55 ±0.04 2 0.2 ±0.05 10˚ MAX. 0.8 ±0.05 1.4 ±0.05 0.15 ±0.05 0.5 ±0.05 0.5 ±0.05 Figure 2 GPX01010 Package Details of TSFP-4 Recommended Soldering Footprint for TSFP-4 (dimensions in millimeters). Device package is to be oriented as shown in above drawing (e.g. orient long package dimension horizontally on this footprint). 0.9 0.45 0.35 0.5 0.5 HLGF1011 Figure 3 Package Footprint of TSFP-4 Application Note 5 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Summary of LNA Data T = 25 °C, network analyzer source power = -25 dBm Table 1 Summary of LNA Data Parameter Result Frequency Range 2630 - 2655 MHz (can go wider) DC Current 6.8 mA DC Voltage, VCC 1.8 V Collector-Emitter Voltage, VCE 1.5 V Gain 14.2 dB @ 2630 MHz 14.2 dB @ 2642.5 MHz 14.1 dB @ 2655 MHz Noise Figure 0.9 dB @ 2630 MHz 0.9 dB @ 2642.5 MHz 0.9 dB @ 2655 MHz See noise figure plot and tabular data, pages 6 and 7. (These values do NOT extract PCB losses, etc. resulting from FR4 board and passives used on PCB - these results are at input SMA connector) Input P1dB -9.3 dBm @ 2640 MHz See input power sweep vs. gain plot on page 11. Output P1dB +3.9 dBm @ 2640 MHz rd Comments BFP640: VCEmax = 4.0 V Input 3 Order Intercept +10.5 dBm @ 2642.5 MHz Output 3rd Order Intercept +24.7 dBm @ 2642.5 MHz Input Return Loss 12.8 dB @ 2630 MHz 12.9 dB @ 2642.5 MHz 13.0 dB @ 2655 MHz Output Return Loss 13.6 dB @ 2630 MHz 13.4 dB @ 2642.5 MHz 13.2 dB @ 2655 MHz Reverse Isolation 19.7 dB @ 2630 MHz 19.7 dB @ 2642.5 MHz 19.6 dB @ 2655 MHz Application Note 6 (For Test: Two tones, f1=2642 MHz, f2=2643 MHz, -18 dBm each tone). See plot on pages 16 - 17 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Bill of Material Table 2 Bill of Material REFERENCE DESIGNATOR VALUE MANUFACTURER CASE SIZE FUNCTION C1 8.2 pF Various 0402 DC Blocking, Input. C2 1.5 pF Various 0402 DC Block, Output. Also Influences Output and Input Impedance Match C3 0.1 µF Various 0402 Decoupling, Low Frequency. Also improves Third-Order Interception C4 8.2 pF Various 0402 Decoupling (RF Short) C5 5.6 pF Various 0402 Decoupling (RF Short). Also has influence on stability. C6 0.1 µF Various 0402 Decoupling, Low Frequency L1 10 nH Murata LQG15H Series Low Cost Inductor 0402 RF Choke at Input L2 3.6 nH Murata LQP15M Series Inductor 0402 RF Choke + Impedance Match at Output R1 10 Ω Various 0402 Stability Improvement R2 20 kΩ Various 0402 Brings Bias Current / Voltage into Base of Transistor R3 30 Ω Various 0402 Provides some Negative Feedback for DC BIAS / DC Operation Point to Compensate for Variations in Transistor DC Current Gain, Temperature Variations, etc. Q1 - Infineon Technologies TSFP-4 BFP640F B7HF SiGe Transistor J1, J2 - Johnson 142-0701-841 - RF Input / Output Connectors J3 - AMP 5 Pin Header MTA-100 Series 640456-5 (standard pin plating) or 641215-5 (gold plated pins) Application Note 7 DC Connector Pins 1,5 = GROUND Pin 3 = VCC Pins 2,4 = no connection Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Schematic Diagram for 2.6 GHz BFP640F LNA 9FF 9 - '&&RQQHFWRU , P$ 5 RKPV 5 . & X) %ODFNUHFWDQJOHVDUHRKP PLFURVWULSWUDFNVQRWFKLS FRPSRQHQWV & X) & S) / Q+ 5 RKPV 4 %)3)6L*H 7UDQVLVWRU / Q+ & S) & S) - 5)287387 RKPPLFURVWULS - 5),1387 & S) 3&% )5HY$ 3&%RDUG0DWHULDO 6WDQGDUG)5 ,QGXFWLYH(PLWWHU'HJHQHUDWLRQ0LFURVWULS IRU,3 LPSURYHPHQW5)PDWFKLQJ :LGWK LQFKPP /HQJWK LQFKPP Figure 4 $1B6FKHPDWLFYVG Schematic Diagram Application Note 8 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Noise Figure, Plot. Center of Plot (x-axis) is 2642.5 MHz. 5RKGH6FKZDU])6(. 6HS %)3)76)33DFNDJH/1$1RLVH)LJXUH (871DPH 0DQXIDFWXUHU 2SHUDWLQJ&RQGLWLRQV 2SHUDWRU1DPH 7HVW6SHFLILFDWLRQ &RPPHQW 3&% )5HY$ ,QILQHRQ7HFKQRORJLHV6LOLFRQ'LVFUHWHV*URXS*) 9FF 9,F P$ *HUDUG:HYHUV *+]'0%+$SSOLFDWLRQ$3$& 9FH YROWV $QDO\]HU 5)$WW 5HI/YO G% G%P 5%: 9%: 0+] +] 5DQJH G% 5HI/YODXWR 21 0RGH 'LUHFW (15 +3$(15 0HDVXUHPHQW QGVWDJHFRUU 21 1RLVH)LJXUHG% 0+] 0+]',9 0+] $1BQIYVG Figure 5 Noise Figure Application Note 9 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Noise Figure, Tabular Data From Rhode & Schwarz FSEK3 + FSEM30 System Preamplifier = MITEQ SMC-02 Table 3 Noise Figure Frequency Noise Figure 2392.5 MHz 0.86 dB 2417.5 MHz 0.86 dB 2442.5 MHz 0.85 dB 2467.5 MHz 0.89 dB 2492.5 MHz 0.87 dB 2517.5 MHz 0.90 dB 2542.5 MHz 0.87 dB 2567.5 MHz 0.88 dB 2592.5 MHz 0.86 dB 2617.5 MHz 0.91 dB 2642.5 MHz 0.88 dB 2667.5 MHz 0.88 dB 2692.5 MHz 0.88 dB 2717.5 MHz 0.90 dB 2742.5 MHz 0.90 dB 2767.5 MHz 0.90 dB 2792.5 MHz 0.93 dB 2817.5 MHz 0.89 dB 2842.5 MHz 0.92 dB 2867.5 MHz 0.90 dB 2892.5 MHz 0.91 dB Application Note 10 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Scanned Image of PC Board Figure 6 Image of PC Board Application Note 11 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Scanned Image of PC Board, Close-In Shot Figure 7 Image of PC Board, Close-In Shot Application Note 12 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Stability Factor "K" and Stability Measure "B1” Note that K > 1 and B1 > 0, the amplifier is unconditionally stable. Measured LNA s-parameters were taken on a Network Analyzer & then imported into GENESYS simulation package, which calculates and plots K and B1. Figure 8 Plot of K(f) and B1(f) Application Note 13 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Power Sweep at 2640 MHz (CW) Source Power (Input) swept from -35 to -7 dBm Input P1dB ≅ -9.3 dBm &+ 6 ORJ0$* G% 5()G% 6HS BG% G%P 35P BG% G%P &RU 'HO 6PR 67$57G%P &:0+] 6723G%P $1BSORWBSRZHUBVZHHSYVG Figure 9 Plot of Power Sweep (@ 2640 MHz) Application Note 14 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Input Return Loss, Log Mag, Wide Sweep 5 MHz - 6 GHz &+ 6 ORJ0$* G% 5()G% 6HS BG% 0+] 35P &RU 'HO BG% *+] 6&$/( G%GLY BG% *+] 67$570+] 67230+] $1BSORWBLQSXWBUHWXUQBORVVYVG Figure 10 Plot of Input Return Loss, Wide Sweep Application Note 15 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Forward Gain, Wide Sweep 5 MHz - 6 GHz &+ 6 ORJ0$* G% 5()G% 6HS BG% 0+] 35P &RU 'HO BG% *+] 6&$/( G%GLY BG% *+] 67$570+] 67230+] $1BSORWBIZBJDLQYVG Figure 11 Plot of Forward Gain Application Note 16 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Reverse Isolation, Wide Sweep 5 MHz - 6 GHz &+ 6 ORJ0$* G% 5()G% 6HS BG% 0+] 35P &RU 'HO BG% *+] 6&$/( G%GLY BG% *+] 67$570+] 67230+] $1BSORWBUHYHUVHBLVRODWLRQYVG Figure 12 Plot of Reverse Isolation Application Note 17 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Output Return Loss, Log Mag, Wide Sweep 5 MHz - 6 GHz &+ 6 ORJ0$* G% 5()G% 6HS BG% 0+] 35P &RU 'HO BG% *+] 6&$/( G%GLY BG% *+] 67$570+] 67230+] $1BSORWBRXWSXWBUHWXUQBORVVYVG Figure 13 Plot of Output Return Loss Application Note 18 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using Input Stimulus for Amplifier Two-Tone Test f1 = 2642 MHz, f2 = 2643 MHz, -18 dBm each tone. $1BSORWBWZRBWRQHBLQSXWYVG Figure 14 Tow-Tone Test, Input Stimulus Application Note 19 Rev. 1.2, 2007-11-19 Application Note No. 125 LNA for Satellite Digital Multimedia Broadcasting Applications using LNA Response to Two-Tone Test Input IP3 = -18 + (56.9/2) = +10.5 dBm Output IP3 = +10.5 dBm + 14.2 dB gain = + 24.7 dBm $1BSORWBWZRBWRQHBUHVSRQVHYVG Figure 15 Tow-Tone Test, LNA Response Application Note 20 Rev. 1.2, 2007-11-19