BFP74ESD Low Noise Amplifier for Wireless LAN 2.4GHz Application Application Note AN295 Revision: Rev. 1. RF and Protection Devices
Edition Published by Infineon Technologies AG 81726 Munich, Germany 213 Infineon Technologies AG All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, 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. Information For further information on technology, delivery terms and conditions and prices, please contact the nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements, components may contain dangerous substances. For information on the types in question, please contact the nearest Infineon Technologies Office. Infineon Technologies components may be used in life-support devices or systems only 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.
BFP74ESD Application Note AN295 Revision History: Previous Revision: None Page Subjects (major changes since last revision) Trademarks of Infineon Technologies AG AURIX, C166, CanPAK, CIPOS, CIPURSE, EconoPACK, CoolMOS, CoolSET, CORECONTROL, CROSSAVE, DAVE, DI-POL, EasyPIM, EconoBRIDGE, EconoDUAL, EconoPIM, EconoPACK, EiceDRIVER, eupec, FCOS, HITFET, HybridPACK, I²RF, ISOFACE, IsoPACK, MIPAQ, ModSTACK, my-d, NovalithIC, OptiMOS, ORIGA, POWERCODE, PRIMARION, PrimePACK, PrimeSTACK, PRO-SIL, PROFET, RASIC, ReverSave, SatRIC, SIEGET, SINDRION, SIPMOS, SmartLEWIS, SOLID FLASH, TEMPFET, thinq!, TRENCHSTOP, TriCore. Other Trademarks Advance Design System (ADS) of Agilent Technologies, AMBA, ARM, MULTI-ICE, KEIL, PRIMECELL, REALVIEW, THUMB, µvision of ARM Limited, UK. AUTOSAR is licensed by AUTOSAR development partnership. Bluetooth of Bluetooth SIG Inc. CAT-iq of DECT Forum. COLOSSUS, FirstGPS of Trimble Navigation Ltd. EMV of EMVCo, LLC (Visa Holdings Inc.). EPCOS of Epcos AG. FLEXGO of Microsoft Corporation. FlexRay is licensed by FlexRay Consortium. HYPERTERMINAL of Hilgraeve Incorporated. IEC of Commission Electrotechnique Internationale. IrDA of Infrared Data Association Corporation. ISO of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB of MathWorks, Inc. MAXIM of Maxim Integrated Products, Inc. MICROTEC, NUCLEUS of Mentor Graphics Corporation. MIPI of MIPI Alliance, Inc. MIPS of MIPS Technologies, Inc., USA. murata of MURATA MANUFACTURING CO., MICROWAVE OFFICE (MWO) of Applied Wave Research Inc., OmniVision of OmniVision Technologies, Inc. Openwave Openwave Systems Inc. RED HAT Red Hat, Inc. RFMD RF Micro Devices, Inc. SIRIUS of Sirius Satellite Radio Inc. SOLARIS of Sun Microsystems, Inc. SPANSION of Spansion LLC Ltd. Symbian of Symbian Software Limited. TAIYO YUDEN of Taiyo Yuden Co. TEAKLITE of CEVA, Inc. TEKTRONIX of Tektronix Inc. TOKO of TOKO KABUSHIKI KAISHA TA. UNIX of X/Open Company Limited. VERILOG, PALLADIUM of Cadence Design Systems, Inc. VLYNQ of Texas Instruments Incorporated. VXWORKS, WIND RIVER of WIND RIVER SYSTEMS, INC. ZETEX of Diodes Zetex Limited. Last Trademarks Update 211-11-11 Application Note AN295, Rev. 1. 3 / 17
Table of Content BFP74ESD List of Content, Figures and Tables 1 Introduction... 5 2 Application Circuit... 6 3 Typical Measurement Results... 8 4 Measured Graphs... 9 5 Other Miscellaneous Measurements... 14 6 Evaluation Board... 15 7 Author... 16 List of Figures Figure 1 Block diagram... 5 Figure 2 BFP74ESD Application Circuit... 6 Figure 3 Narrowband Isertion gain of BFP74ESD for WLAN 2.4GHz Application... 9 Figure 4 Wideband power gain of BFP74ESD for WLAN 2.4GHz Application... 9 Figure 5 Input Matching of BFP74ESD for WLAN 2.4GHz Application... 1 Figure 6 Output Matching of BFP74ESD for WLAN 2.4GHz Application... 1 Figure 7 Reverse Isolation of BFP74ESD for WLAN 2.4GHz Application... 11 Figure 8 Noise Figure of BFP74ESD for WLAN 2.4GHz Application... 11 Figure 9 Input 1 db compression point of BFP74ESD for WLAN 2.4GHz Application... 12 Figure 1 Output Third Order Interpoint (OIP3) of BFP74ESD for WLAN 2.4GHz Application... 12 Figure 11 Input matching of BFP74ESD for WLAN 2.4GHz Application in the Smith Chart... 13 Figure 12 Output matching of BFP74ESD for WLAN 2.4GHz Application in the Smith Chart... 13 Figure 13 Stability factor k of BFP74ESD circuit for up to 1GHz... 14 Figure 14 Stability factor µ1 and µ2 of BFP74ESD circuit for up to 1GHz... 14 Figure 15 Populated PCB picture of BFP74ESD for WLAN 2.4GHz board (Emitter Degeneration Length.4mm)... 15 Figure 16 PCB layer stack... 15 List of Tables Table 1 Bill-of-Materials... 6 Table 2 Package drawing for SOT343 package... 7 Table 3 Electrical Characteristics (at room temperature)... 8 Application Note AN295, Rev. 1. 4 / 17
BFP74ESD Introduction 1 Introduction The BFP74ESD is a SiGe:C transistor manufacturered in the highly reliable SiGe:C technology. It offers 2kV Human Body Model ESD robustness due to the integrated protection circuit, and is capable of working under up to 21dBm RF input power. It offers a low noise figure (minimum value.65db@2.4ghz) and high gain (25.5dB typ.@2.4ghz) for up to 6GHz. In the 2.4GHz ISM frequency band, the international Wireless LAN standards 82.11 b/g/n is among the major applications. When BFP74ESD is used as low noise amplifier for the 2.4GHz Wireless LAN application, it offers a noise figure of.74db only, and provides a high gain of 18.9dB. Rx Diplexer LNA Balun Antenna diversity DPDT BFP74ESD WLAN Transceiver & Baseband Tx Diplexer PA Balun Figure 1 Block diagram Application Note AN295, Rev. 1. 5 / 17
BFP74ESD Application Circuit 2 Application Circuit 2.1 Schematic Diagram V cc = 3. V All passives are 42 case size Inductors: LQG Series Capacitors: various J3 DC Connector I = 11.3 ma R2 R1 12 Ohms J1 RF Port1 INPUT C3 39pF C1 8.2pF L1 2.2nH 22k Ohms Q1: BFP74ESD R3 24 Ohms L2 2.2nH C4 39pF C2 22pF J2 RF Port2 OUTPUT Emitter Degeneration Micro Stripline,.4mm length PCB = M1511 V1.4e PCB Board Material = Standard FR4 Layer spacing (top RF to internal ground plane):.2 mm Total Component Count = 9 Inductors = 2 (LQG Low-Q series) Resistors = 3 Capacitors = 4 Figure 2 BFP74ESD Application Circuit Table 1 Bill-of-Materials Symbol Value Unit Package Manufacturer Comment C1 8.2 pf 42 Various Input matching C2 22 pf 42 Various Output matching C3 39 pf 42 Various RF decoupling / blocking capacitor C4 39 pf 42 Various RF decoupling / blocking capacitor R1 12 Ω 42 Various DC biasing R2 22 kω 42 Various DC biasing R3 24 Ω 42 Various DC biasing L1 2.2 nh 42 Murata LQG15A Input matching L2 2.2 nh 42 Murata LQG15A Output matching Q1 BFP74ESD SOT343 Infineon Transistor LNA in SOT343 package Application Note AN295, Rev. 1. 6 / 17
BFP74ESD Application Circuit Table 2 Package drawing for SOT343 package Application Note AN295, Rev. 1. 7 / 17
BFP74ESD Typical Measurement Results 3 Typical Measurement Results Table 3 shows typical measurement results of the application circuit shown in Figure 2. The values given in these tables include losses of the board and the SMA connectors if not otherwise stated. Table 3 Electrical Characteristics (at room temperature) Parameter Symbol Value Unit Comment/Test Condition Frequency Range Freq 244 MHz DC Voltage Vcc 3. V DC Current Icc 11.3 ma Gain G 18.9 db Noise Figure NF.74 db Input Return Loss RLin 1.4 db PCB and SMA connector losses of.11 db subtracted Output Return Loss RLout 11. db Reverse Isolation IRev 26.2 db Input P1dB IP1dB -12.9 dbm Output P1dB OP1dB 5. dbm Input IP3 IIP3-4.9 dbm Ouput IP3 OIP3 + 14. dbm Stability K > 1 -- f 1 = 244 MHz, f 2 = 2441MHz, Pin = -25 dbm f 1 = 244 MHz, f 2 = 2441MHz, Pin = -25 dbm Unconditionally stable from to 1GHz Application Note AN295, Rev. 1. 8 / 17
BFP74ESD Measured Graphs 4 Measured Graphs 25 Insertion Power Gain 2 15 24 MHz 19 db 244 MHz 18.9 db 25 MHz 18.8 db 1 5 21 24 27 Figure 3 Narrowband Isertion gain of BFP74ESD for WLAN 2.4GHz Application 25 Insertion Power Gain WideBand 2 15 244 MHz 18.9 db 1 5 1 6 11 16 21 26 31 36 41 46 51 566 Figure 4 Wideband power gain of BFP74ESD for WLAN 2.4GHz Application Application Note AN295, Rev. 1. 9 / 17
BFP74ESD Measured Graphs Input Matching -5 244 MHz -1.3 db -1-15 2 4 6 Figure 5 Input Matching of BFP74ESD for WLAN 2.4GHz Application Output Matching -5-1 244 MHz -11 db -15-2 2 4 6 Figure 6 Output Matching of BFP74ESD for WLAN 2.4GHz Application Application Note AN295, Rev. 1. 1 / 17
NF(dB) BFP74ESD Measured Graphs -2 Reverse Isolation -25-3 -35 244 MHz -26.1 db -4-45 -5 2 4 6 Figure 7 Reverse Isolation of BFP74ESD for WLAN 2.4GHz Application 1 Noise Figure.8.6.4 244 MHz.74.2 23 235 24 245 25 Figure 8 Noise Figure of BFP74ESD for WLAN 2.4GHz Application Application Note AN295, Rev. 1. 11 / 17
Power (dbm) Gain(dB) BFP74ESD Measured Graphs 2 Input 1dB Compression Point at 244MHz 15 1-2. 18.6-12.9 17.6 5-2 -15-1 -5 Pin [dbm] Figure 9 Input 1 db compression point of BFP74ESD for WLAN 2.4GHz Application Output 3rd Order Intercept Point 244MHz -2-4 2439 MHz -46.4 244 MHz -6.2-6 -8-1 2438.5 2439.5 244.5 2441.5 2442.5 Figure 1 Output Third Order Interpoint (OIP3) of BFP74ESD for WLAN 2.4GHz Application Application Note AN295, Rev. 1. 12 / 17
BFP74ESD Measured Graphs 1. 1. -1..2.4.6.8 2. 3. 4. 5. 1. -1..2.4.6.8 2. 3. 4. 5. 1..6 Input Matching Smith.8 Swp Max 27MHz 2..4 3..2 4. 5. 1. -1. -.2-5. -4. -.4-3. -2. -.6 -.8 Swp Min 21MHz Figure 11 Input matching of BFP74ESD for WLAN 2.4GHz Application in the Smith Chart.6 Output Matching Smith.8 1. 1. Swp Max 27MHz 2..4 3..2 4. 5. 1. -1. -.2-5. -4. -.4-3. -2. -.6 -.8 Swp Min 21MHz Figure 12 Output matching of BFP74ESD for WLAN 2.4GHz Application in the Smith Chart Application Note AN295, Rev. 1. 13 / 17
5 Other Miscellaneous Measurements BFP74ESD Other Miscellaneous Measurements 2 Stability k Factor 1.5 7134.1 MHz 1.15 1.5 1 51 11 15 Figure 13 Stability factor k of BFP74ESD circuit for up to 1GHz 2 Stability Mu Factor 1.5 47.462 MHz 1.6 1 7134.1 MHz 1.13.5 MU1() MU2() 1 21 41 61 81 1 Figure 14 Stability factor µ1 and µ2 of BFP74ESD circuit for up to 1GHz Application Note AN295, Rev. 1. 14 / 17
BFP74ESD Evaluation Board 6 Evaluation Board Figure 15 Populated PCB picture of BFP74ESD for WLAN 2.4GHz board (Emitter Degeneration Length.4mm) Vias FR4,.2mm Copper 35µm FR4,.8mm Figure 16 PCB layer stack Application Note AN295, Rev. 1. 15 / 17
7 Author BFP74ESD Author Xiang Li, Application Engineer of Business Unit RF and Protection Devices Dr. Chih-I Lin, Senior Staff Engineer of Business Unit RF and Protection Devices Application Note AN295, Rev. 1. 16 / 17
w w w. i n f i n e o n. c o m Published by Infineon Technologies AG AN295