BF P760 High Gain and Hi gh Linea rit y Low Nois e A mplifier fo r 2.4 G Hz WLA N with On - of f Mod e De lta Gai n 2 8 d B Applic atio n N ote A N 324 Revision: Rev.1.0 2013-03-06 RF and P r otecti on D evic es Edition 2013-03-06 Published by Infineon Technologies AG 81726 Munich, Germany © 2013 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. BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Note AN324 Revision History: 2013-03-06 Previous Revision: 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 2011-11-11 Application Note AN324, Rev.1.0 3 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass List of Content, Figures and Tables Table of Content ® 1 About Wireless Fidelity (Wi-Fi ) / Wireless LAN (WLAN) ............................................................... 5 2 2.1 2.2 2.3 BFP760 Overview ............................................................................................................................... 7 Features ............................................................................................................................................... 7 Key Applications of BFP760 ................................................................................................................. 7 Description ........................................................................................................................................... 8 3 Application Circuit and Performance Overview .............................................................................. 9 3.1 Summary of Measurement Results ...................................................................................................... 9 3.2 BFP760 as Low Noise Amplifier for 2.4 GHz WLAN.......................................................................... 11 3.3 Schematics and Bill-of-Materials ........................................................................................................ 12 Measurement Graphs ............................................................................................................................................ 13 4 Evaluation Board and Layout Information .................................................................................... 22 5 Authors .............................................................................................................................................. 24 6 Remark .............................................................................................................................................. 24 List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 ® 2.4 GHz Wi-Fi Wireless LAN (WLAN, IEEE802.11b/g/n/a/c/ac) Front-End ...................................... 5 BFP760 in SOT343 .............................................................................................................................. 7 Package and pin definations of BFP760 .............................................................................................. 8 Schematics of the BFP760 Application Circuit ................................................................................... 12 Insertion Power Gain of the 2.4 GHz WLAN LNA with BFP760 ........................................................ 13 Wideband Insertion Power Gain of the 2.4 GHz WLAN LNA with BFP760 ....................................... 13 Noise Figure of BFP760 LNA for 2.4 - 2.5 GHz ................................................................................. 14 Reverse Isolation of the 2.4 GHz WLAN LNA with BFP760 .............................................................. 14 Input Matching of the 2.4 GHz WLAN LNA with BFP760 .................................................................. 15 Input Matching of 2.4 GHz WLAN LNA with BFP760 (Smith Chart) .................................................. 15 Output Matching of the 2.4 GHz WLAN LNA with BFP760 ............................................................... 16 Output Matching of the 2.4 GHz WLAN LNA with BFP760 (Smith Chart) ......................................... 16 Wideband Stability k Factor of the 2.4 GHz WLAN LNA with BFP760 .............................................. 17 Wideband Stability Mu Factor of the 2.4 GHz WLAN LNA with BFP760 ........................................... 17 Input 1dB Compression Point of the BFP760 Circuit ......................................................................... 18 rd Output 3 Order Intercept Point of BFP760 at 2440 MHz ................................................................. 18 Off mode Insertion Power Gain of the 2.4 GHz WLAN LNA with BFP760 ........................................ 19 Off mode Input Matching of the 2.4 GHz WLAN LNA with BFP760 .................................................. 19 Off mode input matching of 2.4 GHz WLAN LNA with BFP760 (Smith Chart) .................................. 20 Off mode Output Matching of the 2.4 GHz WLAN LNA with BFP760 ................................................ 20 Off mode output Matching of 2.4 GHz WLAN LNA with BFP760 (Smith Chart) ................................ 21 Off mode input 1dB compression point of the 2.4 GHz WLAN LNA with BFP760 ............................ 21 Photo Picture of Evaluation Board (overview) <PCB Marking Myymmdd Rev. x.x> ......................... 22 Photo Picture of Evaluation Board (detailed view) ............................................................................. 22 Layout Proposal for RF Grounding of the 2.4 GHz WLAN LNA with BFP760 ................................... 23 PCB Layer Information ....................................................................................................................... 23 List of Tables Table 1 Table 2 Table 3 Table 4 Pin Assignment of BFP760 .................................................................................................................. 8 On-Mode Electrical Characteristics (at room temperature).................................................................. 9 Off-Mode Electrical Characteristics (at room temperature)................................................................ 10 Bill-of-Materials................................................................................................................................... 12 Application Note AN324, Rev.1.0 4 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass About Wireless Fidelity (Wi-Fi®) / Wireless LAN (WLAN) 1 About Wireless Fidelity (Wi-Fi®) / Wireless LAN (WLAN) Wireless Fidelity (Wi-Fi®) or well-known as wireless LAN (WLAN) plays a major role in today’s communications by enabling constant connection in the 2.4 GHz and broadband Internet access for users with laptops or devices equipped with wireless network interface while roaming within the range of fixed access points (AP) or a public hotspot. Different applications like home entertainment with wireless high-quality multimedia signal transmission, home networking notebooks, mass data storages and printers implement 2.4 GHz into their system for wireless connectivity. For this kind of high-speed high data rate wireless communication standards it is essential to ensure the quality of the link path. Major performance criteria of these equipments have to be fulfilled: sensitivity, strong signal capability and interference immunity. Below a general application diagram of a WLAN system is shown. Figure 1 ® 2.4 GHz Wi-Fi Wireless LAN (WLAN, IEEE802.11b/g/n/a/c/ac) Front-End In order to increase the system sensitivity, an excellent low noise amplifier (LNA) in front of the receiver is mandatory, especially in an environment with very weak signal strength and because of the insertion loss of the single-pole-double-throw (SPDT) switch and the Bandpass Filter (BPF) or diplexer. The typical allowed receiver chain Noise Figure (NF) of approx. 2 dB can only be achieved by using a high-gain low noise amplifier (LNA). Application Note AN324, Rev.1.0 5 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass About Wireless Fidelity (Wi-Fi®) / Wireless LAN (WLAN) In addition, strong signal environment can exist when the equipment is next to a transmitter. In that case, the LNA must be linear enough, i.e. have high 1dB compression point. This avoids saturation, degradation of the gain and increased noise figure. This application note is focusing on the LNA block, but Infineon does also support with RFswitches, TVS-diodes for ESD protection and RF Schottky diodes for power detection. - Application Note AN324, Rev.1.0 6 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass BFP760 Overview 2 BFP760 Overview 2.1 Features Very low noise amplifier based on Infineon´s reliable, high volume SiGe:C technology. High linearity OIP3 = 27 dBm @ 5.5 GHz, 3 V, 30 mA. High transition frequency fT = 45 GHz @ 1 GHz, 3 V, 35mA. NFmin = 0.95 dB @ 5.5 GHz, 3 V, 10 mA, Transducer gain |S21|2 = 16 dB @ 3.5 GHz, 3 V, 10 mA. Low power consumption, ideal for mobile applications. Easy to use Pb-free (RoHS compliant) and halogen-free standard package with visible leads Qualification report according to AEC-Q101 available. 2.2 Figure 2 BFP760 in SOT343 Key Applications of BFP760 As Low Noise Amplifier (LNA) in Mobile and fixed connectivity applications: WLAN 802.11a/b/c/g/n, WiMAX 2.5/3.5 GHz, Bluetooth Satellite communication systems: Navigation systems (GPS, Glonass), satellite radio (SDARs, DAB) and C-band LNB Multimedia applications such as mobile/portable TV, CATV, FM Radio UMTS/LTE mobile phone applications ISM applications like RKE, AMR and Zigbee, as well as for emerging wireless applications As discrete active mixer, buffer amplifier in VCOs Application Note AN324, Rev.1.0 7 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass BFP760 Overview 2.3 Description The BFP760 is a linear low noise wideband NPN bipolar RF transistor. The device is based on Infineon’s reliable high volume silicon germanium carbon (SiGe:C) heterojunction bipolar technology. The collector design supports voltages up to VCEO = 4.0 V and currents up to IC = 70 mA. With its high linearity at currents as low as 10 mA the device supports energy efficient designs. The typical transit frequency is approximately 45 GHz. The device is housed in an easy to use plastic SOT-343 package with visible leads. B 1 4 E XYs E 2 3 C BFP760 Figure 3 Table 1 Package and pin definations of BFP760 Pin Assignment of BFP760 Pin No. Symbol Function 1 B Transitor base 2 E Transitor emitter 3 C Transitor collector 4 E Transitor emitter Application Note AN324, Rev.1.0 8 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview 3 Application Circuit and Performance Overview Device: BFP760 Application: Low Noise Amplifier for 2.4 GHz WLAN with bypass PCB Marking: M130125 V1.4e 3.1 Summary of Measurement Results Table 2 On-Mode Electrical Characteristics (at room temperature) Parameter Symbol Value Unit Comment/Test Condition Frequency Range Freq 2.4-2.5 DC Voltage Vcc 3.0 V DC Current Icc 14.6 mA Gain (on mode) Gon 16.8 dB Noise Figure NF 0.93 dB RLin 14 dB RLout 13 dB IRev 24.4 dB Input P1dB (On mode) IP1dBon -10.1 dBm Output P1dB(On mode) OP1dBon 5.7 dBm Input IP3 IIP3 0.9 dBm Power @ Input: -30 dBm f1= 2440 MHz, f2= 2441 MHz Output IP3 OIP3 17 dBm Power @ Input: -30 dBm f1= 2440 MHz, f2= 2441 MHz k ≥ 1.0 -- Input Return Loss Output Return Loss Reverse Isolation Stability Application Note AN324, Rev.1.0 GHz 9 / 25 SMA and PCB losses (~0.1 dB) are subtracted Stability measured from 10MHz to 15GHz 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Table 3 Off-Mode Electrical Characteristics (at room temperature) Parameter Symbol Value Unit Frequency Range Freq 2.4-2.5 DC Voltage Vcc 3.0 V DC Current Icc 60 uA Gain (on mode) Gon -11.5 dB Noise Figure NF 11.5 dB RLin 19 dB RLout 6.8 dB IRev 11.5 dB IP1dBoff >10 dBm Input Return Loss Output Return Loss Reverse Isolation Input P1dB (Off mode) Stability Application Note AN324, Rev.1.0 k Comment/Test Condition GHz -- 10 / 25 SMA and PCB losses (~0.1 dB) are subtracted Stability measured from 10MHz to 15GHz 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview 3.2 BFP760 as Low Noise Amplifier for 2.4 GHz WLAN This application note presents the high gain low noise amplifier with novel bypass solution, using BFP760 for 2.4 GHz WLAN applications. The circuit requires only ten 0402 passive components. It has in band gain of 16.8dB. The circuit achieves an input and output return loss more than 13 dB. The noise figure is about 0.93 dB (SMA and PCB losses are subtracted) for the whole frequency band. Furthermore, the circuit is unconditionally stable till 15 GHz. At 2440 MHz, using two tones spacing of 1 MHz, the output third order intercept point OIP3 reaches 16.5 dBm. Input 1dB compression point IP1dB of -10.1 dBm. The off mode gain is about -11.5 dB. The input P1dB compression in the off-mode for the whole frequency range is more than 10 dBm. In Off-mode this circuit shows good performance with On-Off mode delta gain 28dB. This circuit has an input matching of 19dB and output matching of 6.8dB in off mode condition. Input P1dB is more than 10dBm for the whole frequency band in off mode condiotion. Application Note AN324, Rev.1.0 11 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview 3.3 Schematics and Bill-of-Materials Vbypass= 0 V (on mode) Vbypass = 1.8 V (off mode) Vcc = 3.0 V (on mode) Vcc = 0 V (off mode) J3 DC Connector All passives are “0402“ case size L1 & L2: LQG Series Capacitors: various I = 14.6 mA R3 30 Ω C2 39 pF R5 18 kΩ J1 RF Port1 INPUT R1 18 kΩ R2 82 Ω Q1 BFP760 C1 R4 2.2 Ω L2 2.7 nH C3 1.8 pF J2 RF Port2 OUTPUT 1.8 pF L1 2 nH A proper RF grounding is required to ensure the LNA performance. Please refer to Chapter 4 for the layout proposal. Total Component Count = 10 Including BFP760 transistor PCB = M100511 0.4 mm EDG BFP760 PCB Board Material = FR4 Layer spacing (top RF to internal ground plane): 0.2 mm Figure 4 Table 4 Symbol Inductors = 2 (LQG series) Resistors = 5 Capacitors = 3 Schematics of the BFP760 Application Circuit Bill-of-Materials Value Unit Size Manufacturer Comment C1 1.8 pF 0402 Various Input DC block & input matching C2 39 pF 0402 Various RF decoupling / blocking cap C3 1.8 pF 0402 Various L1 2 nH 0402 Murata LQG series Output DC block & output matching Input matching L2 2.7 nH 0402 Murata LQG series Output matching R1 33 kΩ 0402 Various DC biasing R2 82 Ω 0402 Various Stability improvement R3 30 Ω 0402 Various R4 2.2 Ω 0402 Various DC biasing (provides DC negative feedback to stabilize DC operating point over temperature variation, transistor hFE variation, etc.) Stability improvement and output matching R4 18 kΩ 0402 Various Q1 Application Note AN324, Rev.1.0 SOT343 Bypass mode DC biasing Infineon Technologies BFP760 SiGe: C Heterojunction Bipolar RF Transistor 12 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Measurement Graphs Insertion Power Gain In Band 18 2.45 GHz 16.64 dB 17 16 2.40 GHz 16.84 dB 15 2.50 GHz 16.41 dB 14 13 12 2 Figure 5 2.2 2.4 2.6 Frequency (GHz) 2.8 3 Insertion Power Gain of the 2.4 GHz WLAN LNA with BFP760 Insertion Power Gain WideBand 20 2.45 GHz 16.64 dB 10 2.40 GHz 16.84 dB 2.50 GHz 16.41 dB 0 -10 -20 0.1 Figure 6 2.1 4.1 Frequency (GHz) 6.1 8 Wideband Insertion Power Gain of the 2.4 GHz WLAN LNA with BFP760 Application Note AN324, Rev.1.0 13 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Noise Figure 1 0.96 2.5 GHz 0.91 dB 2.4 GHz 0.93 dB 0.92 0.88 2.45 GHz 0.93 dB 0.84 0.8 2.4 Figure 7 2.42 2.44 2.46 Frequency (GHz) 2.48 2.5 Noise Figure of BFP760 LNA for 2.4 - 2.5 GHz Reverse Isolation -10 -15 2.45 GHz -24.39 dB -20 -25 2.40 GHz -24.45 dB -30 2.50 GHz -24.38 dB -35 -40 2 Figure 8 2.2 2.4 2.6 Frequency (GHz) 2.8 3 Reverse Isolation of the 2.4 GHz WLAN LNA with BFP760 Application Note AN324, Rev.1.0 14 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Input Matching 0 -5 2.40 GHz -14.64 dB -10 2.50 GHz -12.99 dB -15 2.45 GHz -14.03 dB -20 2 Figure 9 2.2 2.4 2.6 Frequency (GHz) 2.8 3 Input Matching of the 2.4 GHz WLAN LNA with BFP760 Swp Max 3GHz 2. 0 6 0. 0.8 1.0 Input Matching Smith Chart 0. 4 0 3. 0 4. 5.0 2 -0. .0 -2 -1.0 -0.8 -0 .6 -3 .0 Figure 10 -4 .0 -5. 0 2.50 GHz r 0.93 x -0.44 .4 -0 10.0 2.40 GHz r 1.25 x -0.34 5.0 4.0 3.0 2.0 1.0 0.8 0.6 0.4 0 10.0 -10.0 0.2 0.2 2.45 GHz r 1.08 x -0.41 Swp Min 2GHz Input Matching of 2.4 GHz WLAN LNA with BFP760 (Smith Chart) Application Note AN324, Rev.1.0 15 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Output Matching 0 -5 2.5 GHz -12.07 dB 2.4 GHz -13.88 dB -10 -15 2.45 GHz -13.03 dB -20 2 Figure 11 2.2 2.4 2.6 Frequency (GHz) 2.8 3 Output Matching of the 2.4 GHz WLAN LNA with BFP760 Swp Max 3GHz 2. 0 6 0. 0.8 1.0 Output Matching Smith Chart 2.50 GHz r 0.84 x 0.44 0. 4 2.40 GHz r 0.75 x 0.25 0 3. 0 4. 5.0 0.2 10.0 5.0 4.0 3.0 2.0 1.0 0.8 0.6 0.4 0 0.2 10.0 2.45 GHz r 0.79 x 0.35 -10.0 2 -0. 4 .0 -5. 0 -3 .0 Figure 12 .0 -2 -1.0 -0.8 -0 .6 .4 -0 Swp Min 2GHz Output Matching of the 2.4 GHz WLAN LNA with BFP760 (Smith Chart) Application Note AN324, Rev.1.0 16 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Stability k factor 5 4 3 2.034 GHz 1.269 2 1 0 0.1 5.1 10.1 15 Frequency (GHz) Figure 13 Wideband Stability k Factor of the 2.4 GHz WLAN LNA with BFP760 Stability Mu factor 3 Mu1 factor Mu2 factor 2.5 2 1.5 1 8.76 GHz 1.07 0.10 GHz 1.00 0.5 0 0.1 5.1 10.1 15 Frequency (GHz) Figure 14 Wideband Stability Mu Factor of the 2.4 GHz WLAN LNA with BFP760 Application Note AN324, Rev.1.0 17 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Input P1dB Compression Point 20 -30 dBm 16.86 dB 18 -10.15 dBm 15.86 dB Gain [dB] 16 14 12 10 8 6 -30 Figure 15 -25 -20 -15 -10 Input Power [dBm] -5 -0.075 Input 1dB Compression Point of the BFP760 Circuit Output 3rd Order Intercept Point 0 2.441 GHz -13.71 2.44 GHz -13.7 -50 2.442 GHz -76.02 2.439 GHz -75.48 -100 -150 2.438 Figure 16 2.439 2.44 2.441 Frequency (GHz) 2.442 2.443 rd Output 3 Order Intercept Point of BFP760 at 2440 MHz Application Note AN324, Rev.1.0 18 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Off Mode Insertion Power Gain -5 2.5 GHz -11.69 dB 2.4 GHz -11.42 dB -10 2.45 GHz -11.54 dB -15 -20 -25 2 Figure 17 2.2 2.4 2.6 Frequency (GHz) 2.8 3 Off mode Insertion Power Gain of the 2.4 GHz WLAN LNA with BFP760 Off Mode Input Matching 0 -5 2.40 GHz -19.58 dB -10 2.45 GHz -19.07 dB 2.50 GHz -17.63 dB -15 -20 2 Figure 18 2.2 2.4 2.6 Frequency (GHz) 2.8 3 Off mode Input Matching of the 2.4 GHz WLAN LNA with BFP760 Application Note AN324, Rev.1.0 19 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Swp Max 3GHz 2. 0 6 0. 0.8 1.0 Off Mode Input Matching Smith Chart 0. 4 0 3. 10.0 2.45 GHz r 1.10 x -0.21 2 -0. 4 .0 -5. 0 -3 .0 .0 -2 -1.0 -0.8 -0 .6 .4 -0 Figure 19 5.0 4.0 3.0 2.0 10.0 1.0 0.8 0.6 0.4 0.2 5.0 -10.0 0.2 2.50 GHz r 1.00 x -0.27 0 0 4. 2.40 GHz r 1.19 x -0.13 Swp Min 2GHz Off mode input matching of 2.4 GHz WLAN LNA with BFP760 (Smith Chart) Off Mode Output Matching 5 0 2.40 GHz -7.12 dB -5 2.50 GHz -6.43 dB 2.45 GHz -6.76 dB -10 -15 2 Figure 20 2.2 2.4 2.6 Frequency (GHz) 2.8 3 Off mode Output Matching of the 2.4 GHz WLAN LNA with BFP760 Application Note AN324, Rev.1.0 20 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Application Circuit and Performance Overview Swp Max 3GHz 2. 0 6 0. 0.8 1.0 Off Mode Output Matching Smith Chart 2.40 GHz r 1.44 x 1.09 2.50 GHz r 1.68 x 1.23 0 3. 0 4. 5.0 0. 4 0.2 10.0 5.0 4.0 3.0 2.0 1.0 0.8 0.6 0.4 0 2.45 GHz r 1.55 x 1.16 -10.0 0.2 10.0 2 -0. 4 .0 -5. 0 -3 .0 Figure 21 .0 -2 Swp Min 2GHz -1.0 -0.8 -0 .6 .4 -0 Off mode output Matching of 2.4 GHz WLAN LNA with BFP760 (Smith Chart) Off mode input P1dB compression Point -5 Gain [dB] -10 9.73 dBm -12.28 -30 dBm -11.54 -15 -20 -30 Figure 22 -20 -10 Input Power [dBm] 0 10 Off mode input 1dB compression point of the 2.4 GHz WLAN LNA with BFP760 Application Note AN324, Rev.1.0 21 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Evaluation Board and Layout Information 4 Evaluation Board and Layout Information In this application note, the following PCB is used: PCB Marking: M130125 V1.4e PCB material: FR4 r of PCB material:4.3 (FR4) Figure 23 Photo Picture of Evaluation Board (overview) <PCB Marking Myymmdd Rev. x.x> Figure 24 Photo Picture of Evaluation Board (detailed view) Application Note AN324, Rev.1.0 22 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Evaluation Board and Layout Information Figure 25 Layout Proposal for RF Grounding of the 2.4 GHz WLAN LNA with BFP760 Vias FR4 Core, 0.2mm Copper 35µm Figure 26 FR4 Prepreg, 0.8mm PCB Layer Information Application Note AN324, Rev.1.0 23 / 25 2013-03-06 BFP760 Low Noise Amplifier for 2.4 GHz WLAN with bypass Authors 5 Authors Moakhkhrul Islam, Application Engineer, Technical Marketing RF of Business Unit “RF and Protection Devices” Dr. Chih-I Lin, Senior Staff Engineer, Technical Marketing RF of Business Unit “RF and Protection Devices” 6 Remark The graphs are generated with the simulation program AWR Microwave Office®. Application Note AN324, Rev.1.0 24 / 25 2013-03-06 w w w . i n f i n e o n . c o m Published by Infineon Technologies AG AN324