BF P640 High Lin e arit y BF P640 L N A f or WLAN 5-6 G Hz Appli c ation Technic al Rep ort T R 141 Revision: V1.0 Date: 27 July 2009 RF and protecti on d evic es Edition 27 July 2009 Published by Infineon Technologies AG 81726 Munich, Germany © 2009 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. Technical Report TR141 High Linearity BFP640 LNA for WLAN 5-6GHz Application TR141 Revision History: 27 July 2009 Previous Revision: No Revision Page Technical Report, TR141 3 / 11 27 July 2009 Technical Report TR141 High Linearity BFP640 LNA for WLAN 5-6GHz Application 1 Overview Device : BFP640 Application: High Linearity BFP640 LNA for WLAN 5-6GHz Application PCB Marking: 740-081009 Rev A 2 Summary of Measurement Results Table 1 Summary of Measurement Results Parameter Symbol Value Unit Frequency Range Freq 5-6 GHz DC Voltage Vcc 5 V Icc mA 83 mA Gain G 8.7 dB Power@Port1: -30dBm Noise Figure NF dB Including SMA connectors and PCB losses of 0.1dB Input Return Loss RLin 10.1 dB Output Return Loss RLout 8.8 dB Reverse Isolation IRev 17.6 dB Input P1dB IP1dB 8.8 dBm Output P1dB OP1dB 16.5 dBm Input IP3 IIP3 20.1 dBm Output IP3 OIP3 28.8 dBm Stability k >1.2 -- Technical Report, TR141 2.6 4 / 11 Note/Test Condition Power@Port2:-30dBm Power@Input: -10dBm @5500/5501MHz ∆f =1MHz Stability measured from 100MHz to 10GHz 27 July 2009 Technical Report TR141 High Linearity BFP640 LNA for WLAN 5-6GHz Application 3 Description This Technical report provides the actual results of the LNA using the BFP640 from Infineon Technologies for the WLAN 5-6GHz applications. This Low Noise Amplifier brings a gain of 8.7dB minimum between the frequency Range of 5-6GHz with a noise figure of 2.7dB (including SMA connectors and PCB losses of 0.1dB). Furthermore, this device provides an unconditional stability from 100MHz up to 10GHz. The circuit is matched in input and output and presents an input return loss of 10.0dB and 8.8dB concerning the output. At the frequency of 5500MHz, using two tones spaced of 1MHz, the output third-order intercept point reaches 28.8dBm. Besides we obtain an input -1dB compression point of 8.8dBm. Technical Report, TR141 5 / 11 27 July 2009 Technical Report TR141 High Linearity BFP640 LNA for WLAN 5-6GHz Application 4 Schematics Figure 4-1: Schematics of the BFP640 for the WLAN 5-6GHz Application Table 2 : Bill of Materials C1 0.8 pF 0402 AVX-0402J C2 1 nF 0402 Various RF Bypass C3 1 nF 0402 Various RF Bypass C4 0.8 pF 0402 AVX-0402J L1 3.3 nH 0402 Murata LQP10A Input Matching/DC Feed L2 2.7 nH 0402 Murata LQP10A Output Matching/DC Feed R1 7.5 Ω 0402 various Voltage setting R2 6.8 kΩ 0402 various Base current setting R3 8 Ω 0402 various Collector current setting TSLP7-1 Infineon SiGe Transistor BFP640 Q1 Technical Report, TR141 6 / 11 Input Matching/DC Block Output Matching/DC Block 27 July 2009 Technical Report TR141 High Linearity BFP640 LNA for WLAN 5-6GHz Application 5 Measured Graphs Transducer Power Gain 25 20 5000 MHz 10.44 dB 15 5500 MHz 9.863 dB 6000 MHz 8.689 dB 10 5 0 4000 4500 5000 5500 6000 Frequency (MHz) 6500 7000 Figure 5-1: Power Gain of the BFP640 for WLAN 5-6GHz Application Input Matching 0 -5 -10 -15 5000 MHz -10.09 dB 5500 MHz -17.49 dB -20 -25 6000 MHz -27.92 dB -30 -35 -40 4000 4500 5000 5500 6000 Frequency (MHz) 6500 7000 Figure 5-2: Input Matching of the BFP640 for WLAN 5-6GHz Application Technical Report, TR141 7 / 11 27 July 2009 Technical Report TR141 High Linearity BFP640 LNA for WLAN 5-6GHz Application Output Matching 0 6000 MHz -8.79 dB -5 -10 5000 MHz -19.4 dB -15 5500 MHz -12.45 dB -20 -25 4000 4500 5000 5500 6000 Frequency (MHz) 6500 7000 Figure 5-3: Output Matching of the BFP640 for WLAN 5-6GHz Application Reverse Isolation 50 45 40 35 30 5000 MHz 18.81 25 5500 MHz 17.88 6000 MHz 17.6 20 15 10 4000 4500 5000 5500 6000 Frequency (MHz) 6500 7000 Figure 5-4: Reverse Isolation of the BFP640 for WLAN 5-6GHz Application Technical Report, TR141 8 / 11 27 July 2009 Technical Report TR141 High Linearity BFP640 LNA for WLAN 5-6GHz Application Stability 5 4 3 3837.4 MHz 1.26 2 1 0 10 1010 2010 3010 4010 5010 6010 Frequency (MHz) 7010 8010 9010 10000 Figure 5-5: Stability of the BFP640 for WLAN 5-6GHz Application Figure 5-6: OIP3 of the BFP640 for WLAN 5-6GHz Application Technical Report, TR141 9 / 11 27 July 2009 Technical Report TR141 High Linearity BFP640 LNA for WLAN 5-6GHz Application 6 Evaluation Board and layout Information Figure 6-1: PCB picture of the BFP640 for WLAN 5-6GHz Application Figure 6-2: Layout Information Technical Report, TR141 10 / 11 27 July 2009 w w w . i n f i n e o n . c o m Published by Infineon Technologies AG TR141