BFP640 used for 1575 MHz Global Positioning Satellite (GPS) Applications BFP640 is investigated for use as an LNA for 1575 MHz GPs Design Goals: Gain = 16 dB min, Noise Figure < 0. 6 dB, Input / Output Return Loss 10 dB or better, current < 10 mA from a 3. 0 Volt power supply, Input P1dB > -14. 8 dBm min Printed Circuit Board used is Infineon Part
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Number 640-061603 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 mm ². Total Parts count, including the BFP640 Transistor is 12. Achieved ‰… 17 dB gain, 0. 92 dB Noise Figure at 1575 MHz from 3. 0 V supply drawing 8. 3 mA. 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. Input P1dB ‰ -13. 1 dBm @ 1575. 4 MHz. Outstanding Input Third Order Intercept of +7. 7 dBm.
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