Low Cost Dimmable Led Ballast Using The Valley Fill Current Shaping Circuit


Posted on Feb 6, 2014

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


Low Cost Dimmable Led Ballast Using The Valley Fill Current Shaping Circuit
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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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