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March 2007 [Components] LNA And Distributed Filtering Maintain 1.5-dB GPS Noise Figure Cell phones must now integrate Global Positioning System (GPS) functionality to satisfy the E911 mandate. Although many GPS receiver/processor integrated circuits (ICs) incorporate on-board low-noise-amplifier (LNA) front ends, the noise performance and resultant system sensitivity of these integrated LNAs are not always adequate. To reduce trace losses, discrete LNAs can be located near the antenna. When coupled with tuning and filtering, this approach can improve... |
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