Patent ID: 6670914
Filing Date: 2003-12-30
Classification: G01S,H03G,H04B

Abstract:
A GPS receiver comprising:downconversion circuitry adapted to receive an amplified GPS input signal and a first synthesizer output signal and produce an IF signal from said amplified GPS input signal; a first variable amplifier operatively associated with said downconversion circuitry and noise automatic gain control circuitry, wherein said noise automatic gain control circuitry is adapted to control said first variable amplifier to ensure linear operation and avoid compression of said IF signal and provide an amplified IF signal to filtering circuitry; and a second variable amplifier adapted to amplify a filtered IF signal from said filtering circuitry and operatively associated with a gain control circuit adapted to control said second variable amplifier to control a level of said filtered IF signal, which is presented to sampling circuitry for digitization prior to baseband processing.