A L1-Band RF receiver for GPS aplication in 0.13um CMOS technology

This paper presents a L1-Band RF receiver for GPS application in 0.13 mum CMOS technology. The receiver is based on a 4.092 MHz low-IF architecture to alleviate the DC-offset problem. It includes a low-noise amplifier (LNA), a down-conversion mixer, a bandpass filter, and variable gain amplifier (VGA). The gain of VGA is controlled digitally by the digital gain controller and the total dynamic range of the baseband part is 60 dB. The franctional-N frequency synthesizer with sigma-delta modulator is used to allow multiple reference clock frequencies. The phase noise is -123 dB/Hz at 1 MHz offset. The whole receiver dissipates 45 mW with 1.2 V supply. And the system noise figure (NF) is 4 dB.