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This letter describes the design of a triple-band Global Positioning System (GPS) receiver that simultaneously covers the L1, L2 and L5 frequency bands. The proposed receiver uses an imagerejection technique that can separate signals from the three frequency bands to three corresponding ports. It uses a single RF path containing a low-noise amplifier (LNA), and active and passive mixers with a pair of local oscillator signals. The triple-band GPS RF front-end chip is fabricated using 130 nm CMOS technology, and has a noise figure of less than 7.1 dB and an S11 coefficient of less than −10 dB in the frequency range 1.15-1.6 GHz. The experimental results demonstrate a 35-40 dB image rejection ratio at each output port with a power consumption of 7.2 mW (LNA and mixers) using a 1.2 V supply voltage.

Design of triple-band CMOS GPS receiver RF front-end