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This paper presents the design and implementation of a 180 nm CMOS reconfigurable global navigation satellite system receiver, supporting GPS L1, Galileo E1 and Compass B1 bands. The low-IF receiver incorporates a pseudo-differential low-noise amplifier, a double-balanced passive mixer, a pair of trans-impedance amplifiers, a complex band-pass filter, an analog-to-digital converter and an automatic gain control. A phase-locked loop is integrated to provide 25% duty-cycle quadrature clock signals. The RF front-end achieves a maximum gain of 107.2 dB with a dynamic range of 78 dB, a noise figure of 1.8 dB and an image rejection ratio of 39.1 dB.

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