A dual-channel GPS/Compass/Galileo/GLONASS reconfigurable GNSS receiver in 65nm CMOS

A fully-integrated dual-channel reconfigurable GNSS receiver supporting GPS/Compass/Galileo/GLONASS in 65nm CMOS is presented. The receiver has two independent channels to support simultaneous dual-frequency reception, and can be reconfigured to receive various GNSS signals located in 1.2GHz or 1.57GHz band, which have different signal bandwidth including 2.2MHz, 4.2MHz, 8MHz, 10MHz and 18MHz. By flexible frequency plan, low-IF/zero-IF architecture switching and flexible analog baseband circuits, only one frequency synthesizer is adopted to provide local oscillation (LO) for two channels simultaneously, which could avoid the LO crosstalk issue. Analog baseband circuits employ operational amplifiers capable of power scaling to optimize power consumption among various mode operations. Besides, an I/Q mismatch calibration module placed ahead of the IF complex bandpass filter is implemented to improve image rejection ratio. The receiver finally achieves 2.2dB noise figure, an average of 50dB image rejection ratio, and 64dB dynamic range with 1dB gain-adjusting steps, while consuming a minimum of 31mW power.