A 180nm fully-integrated dual-channel reconfigurable receiver for GNSS interoperations

A fully-integrated dual-channel reconfigurable GNSS (GPS/GLONASS/Galileo/Compass) receiver in 180nm CMOS is presented, supporting simultaneous dual-system signal reception. Two channels of the receiver share RF front-end circuits and the frequency synthesizer, and employ separate IF-strips to support the different navigation systems. Reconfigurable signal bandwidths are supported, covering from 2.2MHz to 10MHz to implement both civil and high precision positioning. The on-chip I/Q mismatch calibration circuit is integrated to improve the image rejection ratio (IRR), which can be realized automatically with the aid of a FPGA. Besides, the receiver integrates internal AFC, DCOC, LDO and DCXO, which make it a complete GNSS radio. Thanks to the power scalable analog baseband circuits, the power consumption in the typical dual-channel mode is reduced to 23mA. The receiver achieves 2.5dB noise figure, 55dB dynamic range with 1dB steps, 50dB IRR and -57dBm input 1dB-compression point. The receiver can cooperate with a digital baseband to track real-time satellites in the open sky, achieving higher than 40dB CNR for both GPS and Compass systems.