A Compact Mixer-First Receiver with >24 dB Self-Interference Cancellation for Full-Duplex Radios

This letter presents a single-channel full-duplex receiver with tunable self-interference (SI) cancelling capability through LO phase shifting. The receiver takes advantage of high linearity of the passive mixer-first architecture to eliminate SI without degrading sensitivity due to inter-modulation distortion. The proposed receiver exhibits a DSB noise figure of 8.6-12.5 dB over an operating frequency range of 800 MHz-1.7 GHz. It achieves >70.5 dB SINDR in 16.25 MHz RF signal bandwidth at-18 dBm input SI power. The receiver is implemented in a 130 nm CMOS process and occupies an area of 0.63 mm2.