An integrated CMOS passive transmitter leakage suppression technique for FDD Radios

An integrated passive transmitter (TX) leakage suppression technique is proposed for FDD Radios. A Four Port Canceller (FPC) serves a dual function as a receiver (RX) input matching network, and provides an auxiliary path from TX to RX, used for leakage cancellation, without degrading the RX noise figure (NF). The FPC is integrated with a low noise amplifier (LNA) and an emulated power amplifier (PA) in 40nm CMOS process. A cancellation of 23dB is achieved with a negligible power consumption and noise penalty.