An Integrated CMOS Passive Transmitter Leakage Suppression Technique for FDD Radios

Abstract

This thesis presents an integrated passive self-interference mitigation (SIM) technique for FDD Radios. A new structure, Four Port Canceller (FPC) serves a dual function as a receiver (RX) input matching network, and provides an auxiliary path from transmitter (TX) to RX, used for leakage cancellation, with minimal penalty on the RX noise figure (NF), power consumption and silicon area. An example of this technique is applied to the design of WCDMA front-end including the FPC, a low noise amplifier (LNA) and an emulated power amplifier (PA) in a 40nm, 6-metal-layer TSMC CMOS process. A measured TX leakage suppression of more than 20dB is achieved with TX power level from 5 dBm to 30 dBm, over a bandwidth of 5MHz.