An Integrated CMOS Passive Self-Interference Mitigation Technique for FDD Radios

Abstract

This paper presents an integrated passive self-in- terference mitigation (SIM) technique for FDD radios. A Four Port Canceller (FPC) serves a dual function as a receiver input matching network, and provides an auxiliary path from the trans- mitter (TX) to the receiver (RX) to perform leakage cancellation, with minimal penalty on the RX noise figure (NF), and power consumption. An example of this technique is applied to the design of a WCDMA front-end cons isting of a low noise amplifier (LNA), the