High isolation wideband CMOS T/R switch with leakage cancellation technique for software-defined radio transceiver

Abstract

0.1---3 GHz high isolation wideband CMOS Transmit/Receiver (T/R) switch is presented for software-defined radio (SDR) transceiver. The independent bias technique is proposed to keep the transistors in ideal ON/OFF mode to improve power handling capacity. The leakage cancellation technique with two matched paths is introduced to cancel the leakage from TX port to RX port. The proposed T/R switch has been implemented in 65 nm CMOS. The measured results show that the differential T/R switch achieves 23dBm 1-dB compression point (P1dB) and features 50---70 dB isolation.