A CMOS wideband LNA with low-loss integrated TX leakage canceller

Abstract

A CMOS wideband LNA with tunable and low-loss integrated TX leakage canceller is presented. The low RX insertion loss of the TX leakage canceller is achieved by the autotransformer with loss compensating amplifier. The proposed TX leakage canceller is fabricated in 0.13µm CMOS process. It provides over 55dB rejection of the TX leakage at the RX port and the notch frequency can be controlled from 866MHz to 961MHz using a digitally controlled 4-bit switched capacitor array. The RX insertion loss of the wideband LNA with the TX leakage canceller decreased by 1dB and the NF is decreased about 0.8dB compared to that without the compensating amplifier.