A 20GHz Radar Receiver RF front-end with Tx-to-Rx spillover cancellation circuit

This paper presents the design of a 20GHz radar receiver RF front-end consisting of a two-stage low-noise amplifier, a mixer, an IF amplifier, and impedance transformers. In addition, the procedure for adjusting the values of the block parameters to achieve optimal values of the system characteristics is presented. Also, cancellation methods for spillover between transmitter (Tx) and receiver (Rx) are explained, and a circuit canceling Tx-to-Rx spillover in the IF domain is designed. The circuits were designed and simulated in the Cadence software using 65nm TSMC technology. The simulation results show a Tx-to-Rx spillover cancellation of 11.78dBc for 20MHz unwanted signal.