An S-Band CMOS Mixer-First Single-RF-Port Duplexing FMCW Radar

A mixer-first single-RF-port duplexing RF frontend is proposed and implemented for frequency-modulated continuous-wave (FMCW) radar applications in this paper. The RF frontend is a bidirectional simultaneous frequency up-and-down converter. Equations of basic parameters of the frontend are derived to provide design criteria. The proposed radar architecture has been evaluated with an S-band (3.3-3.6 GHz) FMCW radar. The radar chip is fabricated in a 65nm CMOS process, and it consumes 190 mW of DC power under 1.2V supply. A wireless distance measurement has verified the function of the radar chip.