A W-Band Spillover-Tolerant Mixer-First Receiver for FMCW Radars

This paper presents a highly linear, low-noise W-band N-path mixer-first receiver for frequency-modulated continuous-wave (FMCW) radar applications. By adopting a high-impedance quarter-wavelength transmission line as the matching network, the input impedance at the fundamental and third-harmonic frequencies has been enhanced, thereby increasing the passive voltage gain and eliminating the reradiation current. Hence, the linearity and noise figure (NF) can be improved. Fabricated in 40 nm CMOS process, the receiver achieves −0.7 dBm out-of-band (OOB) PldB and 8.0-to-9.5 dB NF simultaneously while consuming 37 mW power.