A 30-GHz Bandwidth Low-Power W-Band 4-TX and 4-RX Chipset for High-Resolution Radars in 65nm CMOS

This paper presents a low-power W-band chipset integrating four transmit (TX) channels and four receive (RX) channels, which supports a 30-GHz bandwidth for high-resolution frequency-modulated continuous-wave (FMCW) radars. To achieve a wide bandwidth with high in-band harmonic rejection, the LO network consists of a ×8 frequency multiplier by cascading three balanced push-push doubler and wideband drivers. In the TX chip, a gain staggering technique is adopted for the broadband power amplifier (PA), whereas an N-path mixer-first RX architecture is employed in the RX chip to achieve wide bandwidth and high linearity. Fabricated in 65-nm CMOS process, the transmitter achieves 10-dBm output power and a 34 to 54 dBc harmonic rejection ratio (HRR) across the 65 to 95 GHz bandwidth. The receiver has a conversion gain of 15 dB and above -15 dBm input 1 dB compression point. The power consumption per channel is 192 mW and 97 mW in the TX and RX chips, respectively, showing a low power feature in wideband W-band radar transceivers.