A 100-GHz Double-Sideband Low-IF CW Doppler Radar in 65-nm CMOS for Mechanical Vibration and Biological Vital Sign Detections

• Published in: 2019 IEEE MTT-S International Microwave Symposium (IMS) pp. 136 - 139
• Main Authors: Xujun Ma, Yiyang Wang, Wenlian Song, Xiaohu You, Jenshan Lin, Lianming Li
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-06-2019
• Subjects: Bullfrog's vital sign; Doppler radar; Human heartbeat; low intermediate-frequency (IF) architecture; mechanical vibration; Mixers; Radar antennas; Radar detection; Radar transceiver; Transceivers; Vibrations
• ISSN: 2576-7216
• DOI: 10.1109/MWSYM.2019.8701067

Based on the double-sideband low intermediate-frequency (IF) architecture, a 100-GHz CMOS radar transceiver is realized for non-contact small mechanical vibration and biological vital sign detections. A 50-GHz push-push frequency doubler with off-chip VCO is used to generate the 100-GHz local oscillator (LO) signal for the transmitter (TX) and the receiver (RX). Injected by a 40-mV 1-kHz sinusoidal IF carrier input, the TX achieves a relatively constant 4-dBm output power over 93- 105 GHz. Under a -36-dBm RF input from 95 to 104 GHz, the RX achieves <; 1 dB I/Q amplitude imbalance, <; 1° phase mismatch and 236-341 mV quadrature IF differential output. With two horn antennas, the radar system successfully detects the mechanical vibration with 0.4-mm displacement, human heartbeat, and a bullfrog's vital sign at 103 GHz. Fabricated in a 65-nm CMOS, the transceiver chip has a size of 1.8 mm 2 and consumes 341 mW from a 1.2-V power supply.