This paper presents a low power interference-robust radar transceiver architecture for noncontact vital sign detection and mobile healthcare applications. A duty-cycled transceiver design is proposed to significantly reduce power consumption of front-end circuits. Occupying 3-to-5 GHz band with four 500 MHz sub-channels, the radar mitigates the narrowband interference (NBI) problem with the frequency hopping scheme. In the time domain, the    $\Delta \Sigma $    TDC is employed to achieve fine ranging resolution with noise shaped oversampling. The transceiver implemented in 65 nm CMOS consumes 17.2 mW from a 1.0-V supply when duty-cycled and achieves an RMS detection accuracy of 5.68 mm.
['Xican Chen', 'Yiyu Shen', 'Zhicheng Wang', 'Woogeun Rhee', 'Zhihua Wang']
A 17 mW 3-to-5 GHz Duty-Cycled Vital Sign Detection Radar Transceiver With Frequency Hopping and Time-Domain Oversampling