一款面向室内定位与生命体征检测的多普勒辅助FMCW雷达OA

This paper presents a Doppler-assisted frequency-modulated continuous-wave(FMCW)radar that combines the precise range resolution capability of FMCW with the high sensitivity of Doppler radar,enabling versatile performance for indoor applications.A comprehensive analysis of low-frequency noise contributions from key receiver blocks,including the low-noise amplifier(LNA),mixer,local oscillator(LO)buffer,and analog baseband(ABB)circuits,is conducted.An"RF+LO+BB"joint noise figure(NF)improvement method is proposed to effectively suppress the low-frequency noise.To reduce frequency modulation(FM)error in charge-pump-based fractional-N phase-locked loop(PLL),a nested-PLL architecture with a co-optimized loop parameter selection method is employed,resulting in significantly improved chirp linearity.Fabricated in a 55 nm CMOS technology,the proposed Doppler-assisted FMCW radar achieves NFs of 32 dB and 12 dB at 10 Hz and 1 kHz,respectively,and a chirp linearity of 0.003 9%over a 3.52 GHz chirp bandwidth(BW),resulting in a maximum detection range of 19.41 m and a range resolution of 4.7 cm.The radar occupies a die area of 12.7 mm2 and consumes 594 mW in FMCW mode and 432 mW in Doppler mode under a 3.3 V supply.