Title :
A Phase-Domain /spl Delta//spl Sigma/ Ranging Method for FMCW Radar Receivers
Author :
Wei Zhang ; Xican Chen ; Fei Chen ; Woogeun Rhee ; Zhihua Wang
Author_Institution :
Inst. of Microelectron., Tsinghua Univ., Beijing, China
Abstract :
This brief describes a phase-domain oversampled ranging method for high-resolution low-cost frequency-modulated continuous-wave (FMCW) radar systems, aiming for human health monitoring applications. To overcome the limited bandwidth problem for fine ranging resolution in the conventional FMCW radar systems, a ΔΣ ranging digital-intensive receiver architecture is proposed to achieve both wide capture range and fine resolution by utilizing a digital phase rotator and a 1-bit ΔΣ time-to-digital converter. A prototype 4-GHz FMCW radar receiver designed in 0.18-μm CMOS exhibits subcentimeter ranging capability from onboard modulation measurement, consuming 26 mW from a 1.6-V supply.
Keywords :
CMOS integrated circuits; CW radar; FM radar; delta-sigma modulation; microwave receivers; radar receivers; time-digital conversion; ΔΣ time-to-digital converter; CMOS; FMCW radar receivers; digital phase rotator; digital-intensive receiver; fine ranging resolution; frequency 4 GHz; frequency-modulated continuous-wave radar; human health monitoring; onboard modulation measurement; phase-domain ΔΣ ranging method; phase-domain oversampled ranging method; power 26 mW; size 0.18 mum; subcentimeter ranging capability; voltage 1.6 V; word length 1 bit; CMOS integrated circuits; delta–sigma modulation; frequency-modulated continuous-wave (FMCW) radar; time-to-digital converter (TDC); ultrawideband (UWB); wireless sensor network (WSN);
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2013.2268637
