Wei Zhang, Yizhi Han, Fei Chen, Bo Zhou, Xican Chen, W. Rhee, Zhihua Wang
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A 3.5–4GHz FMCW radar transceiver design with phase-domain oversampled ranging by utilizing a 1-bit ΔΣ TDC
A 3.5-4GHz FMCW radar transceiver employing a phase-domain oversampled ranging method is implemented in 0.18μm CMOS for short-range wireless sensor network (WSN) applications. To overcome the tradeoff between bandwidth and ranging resolution in the conventional FMCW radar, a digital phase rotator and a 1-bit ΔΣ TDC are utilized to realize the oversampled phase-domain ranging, achieving both wide capture range and fine resolution. The proposed ranging method is verified in the prototype FMCW transceiver hardware and the feasibility of sub-cm ranging capability is also demonstrated based on on-board modulation measurement.
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