A Doppler-Assisted 76 GHz PMCW Radar with Meter-Scale Unambiguous Range and μm-Scale Range Accuracy

This work presents a radar transceiver (TRX) featuring a hybrid operation scheme, where Doppler-CW and PMCW are employed in distinct frequency bands to enable cooperative sensing. By synchronizing PRBS generator of PMCW radar and the Doppler radar carrier signal, the joint operation achieves range accuracy down to tens of μm without range ambiguity. The radar chip is fabricated in 65 nm CMOS technology, occupies 1.55 mm^2 of area and consumes 329.7 mW of power, demonstrating 0.18 degrees of phase accuracy leading to 50 μm range accuracy with a meter-scale unambiguous range.