A 77 GHz FMCW MIMO radar system based on 65nm CMOS cascadable 2T3R transceiver

Ma T K, Chen Z P, Wu J X, et al

Sci China Inf Sci, 2021, 64(1): 114301

In recent years, many studies on millimeter-wave (mm-wave) radar have been published. Compared with other traditional vision sensors like ultrasound, camera, and laser radar, mm-wave radar is more attractive owing to its low cost, high resolution, high integration, and strong robustness against bad weather. Frequency-modulated continuouswave (FMCW) radar is the most widely studied mm-wave radar because of its simple structure, easy realization, and powerful function. At present, the research of mm-wave radar mainly focuses on two frequency bands, 24 GHz and 77 GHz. Between them, the research on 24 GHz radar has started earlier and is more mature now. It is mainly used in car's advanced driving assistant systems (ADAS). Compared with 24 GHz, the 77 GHz radar has a smaller size (including chips and antennas) because of its higher frequency. In addition, the 77 GHz radar is able to achieve wider bandwidth, leading to a higher range resolution, because the range resolution is inversely proportional to the radar's sweep bandwidth.
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