Abstract
Higher chirp bandwidth in FMCW radar provides better range resolution but comes with higher phase noise and design complexity. This paper presents a multi-mode FMCW synthesizer and radar architecture, to simultaneously achieve low phase noise performance for longer-range applications, and higher range resolution performance in near-range/imaging applications. It uses two low phase noise VCOs with overlapping frequency bands, and a digital combining architecture, addressing static as well as moving scenarios. The paper concludes with silicon results from a two-VCO 60GHz radar and a two-VCO 77GHz radar, achieving 6.8GHz and 5GHz chirp bandwidths, respectively.
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