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The paper presents an ultra-wideband, low-power frequency synthesizer for Ku-band FMCW radars. This ADPLL-based frequency synthesizer generates chirps with configurable rate from 0.4 to 3.2GHz/ms, up to 2GHz bandwidth in triangle or sawtooth mode. Adaptive loop bandwidth is adopted to reduce variations of the loop tracking characteristic during ramping under different chirp rate, by which, a low frequency...
A Ku-band wideband power amplifier (PA) for FMCW radar application is proposed and implemented in 65-nm bulk CMOS technology. The PA consists of 3 stages of class AB amplifiers to achieve high gain and high power efficiency. To obtain low group delay (GD), low amplitude ripple and wide bandwidth, transformer and inductor based matching network is designed to meet the requirements. Including pads,...
A broadband CMOS LC voltage controlled oscillator (VCO) for an FMCW synthesizer application was developed, which achieves wide tuning range and low phase noise. The VCO employs a topology of NMOS cross-coupled pair and NMOS tail current source. In order to lower phase noise while fulfill continuous tuning range of 2GHz, P-type AMOS varactors are used, which connect to LC tank through a MIM coupling...
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