A 47ghz Mixed-Mode Fmcw Signal Generator For Fast Triangular Chirp Modulation

Guopei Chen,Ruichang Ma,Mengdi Cao,Luqiang Duan,Zhiyuan Chen,Wei Deng,Baoyong Chi

2019 IEEE INTERNATIONAL CONFERENCE ON ELECTRON DEVICES AND SOLID-STATE CIRCUITS (EDSSC)（2019）

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摘要

A 47GHz frequency-modulated continuous-wave (FMCW) radar is presented. A current DAC with a 10bit 1st EA modulator is utilized to improve the equivalent DC() frequency resolution. A type-II PLL with the polarity alternation is proposed to remove the frequency error at turning-around points (TAPs). The rms frequency error is improved 10x with 7GHz bandwidth and 200 mu s period, which has been verified by MATLAB/Simulink.

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关键词

FMCW, fast chirp, PLL, sigma-delta modulator

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