470 / 2019-02-27 21:46:27

A 47GHz Mixed-Mode FMCW Signal Generator for Fast Triangular Chirp Modulation

FMCW,fast chirp,PLL,sigma-delta modulator

全体主题 > Wireless Communication

A 47GHz frequency-modulated continuous-wave (FMCW) radar is presented. A current DAC with a 10bit 1st sigma-delta modulator is utilized to improve the equivalent DCO 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 200us period, which has been verified by MATLAB/Simulink.