A Novel Analog Baseband Signal Processing for High Dynamic Range FMCW System

Nowadays, Frequency-Modulated Continuous Wave (FMCW) radar systems are widely used. These radar systems usually suffer from undesired patterns include the interference from transmitter or LO, multiple reflections of static objects in the environment. Traditional baseband processing uses high-pass filters (HPF) to suppress these interferences; however, HPFs have both slow settling due to low cut-off frequency, and attenuation to real objects reflections at near frequency band. Some studies have tried to cancel the interference actively, however additional cancel errors are induced. In this paper, a novel active cancel methodology is proposed with pattern cancel DAC and remove the cancel error with feedforward compensation. It is verified on silicon to be effective to mitigate the interference and enhance the linearity of the FMCW baseband greatly.