An offset distribution modification technique of stochastic flash ADC

Abstract

A new non-linearity reduction technique for stochastic flash ADC (SF-ADC) is proposed, focusing on distribution of comparator input-referred offsets. The SF-ADC test chip fabricated in a 130-nm CMOS process demonstrated the proposed technique can improve SNDR. In addition, the digital re-quantization also can improve the linearity more, where quantization level and fractional correction can be optimized using genetic algorithm.