A 0.5V signal-specific continuous-time level-crossing ADC with charge sharing

This paper presents a novel continuous-time level-crossing analog-to-digital converter (LC-ADC) targeted at biomedical signal sensing applications. The conventional digital-to-analog converter (DAC) is replaced by a charge sharing block, leading to lower power consumption, less design complexity and more flexibility for various resolution applications. Designed to be implemented in 90 nm CMOS technology, the proposed ADC achieves a maximum SNDR of 51.4dB and consumes a minimum power of 538nW from a dual supply of 0.5V and 0.7V.