A Fixed-Window Level-crossing ADC with a Single Comparator

Abstract A fixed-window level-crossing analog-to-digital converter (LC-ADC) with a single comparator is proposed for the biomedical field. In this paper, signal varying direction detection circuit to judge trend of input signal, instead low-precision in modified LC-ADC. The LC-ADC utilizes only one continuous-time multiple comparators traditional LC-ADC, leading simplified implementation and significantly reducing power consumption. post-layout simulation results show that consumption new reduced, accounting 25.6% high-precision comparator. Designed 0.18 μm CMOS technology, core area 0.007 mm 2 . With 1.8 V supply 1 kHz frequency, it achieves 73.1-dB SNDR by consuming 20.1 μW power. figure-of-merit value 19.3 ·fJ/Conversion.