A high quantization resolution and low power consumption single slope ADC scheme

for CMOS image sensor applications is proposed.The proposed scheme is composed of the variable gain amplifier

preamplifier and the dynamic latch comparator.Compared to the prior art structure

the proposed circuit can achieve a reasonable noise performance

consume less power and occupy smaller chip area.This proposed ADC is implemented as a column-parallel ADC array inside a fabricated CMOS image sensor chip.The experimental results verify the conception proposed in this paper.