2 - High Frame-Rate VGA CMOS Image Sensor using Non-Memory Capacitor Two-Step Single-Slope ADCs

摘要

The present invention relates to a two-stage single-slope analog-to-digital converter, and more particularly, to a two-step single-slope analog-to-digital converter which includes a signal input unit to which an initial value or a signal is applied, A ramp generator, a precision ramp generator for generating a precision ramp used to perform fine conversion on the result of performing the precision conversion, a correlation for performing the conversion using the precision ramp and precision ramp, A coarse local counter for counting the precision conversion result of the correlated double sampling unit and a precision local counter for counting the precision conversion result of the correlated double sampling unit; , The non-precision ramp generator is configured to calculate a ratio between the maximum uncertain lamp voltage, a series of resistors, The sampling rate can be improved, the area consumption is smaller than that of the prior art, the speed is fast because the sufficient time for the charging of the memory capacitor is not awaited and the parasitic capacitor Can be greatly improved.