SOLID STATE IMAGING DEVICES AND METHODS USING SINGLE SLOPE ADC WITH ADJUSTABLE SLOPE RAMP SIGNAL

摘要

A solid state imaging device includes a pixel array comprising a plurality of photoelectric conversion devices and an analog to digital conversion (ADC) circuit configured to convert an image signal received from the pixel array to a digital signal responsive to a ramp signal and a gain setting. The solid state imaging device further includes a ramp signal generator circuit configured to generate the ramp signal with a slope that varies responsive to a control signal and a dark level offset compensation circuit configured to generate the control signal responsive to the gain setting and a dark level measurement.