CORRELATED DOUBLE SAMPLING CIRCUIT FOR PERFORMING CORRELATED DOUBLE SAMPLING AND CYCLIC ANALOG DIGITAL CONVERTOR DEVICE HAVING THEREOF

摘要

Cyclic analog-to-digital conversion apparatus disclosed herein, and sampling the reset voltage, amplifies twice the sampled reset voltage and a first correlating double sampling circuit for subtracting a first reference voltage at the two-fold amplified reset voltage, sampling the signal voltage, amplified twice the sampled signal voltage and a second correlation double sampling circuit for subtracting a second reference voltage from the two-fold amplified signal voltage, wherein the first and second correlated double sampling a differential amplifier circuit which outputs a difference between the subtraction result of the circuit, a comparison circuit for comparing the output with a predetermined comparison voltage of the differential amplifying circuit, and outputting a comparison result as a digital value; And in response to the digital value of a digital input for controlling the timing of the first reference voltage and the second reference voltage-to-analog converter.