TWO PATH SIGMA-DELTA ANALOG-TO-DIGITAL CONVERTER AND IMAGE SENSOR HAVING THE SAME

摘要

PURPOSE: A two-path sigma-delta analog-to-digital converter and an image sensor including the same are provided to process two different inputs through one calculating amplifier by shaping the calculating amplifier. CONSTITUTION: An integrator(510) divides a clock signal into a front cycle and a back cycle by sharing one calculating amplifier. The integrator integrates a first input signal during the back cycle. The integrator integrates a second input signal during the first cycle. A quantizer(540) quantizes a signal which is integrated through the integrator and outputs first and second digital signals. A feedback path(550) feeds-back the first and the second digital signals.