Patent ID: 8582004
Filing Date: 2013-11-12
Classification: H01L,H04N

Abstract:
1. An image sensor, comprising: a photodetector; an output transistor having a gate coupled to receive a signal from said photodetector; a reset transistor having a source terminal coupled to reset said photodetector; a sample circuit coupled to receive an output signal from said output transistor, said sample circuit including a first capacitor that has a first terminal and a second terminal and a second capacitor that has a third terminal and a fourth terminal, the first and third terminals being respectively connected to receive output signals from said output transistor; and a control circuit having: wherein said control circuit selects a first voltage level for the second terminal to sample the first output signal and selects a second voltage level for the fourth terminal to sample the second output signal, wherein the second voltage level is offset from the first voltage level in a direction same as the first output signal is offset from the second output signal.