Patent ID: 9055246
Filing Date: 2015-06-09
Classification: H01L,H04N

Abstract:
1. An image sensor, comprising: a photoelectric conversion unit; a sensing node; a transfer switch that electrically connects the photoelectric conversion unit to the sensing node; an output transistor that outputs signals in response to signals on the sensing node; a reset switch that electrically connects a signal line to the sensing node; a first capacitor, the image sensor being configured to sample a first signal onto the first capacitor, the first signal being output by the output transistor when the reset switch operates in triode region and a voltage level is driven across source and drain of the reset switch onto the sensing node; a second capacitor, the image sensor being configured to sample a second signal onto the second capacitor, the second signal being output by the output transistor when the reset switch is non-conducting and the transfer switch operates in triode region; a third capacitor, the image sensor being configured to sample a third signal onto the third capacitor, the third signal being output by the output transistor after the second signal when the reset switch remains non-conducting and the transfer switch has switched to become non-conducting; a fourth capacitor, the image sensor being configured to sample one of the first to third signals onto the fourth capacitor; and, a first circuit configured to form: