公开(公告)号：US11418734B1

公开(公告)日：2022-08-16

申请号：US17408926

申请日：2021-08-23

申请人： OMNIVISION TECHNOLOGIES (SHANGHAI) CO., LTD.

发明人： Yunyi Wang ,  Zejian Wang ,  Yusheng Yang

IPC分类号： H04N5/355 ,  H04N5/378 ,  H04N5/357 ,  H04N5/343 ,  H04N5/369 ,  H04N5/363

摘要： The present invention provides a dual conversion gain image sensor comprising: a pixel circuit, through which pixel power supply voltage noise is transferred to a bit line; a power supply noise cancellation circuit with an input to which the pixel power supply voltage is applied, the power supply noise cancellation circuit mimicly producing a first transfer function with the aid of a low conversion gain path, the power supply noise cancellation circuit mimicly producing a second transfer function with the aid of a high conversion gain path; and a comparator. According to the present invention, the low and high conversion gain paths are two independent power supply noise cancellation paths that result in different transfer functions capable of tracking the variation of the pixel power supply voltage in low and high conversion gain modes.