公开(公告)号：US11240458B2

公开(公告)日：2022-02-01

申请号：US16900576

申请日：2020-06-12

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Hiroaki Ebihara ,  Rui Wang ,  John Brummer ,  Shan Chen

IPC: H04N5/378 ,  H04N5/365 ,  H04N5/355

Abstract: A pixel cell readout circuit includes a bitline input stage coupled to a bitline to receive an image signal from a pixel cell. A capacitor ratio circuit is coupled to the bitline input stage. A gain of the bitline input stage is responsive to a capacitor ratio provided by the capacitor ratio circuit to the bitline input stage. A switch control circuit is coupled to receive a gain signal. The switch control circuit is coupled to generate a randomized pattern selection signal coupled to be received by the capacitor ratio circuit to select the capacitor ratio provided by the capacitor ratio circuit in response to the gain signal.

公开(公告)号：US20210392286A1

公开(公告)日：2021-12-16

申请号：US16900576

申请日：2020-06-12

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Hiroaki Ebihara ,  Rui Wang ,  John Brummer ,  Shan Chen

IPC: H04N5/378 ,  H04N5/355 ,  H04N5/365

Abstract: A pixel cell readout circuit includes a bitline input stage coupled to a bitline to receive an image signal from a pixel cell. A capacitor ratio circuit is coupled to the bitline input stage. A gain of the bitline input stage is responsive to a capacitor ratio provided by the capacitor ratio circuit to the bitline input stage. A switch control circuit is coupled to receive a gain signal. The switch control circuit is coupled to generate a randomized pattern selection signal coupled to be received by the capacitor ratio circuit to select the capacitor ratio provided by the capacitor ratio circuit in response to the gain signal.