公开(公告)号：US20240291499A1

公开(公告)日：2024-08-29

申请号：US18176373

申请日：2023-02-28

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Hiroaki Ebihara ,  Chengcheng Xu ,  Satoshi Sakurai ,  Kenny Geng

IPC: H03M1/46

CPC classification number: H03M1/466 ,  H03M1/462

Abstract: A tail current source of a comparator includes a first transistor and a second transistor configured to operate as current sources, wherein the first and second transistors are coupled between a tail node of the comparator and a voltage node, and wherein the tail comprises a node coupled to first and second inputs of the comparator. The tail current source also includes a switch configured to selectively couple the second transistor between the tail and the voltage node, and a bias voltage source coupled to gates of the first and second transistors. The switch is configured to be on during an analog-to-digital conversion (ADC) reset signal period and an ADC image signal period, and the switch is configured to be off during an auto-zero period, a period between the ADC reset signal and image signal periods, and a period after the ADC image signal period.

公开(公告)号：US20220078365A1

公开(公告)日：2022-03-10

申请号：US17531465

申请日：2021-11-19

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Chengcheng Xu ,  Rui Wang ,  Bi Yuan ,  Liang Zuo

IPC: H04N5/378 ,  H04N5/3745 ,  H04N5/374 ,  H04N5/376 ,  H04N5/369

Abstract: An image sensing device includes an image sensing circuit, a voltage supply grid, bitlines, and a control circuit. The image sensing circuit includes pixels arranged in rows and columns. Each one of the bitlines is coupled to a corresponding one of the columns. The voltage supply grid is coupled to the pixels. The control circuit is coupled to output at least a row select signal and a transfer signal to the rows. Each one of the rows is selectively coupled to the bitlines to selectively output image data signals in response to the row select signal and the transfer signal. Each one of the rows is further selectively coupled to the bitlines to selectively clamp the bitlines in response to the row select signal and the transfer signal. Each one of the rows is selectively decoupled from the bitlines in response to the row select signal.

公开(公告)号：US20210176417A1

公开(公告)日：2021-06-10

申请号：US16708135

申请日：2019-12-09

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Chengcheng Xu ,  Rui Wang ,  Bi Yuan ,  Liang Zuo

IPC: H04N5/378 ,  H04N5/3745

Abstract: An image sensing device includes an image sensing circuit, a voltage supply grid, bitlines, and a control circuit. The image sensing circuit includes pixels arranged in rows and columns. Each one of the bitlines is coupled to a corresponding one of the columns. The voltage supply grid is coupled to the pixels. The control circuit is coupled to output at least a row select signal and a transfer signal to the rows. Each one of the rows is selectively coupled to the bitlines to selectively output image data signals in response to the row select signal and the transfer signal. Each one of the rows is further selectively coupled to the bitlines to selectively clamp the bitlines in response to the row select signal and the transfer signal. Each one of the rows is selectively decoupled from the bitlines in response to the row select signal.