公开(公告)号：US11968468B2

公开(公告)日：2024-04-23

申请号：US17659045

申请日：2022-04-13

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Hiroaki Ebihara ,  Zhenfu Tian ,  Peter Bartkovjak ,  Satoshi Sakurai

IPC: H04N25/772 ,  H03K5/24 ,  H03M1/12 ,  H03M1/56 ,  H04N17/00 ,  H04N25/709 ,  H04N25/75

CPC classification number: H04N25/772 ,  H03K5/24 ,  H03M1/1245 ,  H03M1/56 ,  H04N17/002 ,  H04N25/709 ,  H04N25/75

Abstract: A ramp buffer circuit includes a ramp buffer input device having an input coupled to receive a ramp signal. A current monitor is circuit coupled to a power line and the ramp buffer input device to generate a current monitor signal in response to an input current conducted through the ramp buffer input device. A corner bias circuit is coupled to the current monitor circuit to generate an assist bias voltage in response to the current monitor signal. A bias current source is coupled to an output of the ramp buffer input device. An assist current source is coupled to the corner bias circuit and coupled between the output of the ramp buffer input device and ground to conduct an assist current from the output of the ramp buffer input device to ground in response to the assist bias voltage.

公开(公告)号：US20230336891A1

公开(公告)日：2023-10-19

申请号：US17659045

申请日：2022-04-13

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Hiroaki Ebihara ,  Zhenfu Tian ,  Peter Bartkovjak ,  Satoshi Sakurai

IPC: H04N5/3745 ,  H03M1/56 ,  H03M1/12 ,  H03K5/24 ,  H04N17/00 ,  H04N5/378 ,  H04N5/369

CPC classification number: H04N5/37455 ,  H03M1/56 ,  H03M1/1245 ,  H03K5/24 ,  H04N17/002 ,  H04N5/378 ,  H04N5/3698

Abstract: A ramp buffer circuit includes a ramp buffer input device having an input coupled to receive a ramp signal. A current monitor is circuit coupled to a power line and the ramp buffer input device to generate a current monitor signal in response to an input current conducted through the ramp buffer input device. A corner bias circuit is coupled to the current monitor circuit to generate an assist bias voltage in response to the current monitor signal. A bias current source is coupled to an output of the ramp buffer input device. An assist current source is coupled to the corner bias circuit and coupled between the output of the ramp buffer input device and ground to conduct an assist current from the output of the ramp buffer input device to ground in response to the assist bias voltage.