公开(公告)号：US20230062619A1

公开(公告)日：2023-03-02

申请号：US17465184

申请日：2021-09-02

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Charles Qingle Wu ,  Yanying He ,  Weiyi Zhang

IPC: H04N5/376 ,  H01L27/02 ,  H04N5/3745 ,  H03L7/08

Abstract: Reference clock CMOS input buffer with self-calibration and improved ESD performance. In one embodiment, a reference clock input buffer of an image sensor includes a Schmitt trigger configured to generate a clock signal having a falling edge and a rising edge. The falling edge and the rising edge are separated by a hysteresis voltage. The Schmitt trigger includes a plurality of output switches and a plurality of voltage control switches that are individually coupled to individual output switches [M2-i] of the plurality of output switches. Voltage of the falling edge signal or the rising edge signal of the Schmitt trigger is adjustable by selectively switching at least one voltage control switch of the plurality of voltage control switches.

公开(公告)号：US11750949B2

公开(公告)日：2023-09-05

申请号：US17465184

申请日：2021-09-02

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Charles Qingle Wu ,  Yanying He ,  Weiyi Zhang

IPC: H04N25/71 ,  H03L7/08 ,  H01L27/02 ,  H04N25/772

CPC classification number: H04N25/745 ,  H01L27/0251 ,  H03L7/08 ,  H04N25/772

Abstract: Reference clock CMOS input buffer with self-calibration and improved ESD performance. In one embodiment, a reference clock input buffer of an image sensor includes a Schmitt trigger configured to generate a clock signal having a falling edge and a rising edge. The falling edge and the rising edge are separated by a hysteresis voltage. The Schmitt trigger includes a plurality of output switches and a plurality of voltage control switches that are individually coupled to individual output switches [M2-i] of the plurality of output switches. Voltage of the falling edge signal or the rising edge signal of the Schmitt trigger is adjustable by selectively switching at least one voltage control switch of the plurality of voltage control switches.