公开(公告)号：US11181419B2

公开(公告)日：2021-11-23

申请号：US16155616

申请日：2018-10-09

Applicant: OmniVision Technologies, Inc.

Inventor： Trygve Willassen ,  Olivier Bulteel ,  Trung Nguyen ,  Robert Johansson

IPC: G01S17/894 ,  G01J1/46 ,  G01J1/42 ,  G01S17/08 ,  G01S7/4865 ,  G01S7/4863 ,  G01J1/44

Abstract: A threshold detection circuit includes a plurality of capacitors. A plurality of switching circuits is coupled to the capacitors such that a first end of each of the capacitors is coupled to a corresponding photon sensor during detection intervals, and the first end of each capacitor is coupled to a variable initialization value during reset intervals. A threshold number of the capacitors are initialized to a first value and the remaining capacitors are initialized to a second value during reset intervals. A comparator is coupled to a second of the capacitors to generate a detection event in response to the threshold number of photon sensors sensing one or more incident photons during detection intervals.