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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.