公开(公告)号：US11555744B2

公开(公告)日：2023-01-17

申请号：US17048046

申请日：2019-04-17

Applicant: Obsidian Sensors, Inc.

Inventor： Edward Chan ,  Bing Wen ,  John Hong ,  Tallis Chang ,  Seung-Tak Ryu

IPC: G01J5/24 ,  G01J1/42 ,  G01J1/46 ,  G01J5/02 ,  H04N5/33 ,  G01J1/44 ,  G01J5/80

Abstract: Methods of sensor readout and calibration and circuits for performing the methods are disclosed. In some embodiments, the methods include driving an active sensor at a voltage. In some embodiments, the methods include use of a calibration sensor, and the circuits include the calibration sensor. In some embodiments, the methods include use of a calibration current source and circuits include the calibration current source. In some embodiments, a sensor circuit includes a Sigma-Delta ADC. In some embodiments, a column of sensors is readout using first and second readout circuits during a same row time.