公开(公告)号：US09823123B2

公开(公告)日：2017-11-21

申请号：US14753968

申请日：2015-06-29

Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Inventor： Chia-Ming Tsai ,  Po-Hsuan Chang ,  Ming-Ching Kuo ,  Tzu-Yi Yang

IPC: H01J40/14 ,  G01J1/44

CPC classification number: G01J1/44 ,  G01J2001/442 ,  G01J2001/4466

Abstract: A system for controlling excess bias of a single photon avalanche photo diode (SPAD) is provided. The system includes a power supply, a SPAD, a control circuit and a load. The power supply generates a supply voltage. The SPAD has a first terminal receiving the supply voltage and a second terminal generating an output voltage signal. The control circuit is connected to the second terminal of the SPAD. The load has a first terminal connected to the second terminal of the SPAD, and a second terminal connected to the control circuit for receiving a reset level. The control circuit is capable of monitoring a swing of the output voltage level and generating the reset level in response to the excess bias level and the swing of the output voltage level.