SYSTEM AND METHOD FOR CONTROLLING EXCESS BIAS OF SINGLE PHOTON AVALANCHE PHOTO DIODE

摘要

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.

主权项

1. A system for controlling an excess bias of a single photon avalanche photo diode (SPAD), comprising:
a power supply generating a supply voltage; a SPAD having a first terminal and a second terminal, the first terminal receiving the supply voltage, the second terminal generating an output voltage signal; a control circuit connected to the second terminal of the SPAD, wherein the control circuit obtains a reset level according to a swing of the output voltage signal and an excess bias level; and a load having a first terminal and a second terminal, the first terminal of the load connected to the second terminal of the SPAD, the second terminal of the load connected to the control circuit for receiving the reset level.