System and method for controlling excess bias of single photon avalanche photo diode
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01J-040/14
G01J-001/44
출원번호
US-0753968
(2015-06-29)
등록번호
US-9823123
(2017-11-21)
우선권정보
TW-104103182 A (2015-01-30)
발명자
/ 주소
Tsai, Chia-Ming
Chang, Po-Hsuan
Kuo, Ming-Ching
Yang, Tzu-Yi
출원인 / 주소
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
대리인 / 주소
Birch, Stewart, Kolasch & Birch, LLP
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
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 ge
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.
대표청구항▼
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 s
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 which is inputted to the control circuit; anda 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. 2. The system for controlling the excess bias according to claim 1, wherein a cathode terminal of the SPAD receives the supply voltage, and an anode terminal of the SPAD generates the output voltage signal. 3. The system for controlling the excess bias according to claim 2, wherein the control circuit comprises: a sampling and holding circuit obtaining an extreme voltage level according to the swing of the output voltage signal, the extreme voltage level being taken as a quenching level; anda level shifter receiving the excess bias level and subtracting the excess bias level from the quenching level to obtain the reset level. 4. The system for controlling excess bias according to claim 3, wherein the control circuit includes a voltage regulator receiving the reset level and enhancing an output driving ability of the control circuit, such that the second terminal of the load quickly settles at the reset level. 5. The system for controlling the excess bias according to claim 2, wherein the control circuit comprises: a level shifter receiving the output voltage signal and the excess bias level, and subtracting the excess bias level from the output voltage signal to obtain a first voltage signal; anda sampling and holding circuit obtaining an extreme voltage level according to the swing of the first voltage signal, the extreme voltage level being taken as the reset level. 6. The system for controlling excess bias according to claim 5, wherein the control circuit includes a voltage regulator receiving the reset level and enhancing an output driving ability of the control circuit, such that the second terminal of the load quickly settles at the reset level. 7. The system for controlling the excess bias according to claim 1, wherein an anode terminal of the SPAD receives the supply voltage, and a cathode terminal of the SPAD generates the output voltage signal. 8. The system for controlling the excess bias according to claim 7, wherein the control circuit comprises: a sampling and holding circuit obtaining an extreme voltage level according to the swing of the output voltage signal, the extreme voltage level being taken as a quenching level; anda level shifter receiving the excess bias level and adding the quenching level and the excess bias level together to obtain the reset level. 9. The system for controlling excess bias according to claim 8, wherein the control circuit includes a voltage regulator receiving the reset level and enhancing an output driving ability of the control circuit, such that the second terminal of the load quickly settles at the reset level. 10. The system for controlling the excess bias according to claim 7, wherein the control circuit comprises: a level shifter receiving the output voltage signal and the excess bias level, and adding the output voltage signal and the excess bias level together to obtain a first voltage signal; anda sampling and holding circuit obtaining an extreme voltage level according to a swing of the first voltage signal, the extreme voltage level being taken as the reset level. 11. The system for controlling excess bias according to claim 10, wherein the control circuit includes a voltage regulator receiving the reset level and enhancing an output driving ability of the control circuit, such that the second terminal of the load quickly settles at the reset level. 12. The system for controlling the excess bias according to claim 1, further comprising a quenching reset circuit, wherein the quenching reset circuit receives the output voltage signal and controls the first terminal of the load and the second terminal of the load to be opened. 13. The system for controlling excess bias according to claim 12, wherein the control circuit includes a voltage regulator receiving the reset level and enhancing an output driving ability of the control circuit, such that the second terminal of the load quickly settles at the reset level. 14. A method for controlling an excess bias of a single photon avalanche photo diode (SPAD), comprising: controlling a SPAD being operating at a Geiger mode, wherein a first terminal of the SPAD is connected to a power supply, a second terminal of the SPAD generates an output voltage signal, a first terminal of a load is connected to the second terminal of the SPAD, and a second terminal of the load receives a reset level;inputting an excess bias level;monitoring a swing of the output voltage signal and obtaining the reset level according to the swing of the output voltage signal and the excess bias level, when the SPAD induces a sensing current; andproviding the reset level to the second terminal of the load. 15. The method for controlling the excess bias according to claim 14, further comprising: monitoring the swing of the output voltage signal generated by the SPAD, and obtaining an extreme voltage level being taken as a quenching level; andadding the quenching level and the excess bias level together to obtain the reset level. 16. The method for controlling the excess bias according to claim 14, further comprising: adding the output voltage signal generated by the SPAD and the excess bias level together to obtain a first voltage signal; andmonitoring a swing of the first voltage signal, and obtaining an extreme voltage level taken as the reset level.
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