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Analog signal reading method for single photon avalanche diode detector

A single-photon avalanche and analog signal technology, applied in the direction of instruments, can solve the problems that are difficult to realize accurately, and achieve the effect of large counting dynamic range, simple structure, and improved counting dynamic range

Inactive Publication Date: 2013-07-17
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the gate pulse quenching requires the photon signal to be completely synchronized with the gate pulse signal, which is difficult to achieve accurately, and it only eliminates the dark count within the pulse time, and finally a small amount of dark count signal is sent to the readout circuit

Method used

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  • Analog signal reading method for single photon avalanche diode detector
  • Analog signal reading method for single photon avalanche diode detector
  • Analog signal reading method for single photon avalanche diode detector

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Embodiment 1

[0026] (1) According to the SPAD detector analog signal readout method that the present invention proposes, design as follows image 3 The specific circuit shown includes 6 PMOS transistors (M1, M3, MQ1, MQ2, MQ3, MQ4), 8 NMOS transistors (M2, M4, M5, MN1, MN2, MN3, MN4, MN5) and 1 capacitor (C). 5 MOS switches (M1, M2, M3, M4, M5), they are respectively controlled by the signals switch1~switch4, the timing diagram of the control signals of switch1, switch2, switch4 is as follows image 3 As shown, swich3 determines the counting mode. The specific reading method and process are as follows:

[0027] (1) Reset stage: before photon signal detection, switch1 is at low level, switch tube M1 is closed, the lower plate of capacitor C is connected to the power supply, capacitor C is charged, and after a period of time, the voltage at both ends of capacitor C is reduced Charge to the power supply voltage value. In the reset phase, both switch2 and switch4 are at low level, the swit...

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Abstract

The invention provides an analog signal reading method in terms of a single photon avalanche diode (SPAD) detector. The analog signal reading method comprises three successive processes of resetting, counting and signal reading. During the resetting, a capacitor is firstly charged to the power source voltage. During the counting after the resetting, a counting circuit counts for once every time an avalanche pulse signal generated by the SPAD detector is input, and charges on the capacitor are discharged for once. During a period of counting, the voltage changing value on the capacitor is proportional to changing of the quantity of photons detected by the SPAD detector during the time, and the number of the photons detected by the SPAD can be calculated. The signal reading stage can be entered after counting is finished, and the voltage value on the capacitor can be read through a voltage follower. Additionally, counting and reading of the analog signals can be performed for twice before and after exposure of the detector, and influence of dark counting can be eliminated by subtracting the analog signals read in two times to obtain accurate photon counting.

Description

technical field [0001] The invention relates to the field of diode detectors, in particular to an analog signal readout method of a single photon avalanche diode detector. Background technique [0002] In recent years, imaging technology based on Charge Coupled Device (CCD, Charge Coupled Device) and CMOS Active Pixel Image Sensor (CMOS APS, Active Pixel Sensor) has made great progress, but with the development of quantum information technology, this The imaging speed and pixel sensitivity of traditional imaging technologies have encountered great challenges. More and more fields need to detect and process extremely weak high-frequency optical signals, and single-photon detection has gradually become a research hotspot at home and abroad. [0003] Single photon avalanche diode detector (Single Photon Avalanche Diodes, SPAD) is a kind of avalanche photodiode in the "Geiger" working mode. The SPAD detector has two characteristics of single photon signal detection and picoseco...

Claims

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Application Information

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IPC IPC(8): G01J11/00
Inventor 徐跃郭宇锋岳恒赵菲菲
Owner NANJING UNIV OF POSTS & TELECOMM
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