Photon synchronous detection circuit and method of single-photon 3D laser radar detector

Abstract

The invention discloses a photon synchronous detection circuit and method of a single-photon 3D laser radar detector. The detection circuit comprises a RS trigger one RSFF-1, a RS trigger two RSFF-2,a RS trigger three RSFF-3, a RS trigger four RSFF-4, a judgment circuit and a trigger / reset circuit; the judgment circuit is composed of a capacitance network and a comparator CM; the judgment circuitsimultaneously converts avalanche pulse signal number into a certain voltage threshold through a charging / discharging process of the capacitance network, and then compares the voltage threshold VA with the set reference voltage signal Vref through the comparator CMP, thereby realizing synchronous detection and noise suppression functions. The chip layout area occupied by the circuit is small, thefilling factor of the SPAD pixel unit is effectively improved, and the integration degree of the SPAD array detector is improved; the circuit complexity is low, the manufacturing process is completely compatible with the CMOS process, the manufacturing cost is low, the performance consistence among various circuit is good, and the rate of finished product is high.

Description

technical field [0001] The invention provides a photon synchronous detection circuit applied to a single-photon 3D laser radar detector, which belongs to the technical field of single-photon detection and 3D imaging. Background technique [0002] Due to its significant advantages such as high detection sensitivity, fast response speed, small area, low power consumption, and full compatibility with CMOS processes, Single-Photon Avalanche Diode (SPAD) has been used in laser ranging, fluorescence lifetime imaging, DNA Aspects such as sequencing and 3D imaging show broad application prospects. These application fields all require single photon detectors to have good ability to suppress noise. At present, there are mainly two methods for suppressing noise in single photon detectors: gating method and avalanche pulse detection. Although the gated quenching circuit can suppress the ambient photons and SPAD device dark counts within a certain interval, it has the advantage of high...

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Problems solved by technology

[0003] Purpose of the invention: In view of the problems of the existing photon synchronous detection circuit with low ability to suppress environmental photon noise, small application range, and large circuit area, the present invention proposes a single-photon 3D sensor that can change the noise suppression performance, achieve high integration, and wide application range. Photon Synchronous Detection Circuit and Method for LiDAR Detector

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