Photon synchronous detection circuit applied to single-photon flight time ranging system, and preparation method thereof

Abstract

The invention discloses a photon synchronous detection circuit applied to a single-photon flight time ranging system, and a preparation method thereof. The invention belongs to the technical field oflaser ranging and 3D imaging. The photon synchronous detection circuit comprises a T trigger TFF_1, a T trigger TFF_2, a T trigger TFF_3, a T trigger TFF_4, a tree-type judgment circuit and a reset circuit. The photon synchronous detection circuit disclosed by the invention is suitable for the situation of a relatively small avalanche response time interval of devices in a pixel unit or simultaneous response; the grade of noise suppression performance can be changed according to the strength of the noise by setting the control level; and the photon synchronous detection circuit disclosed by the invention is novel and simple to implement, no large-area trigger component needs to be used, the main tree-type judgment circuit is connected by a simple gate circuit only, so that the complexity is low, the manufacturing process is completely compatible with the CMOS process, the manufacturing cost is low, the performance consistency between the circuits is good, the yield is high, moreover, the main part of the photon synchronous detection circuit disclosed by the invention is implemented by a digital circuit, the detection result has higher accuracy and precision, and the circuit has very high stability and reliability.

Description

technical field [0001] The invention belongs to the technical field of laser ranging and 3D imaging, and provides a photon synchronous detection circuit applied to a single-photon time-of-flight ranging system and a preparation method thereof. Background technique [0002] Due to its significant advantages such as high sensitivity, high detection efficiency, high time resolution, low power consumption and full compatibility with CMOS technology, single-photon avalanche diodes (SPADs) are used in single-photon time-of-flight ranging and 3D imaging, etc. The technical field has broad application prospects. However, in the application of single-photon time-of-flight ranging, the SPAD device is seriously affected by the ambient photon noise when detecting the photons of the laser echo. When the traditional window and door method is used, when the photon noise in the external environment is large, the avalanche response interval of the device in the pixel unit is short or when t...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of existing photon synchronous detection circuit with complex structure, difficult manufacture and insufficient detection accuracy. The present invention proposes a photon synchronous detection circuit with simple circuit structure, low cost and high precision and its preparation method. Single Photon Time-of-Flight Ranging

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