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Time-to-digital conversion circuit applied to SPAD detector

A time-to-digital conversion and detector technology, which is used in time-to-digital converters, devices for measuring time intervals, and electrical unknown time interval measurement, etc. The converter circuit structure is complex and other problems, to achieve the effect of simple circuit structure and high time resolution

Inactive Publication Date: 2020-02-07
苏州超锐微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the existing technology, the circuit structure of the traditional analog-to-digital converter is complex, and the conversion speed and conversion accuracy are not high; the existing time-to-digital conversion circuit technology, the circuit structure design is not simple enough, and the time resolution is difficult to reach several picosecond level

Method used

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  • Time-to-digital conversion circuit applied to SPAD detector
  • Time-to-digital conversion circuit applied to SPAD detector

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] Such as figure 1 Shown is the structural representation of the time-to-digital conversion circuit provided by the present invention, using a series of buffers and D flip-flops, consisting of two delay chains up and down by the buffers, wherein each stage buffer output of a delay chain is connected to a The input terminal D of the D flip-flop, the output of each stage buffer of the other delay chain is connected to the clock input terminal of the corresponding D flip-flop, and the output terminal Q of the D flip-flop is a digital signal output terminal, which is used to represent the time interval length.

[0014] The delay time of the two delay chains is different, and the delay chain with a relatively long delay time is used as the start signal, that is, the input delay chain of the start signal, and the delay chain with a relatively short delay time is used a...

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Abstract

The invention discloses a time-to-digital conversion circuit applied to an SPAD detector. A series of buffers and D triggers are adopted, and the conversion from a time signal to a digital signal is achieved through the principle of a vernier caliper. In the time-to-digital conversion circuit, a start signal and a stop signal are respectively transmitted on two delay chains with different delay speeds; a start signal of each stage transmitted by the corresponding buffer is connected with an input end D of one D trigger, and each stage of each stage transmitted by the corresponding buffer is connected with a clock input end of the corresponding D trigger, wherein an output end Q of the D trigger is a digital signal output end.

Description

technical field [0001] The invention relates to a time-to-digital conversion circuit applied to a SPAD detector, that is, a TDC circuit, which belongs to the field of integrated circuits. Background technique [0002] A time-to-digital converter is a conversion circuit that converts an analog quantity of time into a digital signal for measuring time intervals. With the rise of photon time-of-flight (TOF) technology in the field of laser ranging, the time-to-digital converter has become increasingly important and has gradually become a key technology. The resolution of the time-to-digital converter directly determines the ranging accuracy of laser ranging. High-precision ranging requirements are indispensable in many applications. For example, in the docking application of spacecraft, the ranging accuracy is required to reach the order of millimeters, and the corresponding time interval accuracy is required to reach the level of several picoseconds. [0003] Single photon a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04F10/00H03K3/037
CPCG04F10/005H03K3/037
Inventor 毛成卜晓峰孔祥顺吴俊辉
Owner 苏州超锐微电子有限公司