Time-to-digital converter with gating enabling function

A technology of time-to-digital converters, which is applied to the measurement of electrical unknown time intervals, devices and instruments for measuring time intervals, etc., can solve the problems that do not conform to the development trend of low-voltage and low-power consumption of integrated circuits, the minimum delay of limited delay units, and the inability to Meet the high-precision requirements and other issues, achieve the requirements of ensuring measurement accuracy and measurement range, eliminate measurement errors, and achieve low power consumption

CN109814367AActive Publication Date: 2019-05-28XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-05-28

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Abstract

The invention relates to a time-to-digital converter with a gating enabling function. The time-to-digital converter comprises a ring oscillator circuit, a low-order coding circuit, a high-order counter circuit, a gating signal generating circuit, a monostable pulse generating circuit, a register array circuit and a serial data output circuit. The time-to-digital converter with the gating enablingfunction is adopted as the core of a high-precision time measuring technology, and is widely applied to the fields laser ranging, biological medical treatment, topographic mapping, aerospace and the like. In recent years, the unmanned driving technology is developed rapidly, and laser radar is the key technology applied to the unmanned driving technology. The time-to-digital converter can be applied to the laser radar technology, and serve as a time-to-digital conversion circuit in a large-scale SPAD pixel array, and high-precision wide-range measurement of the time interval is achieved.
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Description

technical field

[0001] The invention belongs to the technical field of digital-analog hybrid integrated circuits, and in particular relates to a time-to-digital converter with a gate enable function. Background technique

[0002] The time-to-digital converter is mainly used to measure the time interval, convert the input analog time interval signal into an output digital signal, and then realize the digitization of the time interval.

[0003] In recent years, the Time of Flight (TOF) ranging method has important applications in military and civilian fields such as 3D imaging, unmanned driving, biomedicine, terrain mapping, and aerospace. In the TOF ranging method, a time-digital converter (Time-Digital Converter, TDC for short) circuit is mainly used to complete the quantitative conversion of the time interval signal. Since the advanced level of these technical fields is closely related to the accuracy of time interval measurement, the requirements for the measurement dynam...

Examples

Embodiment 1

[0078] See Figure 1 to Figure 7 , the present invention provides a time-to-digital converter with gating enable function, such as figure 1 As shown, it includes: ring oscillator circuit, low bit decoding circuit, high bit counter circuit, gating signal generating circuit, monostable pulse generating circuit, register array circuit and serial data output circuit; among them,

[0079] The ring oscillator circuit is used to output the phase node state according to the gating signal (EN signal), and is also used to reset according to the RST signal;

[0080] The low bit decoding circuit is used to output low bit data according to the state of the phase node;

[0081] The high-order counter circuit is used to output high-order data according to the state of the phase node, and is also used to clear according to the RST signal;

[0082] The gating signal generating circuit is used to generate the gating signal (EN signal) according to the SATRT signal and the STOP signal;

[008...