Time-digital converter and error calibration device and method thereof

Abstract

The invention belongs to the technical field of time measurement, and provides a time-digital converter and an error calibration device and method thereof. The error calibration method comprises the steps that the error calibration device which comprises a sampling control module, a statistic module, and a time interval calibration module is adopted, under a calibration mode, a time-digital conversion module outputs multiple calibration sampling values to the statistic module under the control of the sampling control module, and the sampling control module outputs a total number of times for sampling to the statistic module; the statistic module conducts error calibration on delay time of each delay unit in the time-digital conversion module according to the multiple calibration sampling values and the total number of times for sampling so that the time interval calibration module can calculate an interval value of time to be detected according to the sampling values and calibration data under a measurement mode, thus the measurement accuracy of the time-digital converter is improved, and the problem that the measurement accuracy of an existing time-digital converter is low due to the fact that there is difference between the delay time of each delay unit and the response speed of each trigger is solved.

Description

technical field [0001] The invention belongs to the field of time measurement, in particular to a time-to-digital converter and an error calibration device and method thereof. Background technique [0002] Time to digital converter (time to digital converter, TDC) technology is essentially to solve the problem of ultra-short time interval measurement. At present, physical quantities (such as capacitance, resistance, weight, density, pressure, etc.) TDC has a good application prospect in aspects such as measurement and phase difference measurement. [0003] Existing time-to-digital converters based on delay loops include a plurality of delay units, a plurality of flip-flops corresponding to the plurality of delay units, and decoders (such as figure 1 shown). When the time interval starts, the rising edge of the start pulse signal corresponding to the time interval is sequentially transmitted in multiple delay units; when the time interval ends, the stop pulse signal corres...

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Problems solved by technology

[0006] The object of the present invention is to provide a time-to-digital converter and its error calibration device and method, aiming to solve the problems existing in the existing time-to-digital converters due to the differences in the delay time of each delay unit and the response speed of the trigger. The problem of low measurement accuracy caused by

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