Time digital converter, error correcting device and error correcting method

Abstract

The invention belongs to the technical field of a time digital converter and provides a time digital converter, an error correcting device and an error correcting method. In the invention, the error correcting device which comprises a control module, a storage module, a calculation module and a correcting module is adopted; the control module is used for respectively outputting a start pulse signal, a first stop pulse signal and a second stop pulse signal at a first rising edge, a second rising edge and a third rising edge of a reference clock signal; the time digital converter is used for outputting a first time measured value and a second time measured value according to the three pulse signals; the storage module is used for storing the first time measured value and the second time measured value; the calculation module is used for calculating a gain error and an offset error of the time digital converter according to the two time measured values; the correcting module is used for correcting the errors of the time measured values of the time digital converter according to the gain error and the offset error. The problem of low measurement precision caused by Gain error and Offset error of the present TDC can be solved.

Description

Technical field [0001] The invention belongs to the technical field of time-to-digital converters, and particularly relates to a time-to-digital converter and an error calibration device and method thereof. Background technique [0002] The time to digital converter (TDC, time to digital converter) technology is essentially to solve the problem of ultra-short time interval measurement. Its history can be traced back to high-energy physics experiments. The inquiry of element particles requires powerful experimental equipment. When analyzing experimental data, time measurement occupies a very important part. At present, in medical imaging instruments, laser rangefinders, ultrasonic flow meters, ultrasonic density meters, ultrasonic thickness meters, magnetostrictive positioning, and sensor applications, physical quantities (such as capacitance, resistance, weight, density, pressure, etc.) are converted into frequencies And the measurement after phase difference, TDC has very good ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a time-to-digital converter and its error calibration device and method, aiming to solve the problem of low measurement accuracy caused by Gain error and Offset error in the existing TDC

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