Time digitizer based on delay ring flop-out method and time interval measuring method

Abstract

The invention discloses a time digitizer based on a delay ring flop-out method. The time digitizer comprises a start pulse generation module, an end pulse generation module, a start time delay ring, an end time delay ring, a first edge detection module, a second edge detection module, a phase coherence detector and a cycle index counter. A time sequence trigger pulse is shaped to two needed rotary pulse signals by the pulse generation module, the two raising time delay rotary pulse signals of the two rotary pulse signals are detected to be respectively and circularly transmitted in two time delay rings by the first and second edge detector modules, and the cycle indexes of the rotary pulse signals are counted by the cycle index counter at the same time; when the time interval between the two rotary pulse signals is detected to be less than the resolution of the time digitizer by the phase coherence detector, the two time delay rings are off, therefore, the measurement for the time intervals can be finished, and the product of a value of the cycle index counter and the resolution of the time digitizer is a time interval to be detected. The time digitizer provided by the invention is high in measurement resolution, large in measurement range and high in linearity.

Description

technical field [0001] The invention belongs to the technical field of time interval measurement, and in particular relates to a time-to-digital converter based on a delay loop reduction method and a time interval measurement method thereof. Background technique [0002] High-precision time interval measurement equipment is widely used in basic research and engineering applications, especially in satellite navigation systems, high-precision time-frequency systems, radar systems, and high-precision time scales. Time interval measurement can also be used to measure the period, frequency, jitter and frequency stability of the signal. Time is a basic physical quantity. At present, the domestic time interval measurement technology is relatively backward, and the measurement accuracy is relatively low. The mature time interval measurement accuracy that has been realized is about 100ps (picoseconds). High-precision time interval measurement mainly relies on imported foreign equipme...

AI Technical Summary

Problems solved by technology

The resolution of the time-to-digital converter based on the tapped delay line depends on the delay of a single delay unit. In the parallel delay line method and the delay line matrix method, the delay difference of the delay unit is used to achieve high-precision time interval measurement. And the design is more complicated

The poor consistency of the delay of the delay unit and the large change of the delay with the temperature are the main factors affecting the accuracy of the tapped delay line method, the parallel delay line method and the delay line matrix method

Images