An FPGA-based high-precision and high-integration time-to-digital converter and its implementation method

Abstract

The invention provides a high-precision and high-integrality time-digital converter based on an FPGA (Field Programmable Gate Array), and an implementation method. The time-digital converter comprises a fine time measuring unit, wherein the fine time measuring unit consists of a time alternate sampling unit, a multi-stage sampling data buffering unit and a snapshot and encoding unit. The invention aims to provide the high-integrality precision time-digital converter based on an FPGA. Innovation points lie in that: a fine time measuring part adopts a technology of a latch snapshot and rapid encoding combined architecture based on phase splitting clock alternate sampling, multi-stage sampling data caching and cached multi-stage sampling data. The high-precision and high-integrality time-digital converter has the characteristics of simple structure, design flexibility, high portability, short measuring dead time, large dynamic range, low cost, flexible interface and the like, and can be applied to the fields of aerospace, space research, communication, biomedicine, earth dynamics, relativity research and the like.

Description

technical field [0001] The invention relates to the field of precision time measurement, in particular to an FPGA-based high-precision and high-integration time-to-digital converter and an implementation method thereof. The time-to-digital converter is realized by a field programmable logic device FPGA. Background technique [0002] Time is one of the most basic and important physical quantities in physics. Time refers to the process of an event occurring and ending, the temporal relationship between two or more developmental processes of an event, or the temporal relationship between two or more events. Precision time measurement has important applications in many fields such as aerospace, space research, communication, biomedicine, geodynamics, and relativity research. For example, time-of-flight measurement systems of space high-energy particle spectrometers and plasma spectrometers, time-of-flight mass spectrometers, satellite altimeters, space range finders, space tele...

AI Technical Summary

Problems solved by technology

This patent can achieve high-precision time measurement, but it depends on the special logic resources (carry chain) in the FPGA, which is easily limited by the characteristics and evolution of different series of FPGAs, and the delay of the carry chain as the smallest measurement unit varies with device types, Factors such as ambient temperature, working voltage, and working time change greatly, and the decoding part is also relatively complicated, and the dead time is relatively large

Images