Time digital converter based on antifuse field programmable gata array (FPGA) and temperature drift correcting method thereof

Abstract

The invention discloses a high-precision time digital converter based on antifuse field programmable gata array (FPGA) and a temperature drift correcting algorithm thereof. The time digital converter based on antifuse FPGA is divided into two parts: (1) carrying out rough time measuring by means of a counting method; (2) achieving time interpolation by means of carry cascade connection in the FPGA, namely achieving fine time measuring by means of an interpolation method, and correcting a measuring result of the fine time according to the operating ambient temperature of the FPGA combined with temperature drift correcting algorithms when the measuring are completed, and therefore measurement accuracy of time digital converter in a large temperature range can be guaranteed. The digital converter based on antifuse FPGA and temperature drift correcting method thereof are characterized by comprising the following steps: achieving rough counting measuring by utilizing a high-speed counter which works under master clock, measuring fine time by means of the carry cascade connection to achieve time interpolation, calibrating the least significant bit (LSB) of the time digital converter, and obtaining a function relation of the LSB with temperature changes, and correcting fine time measuring results according to the function relation and integral nonlinearity of the time digital converter.

Description

Technical field [0001] The invention relates to the field of high-precision time measurement, in particular to a time-to-digital converter based on an anti-fuse FPGA and a temperature drift correction method thereof. Background technique [0002] With the rapid development of aerospace in recent years, high-precision time measurement has been widely used in aerospace, space research and other fields with strong radiation, such as space high-energy particle spectrometer and plasma spectrometer time-of-flight measurement system , Satellite altimeter, space rangefinder, space telemetry, time calibration in the field of quantum communication, etc. In these special applications, high-precision time measurement devices must have strong anti-radiation performance, and for different applications, there are different requirements for time measurement accuracy, dead time, time measurement dynamic range and other parameters. In the above-mentioned application fields, a high-precision time-...

AI Technical Summary

Problems solved by technology

[0007] If a dedicated ASIC chip is to be used in the field of aerospace and space research, it needs to spend a lot of research and development funds, and it needs to go through a lot of radiation tests to verify its radiation resistance performance, and the research and development cycle is very long.

At the same time, as a special ASIC chip for time measurement, its function is fixed, and it can only be designed according to its function in actual use, and it is often only suitable for some specific research tasks, so it has poor flexibility and is not suitable for certain certain occasions

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