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Short interval measurement method based on special programmable input and output delay unit

A technology of interval measurement and short time, which is applied in the direction of electrical unknown time interval measurement, devices and instruments for measuring time interval, etc., which can solve the problems of environmental temperature sensitivity, easy to be disturbed by external disturbance, long conversion time, etc., and save area and cost , high measurement accuracy, and simple structure

Inactive Publication Date: 2011-02-16
XIDIAN UNIV
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Problems solved by technology

This is not only because analog methods are very sensitive to ambient temperature, but also because they require relatively long conversion times, are easily affected by external disturbances, and are difficult to integrate

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  • Short interval measurement method based on special programmable input and output delay unit
  • Short interval measurement method based on special programmable input and output delay unit
  • Short interval measurement method based on special programmable input and output delay unit

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Embodiment Construction

[0015] The invention proposes a FPGA-based high-precision short-time interval measurement method. The measurement method adopted by the present invention is the vernier delay line method. Measuring circuit as attached figure 1 shown. The delay unit is implemented by the IODELAY design unit existing in the FPGA devices of the Virtex series.

[0016] Each I / O module of Virtex-5 series and Virtex-4 series FPGAs contains a programmable absolute delay unit called "IODELAY". It can be connected to ILOGIC, ISERDES & OSERDES modules, or both modules at the same time. IODELAY is a delay unit with 64 taps, and each tap can accurately delay 78ps. The reason is that IODELAY is driven by an independent high-precision reference clock source outside the FPGA device, and is not affected by the voltage and temperature changes of the FPGA chip itself. By selecting the IDELAYCTRL reference clock within the range specified in the "Virtex-5 Data Sheet", the delay resolution of the tap can be ...

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Abstract

The invention discloses a short internal measurement circuit which is realized in a Xilinx FPGA element and comprises N (for example N=100) D triggers, two delay chains consisting of special programmable input and output delay units (IODELAY), a short interval stop signal and a short interval stop signal. The invention also provides a short interval measurement method which comprises the step of: regulating delay tap values of the two IODELAY chains in the short interval measurement circuit to ensure that all delay units of the two delay chains have uniform delay and stable delay differences. Because the IODELAY chain structure is adopted in the invention, the interval measurement with higher accuracy can be realized. The invention has the advantages of simple structure, cost saving and short development cost, and is convenient to update and upgrade.

Description

Technical field: [0001] The invention relates to a precise time interval measurement method, specifically a high-precision time interval measurement method based on a hardware platform of an FPGA (Field Programmable Gate Array) device. Background technique: [0002] Time interval measurement technology is widely used in scientific experiment research and engineering practice. Accurate time interval measurement technology, especially the measurement technology of picosecond level is more important. In engineering practice, it is mainly used for time synchronization technology, satellite navigation and positioning, laser ranging, synchronization of communication network and demodulation of angle modulation signal in communication. The application in scientific experiments is mainly reflected in the application in high-energy physics experiments, such as the measurement of flight time in high-energy physics experiments. The main function of the time-of-flight counter is to me...

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Application Information

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IPC IPC(8): G04F10/00
Inventor 王海张敏姚秦范慧娟刘杰王俭曾宪雄
Owner XIDIAN UNIV
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