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Research and Implement of Precise Time-interval Measurement Based on FPGA

Author: ZouJinBo
Tutor: LiBaiPing
School: Xi'an University of Science and Technology
Course: Communication and Information System
Keywords: FPGA Time Interval Measurement Differential delay interpolation Delay line
CLC: TN791
Type: Master's thesis
Year: 2011
Downloads: 171
Quote: 1
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Abstract


With the rapid development of technology , people 's demand for high-precision time and frequency increasing , the traditional bell system can tame ( automatic frequency calibration system ) is an analog or semi- digital system , the time difference measurement unit using high-precision time interval counter , high cost, difficult to debug and difficult to model other shortcomings. Development of microelectronics technology , and promote the development of programmable logic technology , the emergence of low cost, suitable for engineering applications, field programmable logic devices (FPGA), so the use of FPGA to achieve high-precision time interval measurement has great practical significance. This paper analyzes several traditional time interval measurement method, in-depth study of the delay units in the FPGA implementation methods, and events delay interpolation , interpolation clock delay and differential delay interpolation three kinds of temporal interpolation method the simulation results show that the differential delay line based on the highest resolution measurements and consumes minimal hardware resources . On this basis , at Altera Corporation CycloneII series EP2C70F672C8 chip to achieve a resolution of 43ps differential delay chain , using the combined thickness of the measurement program , designed an integrated within the FPGA high-precision time interval measurement module . Design mainly includes four parts: the system clock module, coarse measurement unit , fine measurement unit , data processing and data transmission module and Quartus9.0 VerilogHDL language development environment through the module software. Finally experimental platform to build on this program specific test results show that the FPGA-based time interval measurement accuracy of 200ps, with high precision , high integration, easy to transplant characteristics, is a better design , with good application prospects.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Digital circuits > Logic circuits
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