Design Of Time Interval And Signal Parameter Measurement Module

Time interval measurement technology has a very important application in many fields,such as high energy physics experiment,radar recognition,integrated circuit and so on.It is the basis for the development of time interval measurement instruments,such as timer,time-interval analyzer,high-precision timer plays an important role in the field of electronic measuring instruments.Therefore,this paper proposes to design a time interval and signal parameter measurement module,which has a function of highprecision time measurement,voltage and pulse parameters.This module equipped with upper computer and other software functions can be formed a complete time interval and signal parameter measuring instrument.The main work of this paper as follows:1.Aulthor proposes a high precision time interval measurement scheme based on TAC by analyzing the advantages and disadvantages of traditional time interval measurement methods.At the same time,analyzing the basic principle of signal parameter measurement and according to the actual requirements of the project,proposes a signal parameter measurement scheme,which based on "DAC + high-speed comparator" on the hardware architecture platform of time-interval measurement,in this way,on the basis of realizing high-precision signal parameter measurement,less hardware resources are consumed,making the measurement module integration degree higher.Analyzing the error of interpolation circuit,author designs a self-correction algorithm to reduce the influence of temperature and voltage.2.Selecting the key devices on the basis of the overall hardware scheme.Hardware circuit design mainly includes the design of shaping circuit,interpolation circuit,relay control circuit and other units.The waveform transformation circuit is used for signal conversion and parameter measurement,the interpolation circuit is used for time amplitude conversion and the fore-end channel control part circuit is used to complete the measurement of signal parameters.A detailed design process is given for each hardware unit.3.Logic circuit design and implementation.The functional modular design idea is adopted to complete the overall scheme design of the logic architecture based on the actual requirements of the project,which mainly includes: time interval measurement unit,voltage measurement unit,pulse time domain parameter measurement unit,peripheral device configuration and data transmission unit,etc.In the time interval logic unit design,the delay chain is designed to meet the time interval measurement index requirements for measuring zero delay,extracting the time pulse and narrow time based on logic gate circuits.Measurement data integration and transmission logic design are completed according to the generation time sequence of data flow.Aulthor designs the delay self-calibration logic and calibration algorithm to reduce the influence of the delay fluctuations,improving the time measurement accuracy and stability of the module.The designed measurement module is analyzed and calculated for the uncertainty of time parameters and voltage parameters,a test platform is set up to verify the functional indicators of the module.The test results show: The time interval resolution of the measurement module meets the requirement of 100 ps index,range from 0 ns to10 s with a better precision of 150ps;The voltage resolution meets the requirements of3 m V index,and the accuracy is better than 20 m V;The rise / down time measurement accuracy is better than 150 ps,and the positive / negative pulse width measurement accuracy is better than 150 ps.