基于CPLD的高精度可调脉冲信号发生器研制

为满足精密时间间隔测量设备的测试需要，研制了一种时间间隔可调的高精度脉冲信号发生器。利用计算机串口控制的方式，结合复杂可编程逻辑器件（CPLD）集成度高、可靠性好及工作速度快的优点，采用A1tera公司的设计软件QuartusII进行设计仿真及实现。仿真与实测实验表明，该脉冲信号发生器不仅可以产生单路可调脉冲信号，而且能产生多路可调脉冲信号，产生的单路秒脉冲信号的1s取样Allan方差为1．84×10^-11；产生的时间间隔为100ns的多路脉冲信号的1s取样Allan方差为2．36×10^-11，2路信号之间的时间间隔数据系列的峰一峰值为101ps，可以满足多通道时间间隔测量设备测试要求的稳定度与准确度。

Development of an adjustable high-precision pulse signal generator based on CPLD

To meet the test requirement of the precise time interval measurement equipments, we designed a phase-adjustable high-precision pulse signal generator. In the design, simulation and hardware-implementation, the computer serial port control mode was adopted, the complex programmable logic device （CPLD）, which has the advantages of high level of integration/good reliability/fast operating speed, was utilized, and the Altera＇s Quartus II software was adopted. The result of simulation and experiment shows that the pulse signal generator can not only generate a single adjustable pulse signal, but also generate the multi-channel adjustable pulse signals. The Allan（r= 1 s） for the single 1PPS signal is 1.84 ×10^-11, the Allan variance（r= 1 s） for the multi-channel pulse signals with a time interval of 100 ns is 2.36×10^-11, and the peak-peak value of the time interval data series for two channels of signal is 101 ps. This pulse signal generator can meet the needs of the multi-channel time interval measurement equipment in stability and accuracy.