基于CPLD的高精度可调脉冲信号发生器研制

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

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Altera公司的设计软件Quartus II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1 s取样Allan方差为1.84×10-11;产生的时间间隔为100 ns的多路脉冲信号的1 s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-峰值为101 ps,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。

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.