基于FPGA的虚拟通用计数器/信号源集成

Virtual Integration of Universal Counter and Signal Source Based on FPGA's

将通用计数器与信号源集成于FPGA内,借助EPP实现与PC机的通信,以Delphi实现虚拟图形化界面。采用等精度等测量技术和余数插补法,虚拟地实现2个通道0.1Hz～10MHz信号的频率、周期、占空比、脉宽、计数及其频率比、相位差、时间间隔测量,1个扩展通道10MHz～1GHz信号的频率、周期、计数测量,和1个通道频率、占空比、幅度、直流分量步进可调的矩形波(1Hz～1MHz)、正弦波(1Hz～16kHz)等信号的产生。重点介绍了其系统EDA设计、仿真及实验结果。实验表明,本设计是切实可行的。

A virtual integrated instrument is presented,in which universal counter and signal source are integrated in FPGA's.Using equal precision technology,measurement of 0.1 Hz-10 MHz signals in two channels is made for its frequency,cycle,duty cycle,count,pulse-width,frequency ratio,phase difference and time interval,and 10 MHz-1 GHz signals in an extended channel is also measured for its frequency,cycle and count.Cycle signals,such as sine waves(1 Hz-16 kHz),rectangular waves(1 Hz-1 MHz)with output frequency,cycle duty,amplitude and DC component adjustable,are generated using remainder insertion compensation method.Results from the experiment show that the design is feasible.