基于CPLD的高精度可程控多路信号源

High Accuracy Programmable Multi-signal Source Based on CPLD

提出了一种利用可编程逻辑器件CPLD和高精度多通道D/A转换器DAC7644构成的高精度多路信号源的原理方案和实现方法,通过CPLD的逻辑功能配置,使所有信号通道的波形数据存贮器共享。存贮器采用双总线控制方式,从而实现对输出信号频率、相位和幅值的控制,并且不同通道可以输出不同性质的信号。CPLD、数据存贮器共享、双总线控制等技术,使硬件系统结构简单,信号拟合点数多,波形平滑、失真度小。

A method of high accuracy programmable multi-signal source was presented,which mainly consists of complex programmable logic device(CPLD)and high accuracy multi-channel D/A converter DAC7644.All the channels use the common data memory via the special logic function configured in CPLD.Bi-bus control mode for data memory control the signal frequency,phase angular and amplitude.Based on the technology of CPLD,common memory and bi-bus control,the signal source has the characteristics of simple hardware,more signal smooth signal and low distortion,etc.