基于可编程逻辑器件CPLD和直接数字频率合成技术（DDS）的三相多波形函数发生器-based CPLD and direct digital frequency synthesis (DDS) over the three-phase waveforms letter Number Generator

摘要：介绍了基于可编程逻辑器件CPLD和直接数字频率合成技术（DDS）的三相多波形函数发生器的基本原理，并在此基础上给出了基于CPLD的各模块设计方法及其VHDL源程序-Abstract : Based on the CPLD and direct digital frequency synthesis (DDS) of a three-phase multi-function waveform Generator to the basic principles and on this basi

The output frequency requirements for the three waveforms are: the frequency range is adjustable between 20Hz-20kHz; the phase difference between the three waveforms is 120 degrees. A. of sine wave signal: step 10Hz; frequency stability: better than