基于DSP+CPLD的高精度信号发生器

A High Accuracy Signal Generator Based on DSP and CPLD

介绍了基于直接数字式频率合成 (DDS)原理的全数字信号发生器 (DSP) ,利用DSP芯片快速、高精度的运算优势以及CPLD芯片灵活的编程逻辑、大容量存储功能的特点 ,采用通用可编程芯片以及数字波形合成技术 ,形成高稳定、高精度、高动态的数字合成信号。该信号发生器可产生 0～2 5kHz的正弦波、三角波和方波 ,输出电压峰峰值为 0～ 5V ,频率步进 1Hz ,幅度步进 0 .0 0 1V。

In this paper, an all digital signal generator based on the principle of direct digital frequency synthesis(DDS) is presented. The universal programmable chip and digital waveform synthesis technique are used to generate a high stability, high accuracy, high dynamic rarge digital synthesised signal, by utilizing the fast, high accuracy operational characteristic of DSP and flexible programmable logic, high capacity memory of CPLD, it can generate a high stability, high accuracy, high dynamic range digital synthesised signal with the universal programmable chip and digital waveform synthesis technique.