高分辨率程控宽带信号源的设计

Design of High Resolution Programmable Wide Band Signal Generator

本文在分析目前DDS信号源存在问题的基础上,提出了一种新型的设计方案,该方案以FPGA与单片机为核心,利用高速和低速相互配合产生高分辨率宽带多路DDS信号源,FPGA利用高速性能产生波形,单片机负责接收命令经过简单的解析之后通过串口和FPGA进行通信,FPGA按照单片机的命令产生方波、三角波、正弦波等波形,其中频率最大可达5MHz,频率的精度可以达到1Hz,为了提高系统的显示度,各种波形的形状和参数通过和单片机相连的LCD液晶显示出来。实践证明,该波形发生器结构简单、功能灵活,并具有在线可重复编程的特点。

In the paper put forward a new design scheme On the basis of analysis of the current DDS signal source based on the existing problems, which is consisted of FPGA and MCU. High resolution and wide band multi-channel DDS signal source generated by cooperation of high speed and low speed, the FPGA high speed performance of the waveform, the monolithic machine is responsible for receiving orders after a simple analysis through the serial port communication and FPGA, FPGA in accordance with the MCU command generation Fang Bo, triangle wave, sine wave waveform, the frequency of up to 5 MHz, the frequency accuracy can reach 1 Hz, in order to improve the display system, all kinds of waveform shape and parameters and through the LCD display is connected to the microcontroller LCD. It is proved by practice that the waveform generator is simple in structure, flexible in function, and has the characteristics of on-line and repeatable programming.