基于DDS的可程控信号源的设计和实现

基于AD7008和AD7520芯片设计了一个可程控信号源,只需通过电脑设置发送控制命令参数,就能够产生频率和幅度符合要求的数字检测信号。详细介绍了该方案的软件和硬件的设计要点以及在调试中应注意的问题。调试结果及实际应用表明该信号源工作稳定,精度较高,频率、幅度控制都非常便利,在电子设备的电路板故障检测中起到了很好的作用。

Design and implementation of programmable signal source based on DDS

A programmable signal source with AD7008 chip and AD7520 chip was designed. By sending the control com-mand parameters through PC settings,the digital detection signal meeting the requirements of frequency and amplitude can be generated. The key points of the software and hardware design on the program and their debugging cautions are introduced in this paper. The debugging results and actual application prove that the signal source works stable,and has high accuracy,conve-nient frequency and amplitude control. It has played a important role in fault detection of circuit boards.