基于DDS的宽带信号源的设计与实现

信号源是通信、电子测控等设备的基础单元,频带宽、精度高、谐波失真小的信号源是设计和制作的难点。本文介绍一种电压控制LC振荡器设计方法,采用直接数字频率合成技术(DDS),选取高稳定度晶体振荡器做参考源,通过频谱搬迁,使电压控制LC振荡器达到了大于倍频程的输出带宽,频率范围从10MHz^40MHz,输出频率步进间隔为1M±1Hz,波形失真小,稳定度优于10-6。

Broad band signal generator is an important unit in communication system and electronic measurement and control. There are many difficulties in its designing and making. This article introduces a new signal generator developed by using direct digital synthesis （DDS） techniques and the generator has high frequency resolution and broad band from10MHz to 40MHz. This article also describes the design and the application of the hardware and software.