基于DDS技术的多路电气隔离程控信号源  

A programmable multi- routing electrical isolated signal generation system based on DDS technology

作　　者：李嘉楠[1] 谢雪松[1] 张小玲[1] 陈君[1] 哈悦 

机构地区：[1]北京工业大学电子信息与控制工程学院,北京100124

出　　处：《电子技术应用》2016年第2期53-56,共4页Application of Electronic Technique

摘　　要：为了解决实际军工测试中需要遥测多达几百路的被测信号来完成对遥测信号的调理和动态校准,基于直接数字频率合成技术（DDS）设计了一种多路电气隔离型的程控信号源,为遥测系统提供模拟激励信号。用户通过上位机人机交互界面完成对下位机模拟激励信号源的参数设置,经485总线通信使下位机自动产生多种波形,最多实现128路相互电气隔离通道中的一路或多路独立输出。信号源的频率范围为0~8 kHz,波形幅值能达到70 VP-P,精度达到±0.2%FS,具有高精度及多用途性,应用前景广泛。To complete condition and dynamic calibration for the telemetry signal, the military needs to telemetry hundreds of mea-sured signal. Purpose to provide an excitation analog signal source, a programmable multi- channel and electrical isolated source system based on DDS technology has been presented in this paper. User can use the interactive interface of the host- computer to set the parameter of the analog excitation signal system, the lower- computer will automatically generates the appropriate waveform according to the set via 485 bus, then independently outputs through 128 electrical isolation channels at most. The result shows that frequency range of the signal source is 0 ~ 8 kHz, the amplitude of the waveform can achieve 70 VP- P, ± 0. 2 % FS accuracy.The whole system has high accuracy and versatility, broad application prospect.

关 键 词：直接数字频率合成 模拟激励信号 电气隔离 485通信总线 

分 类 号：TN741[电子电信—电路与系统]