基于DDS技术的正弦交流信号源的设计

摘要

For designing and realizing a kind of sine-signal source which can output power, a design of AC sine-signal source based on DDS which used MCU as cybernetics core and AD9850 as frequency synthesizer is introduced. This AC sine-signal source can produce sine signal, which has stable frequency, the frequency range is l~100 Hz, the magnitude of current is adjustable, has certain drive capability and output power. This product used MCU to write Voltage Control Words (VCW) into the AD603 in order to indirectly control and change the gain of the magnitude of voltage, so as to make the RMS current of AC of the same load adjustable. This method has hewn out a new thought for the improvement of function of the congeneric signal-source products.%以设计和实现可以进行功率输出的正弦波信号源为目的,提出了一种基于DDS技术,以单片机为控制核心、AD9850芯片为频率合成器的正弦交流电流信号源的设计方法.该正弦交流电流信号源可以产生频率稳定且频率范围为1～100 Hz,电流幅值可调的正弦电流信号,具有一定的带负载和功率输出能力.该产品创造性地运用单片机向D/A写入电压控制字的方式间接控制和改变AD公司生产的AD603芯片对正弦波信号电压幅值的增益,实现对于同一负载输出交变电流的有效值可调节的功能,为同类信号源产品的功能改进开辟了新的思路.