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交变电流源需要将电感器型传感器的激励以及参考信号作为应用基础,同时,交变电流源所发出的频度精度、稳定度等对传感器测量的精度会起到关键决定作用。基于直接数字合成技术的交变电流源系统在一定程度上具有较高的性能,交变电流源能够通过单片机对直接数字合成技术的芯片进行控制,从而将两路信号进行差分放大,并且能够对电压变电流进行处理。本文在了解基于直接数字合成技术的交变电流源系统原理的基础上,重点对该系统设计做出了研究。
The alternating current source needs the excitation of the inductor type sensor as well as the reference signal as the application basis. Meanwhile, the frequency accuracy and stability of the alternating current source play a decisive role in the accuracy of the sensor measurement. The alternating current source system based on direct digital synthesis technology has high performance to a certain extent. The alternating current source can control the chip of the direct digital synthesis technology through a single chip microcomputer, so that the two signals can be differentially amplified, Voltage variable current processing. Based on the principle of AC current source system based on direct digital synthesis technology, this dissertation focuses on the design of this system.