16kHz高精度交流信号源的设计与实现

The Design and Implementation of 16 kHz High-precision AC Signal Source

本文介绍了一种高精度模拟正弦信号源的设计与实现，采用NiosⅡ嵌入式处理器控制来产生高精度的交流信号，它被用作模拟飞行校准装置的信号源。该信号源由FPGA、DA数模转换器、差分运放、低通滤波等模块组成。主要采用NiosⅡ嵌入武处理器和直接数字频率合成（DDS）、PLL、D／A及差分放大等技术，设计出频率分辨率小于5Hz，频率为16kHz，幅度为3V±0．5V的模拟正弦波。

This paper introduces the design and implementation of a high-precision simulated Sine signal source, the Nios Ⅱ embedded processors control is adopted to generate the high-precision AC signal, it is used for the signal source of simulated flight calibrating device. The signal source is composed of the modules of FPGA, D/A converter, differential amplifier and LPF （Lowpass filtering）, etc. The simulated sine wave with its frequency resolution is tess than 5Hz, the frequency is 16 kHz and the amplitude is 3V±0.5V has been designed by mainly using the technologies of Nios Ⅱ embedded processor, Direct Digital Synthesis （DDS）, PLL, D/A and differential amplifying, and so on.