基于PIC单片机的正交正弦信号发生器的设计

Design of Orthogonal Sine Signal Generator Based on PIC Microcontroller Unit

设计了一个基于PIC16F877A单片机和DDS芯片AD9854的数字信号发生器,该信号发生器可以根据输入方波信号自动输出两路同频率的正交正弦信号;对PIC16F877A和AD9854的硬件实现方案及单片机的控制软件进行了详细的介绍。所设计的数字信号发生器具有输出信号正交性好、频率稳定度高、可以自动跟踪输入方波信号的频率等特点。

A signal generator based on PIC16F877A microcontroller unit and DDS chip AD9854 is designed in this paper,the signal generator can provide two orthogonal sine waves of equal frequency according to the input square-wave, the hardware implementation strategy and the control software of PIC16F877A microcontroller unit and AD9854 are introduced in detail. The signal generator can output better orthogonal signal,which not only has high frequency stability,but also can trace the frequency of input-square-signal automatically.