基于MCS-51的高精度信号发生器设计与仿真验证

Design and Simulation Verification of High Precision Signal Generator Based on MCS-51

本文设计的信号发生器以MCS-51单片机为核心,辅助以按键电路、显示电路、数模转换电路,能够发出三角波、正弦波、方波、锯齿波四种波形。通过引入DAC0823芯片,将数字量和模拟量进行转换,使得信号发生器发出的波形的误差和噪声干扰更小,并简化了滤波过程。仿真过程中通过软件程序控制硬件电路,利用Keil仿真平台的元器件仿真功能和程序编辑功能将程序搭建好,然后一同放入Proteus仿真平台中,通过后者的元器件选择和参数调节功能将信号发生器的主控电路搭建完成。最后,利用模拟示波器得到了满足设计要求的波形,验证了信号发生器的性能。

The signal generator designed in the paper takes MCS-51 microcontroller as the core,assisted by key circuit,display circuit,digital-to-analog conversion circuit,can send out four kinds of waveform of triangle wave,sine wave,square wave,sawtooth wave.By introducing DAC0823 chip to convert digital and analog,the waveform error and noise interference of signal generator are reduced,and thefiltering process is simplified.In the simulation process,the hardware circuit is controlled by software program,and the program is built by using the component simulation function and program editing function of Keil simulation platform.Then the program is put into Proteus simulation platform together,and the main control circuit of the signal generator is built through the component selection and parameter adjustment function of the latter.Finally,the waveform satisfying the design requirements is obtained by using the analog oscilloscope,and the performance of the signal generator is verified.