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在当今时代,信号发生系统的作用越来越突出,它涉及到许多方面,如工业控制、生物医学、航空航天等方面。而设计出一种性能好、稳定性高、功能全等特点的信号发生系统也是目前最热门的研究。本系统以AT89C51单片机为核心主体。采用数模转换的方法产生一些所需要的常用的信号。系统的部件除了AT89C51单片机外,还有DAC0382数模转换器、一般的矩阵键盘电路、74LS138译码器、74HC573锁存器和8位的数码管显示器等部件构成的外围电路。本系统的硬件电路结构简单、易于实现,采用数模转换的方法产生一些所需要的常用的信号。通过对系统进行软件仿真检验,其输出的波形具有失真度小、频率稳定性高、可调频率范围大、可调的幅值范围等特点。
In today’s era, signal generation systems are becoming more and more prominent and involve many aspects such as industrial control, biomedicine, aerospace and other aspects. The design of a good performance, high stability, full-featured signal generator system is currently the most popular research. The system to AT89C51 microcontroller as the core. Using digital to analog conversion method to generate some of the commonly used signals. System components in addition to AT89C51 microcontroller, there DAC0382 digital-analog converter, the general matrix keyboard circuit, 74LS138 decoder, 74HC573 latch and 8-bit digital tube display and other components of the peripheral circuit. The system hardware circuit structure is simple, easy to implement, using digital-analog conversion method to generate some of the commonly used signals. Through the software simulation test of the system, the output waveform has the characteristics of small distortion, high frequency stability, adjustable frequency range, adjustable amplitude range and so on.