本作品以STC89C51单片机为核心设计了一个函数信号发生器。信号发生器采用数字波形合成技术,通过硬件电路和软件程序相结合,定义波形,如正弦波、方波、三角波、锯齿波，波形的频率100HZ到10KHZ和幅度0V到5v范围内可任意改变。波形和频率的改变通过软件控制，幅度的改变通过硬件实现。输出频率及幅度可以通过LCD1602进行显示；可以1Hz、10 Hz、100 Hz、1000 Hz 步进该信号发生器具有体积小、价格低、性能稳定、功能齐全的优点。-This work with STC89C51 microcontroller as the core a function signal generator is designed. Signal generator with digital waveform synthesis technology, through the combination of hardware circuit and software program, define the waveform, such as sine wave, square wave, triangle wave, sawtooth wave, wave frequency of 100 hz to 10 KHZ to 0 v to 5 v and amplitude can be arbitrary change. Waveform and frequency of change through software control, the amplitude of change through hardware implementation. The output frequency and amplitude can be through the LCD1602 display　Can 1 Hz, 10 Hz and 100 Hz and 1000 Hz steps into the signal generator has small volume, low price, the advantages of stable performance,