用数字方式产生模拟波形之所以可能,那是因为:1)CMOS电路输出满幅度的特性使我们可以直接用电源较精确地控制波形的幅度。2)数字电路,尤其是它的计数器和移位寄存器配上电阻D/A网络能方便地产生各种波形。调试方便,波形可任意变化。3)这种方式产生的模拟波形较容易用微机进行控制。 Digitally generated analog waveforms are possible because: 1) The full amplitude of the CMOS output allows us to control the amplitude of the waveform directly with the power supply. 2) Digital circuit, especially its counter and shift register coupled with resistor D / A network can easily generate a variety of waveforms. Easy debugging, the waveform can be any change. 3) The analog waveform generated in this way is easier to control with a microcomputer.