频率通过用可编程器件EPLD控制，而脉冲信号的宽度和幅度通过多路模拟开关和数字电位器调节。
The pulse frequency can be selected by EPLD. The voltage amplitude and pulse width of analog pulse can be adjusted by analog switches and digitally controlled potentiometers.
本文介绍了MAX4624模拟开关的基本特性，给出了利用模拟开关降低继电器功耗的设计电路，并说明了其工作原理及元器件的选择方法。
This paper introduces the characteristic of analogue switch MAX4624. gives the designing circuit of cutting down relay's power loss, it 's work principle and the methods of selecting components.
介绍了一种利用模拟可编程器件和数字可编程器件设计三工位开关控制器的方案，并给出了具体的电路图和程序代码。
A scheme for designing the three-position switch with both analog and digital devices is presented with specific diagram and program code.
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