现场可编程门阵列芯片通常支持两个或更多个电源电压，以允许用户在所支持的电源电压之间切换。
Field programmable gate array chips typically support two or more power supply voltages, allowing the user to switch between the supported power supply voltages.
送丝脉冲到来的瞬间，电源输出电压切换为基值。
When the pulse of wire feed occurs, the output is switched to the base value.
这种输出特性还便于AD590实现多路复用：输出电流可以通过一个CMOS多路复用器切换，或者电源电压可以通过一个逻辑门输出切换。
The output characteristics also make the AD590 easy to multiplex: the current can be switched by a CMOS multiplexer or the supply voltage can be switched by a logic gate output.
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