An amplifier or attenuator may be needed to ensure that the required level of power is transmitted through the switch.
可能就需要一个放大器或衰减器，以确保通过开关传输所需的功率。
An active semiconductor device with three electrodes that may be either an amplifier or a switch.
一种有源半导体器件，有三个电极，可以是放大器。
Operational amplifier is the most versatile signal conditioning block in any portable system. It can be a filter, an amplifier, an voltage detector, a level shifter, a buffer or even a switch.
对于便携式电子产品来说，运算放大器可算是万能的信号调节电路，因为它可以执行滤波器、放大器、电压感测器、电平移位器、缓冲器、甚至开关等多种不同功能。
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