voltage controlled amplifier

例句：

1. 1.The voltage controlled amplifier is used to amplify signals at different voltage levels.
   电压控制放大器用于在不同电压水平下放大信号。
2. 2.The voltage controlled amplifier was designed to improve the signal-to-noise ratio of the system.
   电压控制放大器被设计用来提高系统的信号与噪声比。
3. 3.The voltage controlled amplifier is an essential component in many electronic circuits.
   电压控制放大器是许多电子电路中必不可少的组件。