低失真压控放大器及其在超声测距仪中应用

Low Distortion Voltage Control Amplifier and it's Application in Acoustic Range Finder

场效应管具有可变电阻。采用场效应管对构成平衡式压控放大器,其非线性失真小,将其应用于超声测距仪可减轻近旁侧杂物造成的干扰,增加测量距离。

Using FET variable resistance,a complement and symmetrical voltage control amplifier consists of the FET pair and operate amplifier. It presents low nonlinear distortion. It has been applied in ultra-acoustic range finder ,resulting long action range and good anti-disturbance.