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本文介绍的低噪声多功能前置放大器具有低噪声放大、窄带滤波、对称限幅、阻抗变换以及强电平输入时的自动保护等多种功能.该放大器可广泛用于需要放大弱信号,而信号源内阻较高,信号动态范围很大,电源功耗又受到一定限制的场合,如水声接收机,鱼探机以及探测海洋资源、地质地貌的仪器设备中. 放大器电原理图如下图所示.该电路有如下优点:
The low-noise multi-function preamplifier described in this article has many features, such as low noise amplification, narrowband filtering, symmetrical clipping, impedance transformation, and automatic protection at high level inputs, etc. The amplifier can be used in a wide range of applications requiring amplification of weak signals, Signal source resistance is high, the signal dynamic range is large, the power consumption is subject to certain restrictions occasions, such as underwater acoustic receivers, fish exploration and detection of marine resources, geology and geomorphology instruments and equipment. Amplifier circuit diagram as shown below The circuit has the following advantages: