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自动增益控制(AGC)放大器利用了控制器件的非线性特征。它们的某些微分参数中的实分量大小会发生变化,这取决于它们的DC工作点的变化。一个典型例子就是硅PN结的VA特征,它导致了与通过的DC电流成正比的微分电导(参考文献1)。在这种控制形式中,主要问题是控制元件的非线性传递特征,一旦被处理的电压振幅超过毫伏级,该特征就会导致较大程度的非线性信号失真(参考文献2)。
Automatic gain control (AGC) amplifiers take advantage of the non-linear nature of the control device. The real component sizes in some of their differential parameters change, depending on how their DC operating points change. A typical example is the VA characteristic of a silicon PN junction, which results in a derivative conductance that is proportional to the DC current passed (Reference 1). In this form of control, the main problem is the non-linear transfer characteristic of the control element, which leads to a greater degree of nonlinear signal distortion once the voltage amplitude being processed exceeds the millivolt range (Reference 2).