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文章根据晶体管的电流方程,导出了三级管输出特性线性化处理的基本原理,并根据该原理建立了理想的电路模型。文中在基本放大器的基础上引入了对数反馈网络,利用电压负反馈,消除了三级管两端电压和其集电极电流的非线性,使其伏安特性曲线变为直线、线性,且斜率可变。由此构成的电子电位器的分压比可以连续可调,达到了精细可调的目的。文中还简述了电子电位器在直流电路和交流电路中的简单应用。
According to the current equation of the transistor, the article deduces the basic principle of the linearization of the output characteristic of the three-level transistor and establishes the ideal circuit model according to the principle. In this paper, a logarithmic feedback network is introduced based on the basic amplifier. By using the voltage negative feedback, the nonlinearity of the voltage across the transistor and its collector current is eliminated, and the volt-ampere characteristic curve becomes linear, linear and slope variable. The resulting electronic potentiometer partial pressure ratio can be continuously adjustable to achieve the purpose of fine tuning. The article also briefly describes the electronic potentiometer in the DC circuit and AC circuit simple application.