基于电流并联反馈电路模型的计算公式推导

Derivation of the Calculating Formula on the Feedback Circuit Model with Parallel Current

在建立电流并联反馈电路模型的基础上,推导出放大电路中的电压放大倍数、输入电阻、输出电阻的精确计算公式。提出了新的计算方法,从而解决了放大电路计算不方便,精确度不高、准确性不够的问题。进一步揭示了基本放大电路、反馈电路元件参数对反馈放大电路的影响关系。为设计出高性能放大电路及电子仪器指明了方向,同时使电流并联反馈电路的计算更方便。

This paper puts forward the derivation of precise calculating formula used to determine the magnification ratio of voltage, input resistance and output resistance in amplifying circuits based on the feedback circuit model with parallel voltage. With the new calculating methods, it is possible to solve the problems in terms of calculation in amplifying circuits, the problem of low level in exactness. The research also reveals the influence of basic amplifying circuits and components parameters of feedback circuits on feedback amplifying circuits. The results of the research may contribute to designing amplifying circuits and electronic instrument with higher performance, due to the simpler calculation in the design of feedback circuit with parallel current.