电压并联反馈电路模型的建立及计算公式的推导

Building of feedback Circuit model with parallel Voltage and Derivation of the calcalating Formula

在建立电压并联反馈电路模型基础上,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。给设计出高性能放大电路及电子仪器指明了方向,同时使电压并联反馈电路的计算更方便。

This paper presents the way to derivate precise calculating formulae 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 put forward, it is possible to solve the problems in terms of calculation in amplifying circuits, the key problem being low level of exactness. The research shows the influence of components＇ parameters of basic amplifying circuits and 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 voltage.