用短路法、开路法分析负反馈电路的组态

根据反馈网络从电路输出回路的不同取样电量和在输入回路的不同连接方式,可把交流负反馈电路的组态分为电压串联、电压并联、电流串联和电流并联4种.通过构建电路存在反馈的必要条件和充要条件,可引出令反馈电路的负载和信号源内阻分别短路或开路的方法,用于分析负反馈电路的组态.实例说明,两者互为对偶,物理意义明确,因果关系等价,逻辑概念清晰,通用性强,适用面广,应用灵活.

The Analysis of the Configuration of the Negative Feedback Circuit by Short Circuit Method and Open Circuit Method

According to the different sample electricity from the output loop of the circuit by the feedback network and the different ways of connection between the input loop of the circuit and the feedback network, can divide the configurations of alternate negative feedback circuit into four kinds: voltage series, voltage parallel, current series and current parallel. By constructing the necessary condition and sufficient condition for feedback to exist in a circuit, can derive the methods of short circuit or open circuit for the load or the signal source resistance respectively of the feedback network, to analyze the configurations of the negative feedback circuits. Instances show that the two methods are in duality, they have definite physical meanings, equivalent cause and effect relation, clear logical conception, versatility, applicability, flexibility.