【摘要】 介绍四种组态负反馈放大电路动态电阻（输入电阻和输出电阻）采用方框图的分析方法．对比具有负反馈和没有负反馈时其阻值的变化．无论是分立元件电路或者是由集成运放组成的负反馈放大电路，这种分析方法都适用，既简便又有规律．更多还原

【Abstract】 This papear introduces dynarnic resistance (input and output resistance) of four configuration negative feedback amplifying circuit.It uses analytic method of sguare frame picture.It contrasts resistance value change in negadtive feedback with no negative feedback.The analytic method all is suitable,simple,convenient and regular on boch separate element and integrated negative feedback amplifying ciruit.更多还原