并联负反馈放大器下限截止频率f_(Lf)解析式的多样性  

An analytical formula variety of the lower cut-off frequency of amplifier with parallel negative-feedback

作　　者：方天申[1] 

机构地区：[1]信阳师范学院物理电子工程学院,河南信阳464000

出　　处：《信阳师范学院学报（自然科学版）》2004年第3期275-278,共4页Journal of Xinyang Normal University(Natural Science Edition)

摘　　要：根据基尔霍夫定律、交流等效电路,导出了并联负反馈放大器下限截止频率fLf的解析关系式.新关系式能直观、准确描述fLf与电路参数间的函数关系;显示出fLf解析式会因电路级间耦合电容的多少而有不同形式;证明了原关系式给出的实际上是一种模糊关系式.A new formula of the lower cut-off frequency f_(Lf) of amplifier with parallel negative-feedback was given by equivalent circuit and Kirchoff's law.The functional relationship between f_(Lf) and parameters of circuit can been described accurately by the new formula obtained.It has been proved that the method of block diagram doesn't give expression to kirchoff's law of circuit.

关 键 词：并联负反馈 下限截止频率 等效电路 模糊关系式 

分 类 号：TN722[电子电信—电路与系统]