电流串联复合负反馈放大器电路图.ewb

通信原理-高频电子电路CAI-340页-22.2M-ppt版.zip

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"电流串联复合负反馈放大器电路图（电容补偿电路）" 
"	是实际工作中用负反馈扩展频带的电路形式之一。Ce的容量比一般旁路电容要小得多。只有几个皮法到几百皮法。这时，电阻Re和电容Ce的并联阻抗不可忽略，因而在电路中引入了电流复合负反馈。反馈电路是由Re和Ce并联组成的负阻抗。并且反馈的强弱随信号频率不同而改变。这个电路具有扩展频带的作用。" 
"	扩展频带的原理：从频率响应来看，由于Ce容量很小，因此，在放大电路的低频段和中频段所呈现的容抗很大，对Re没有什么旁路作用。该电路与断开Ce时的电流串联负反馈放大器一样，或者说，在低频段和中频段范围内，反馈阻抗与频率无关，负反馈放大器的中频增益仍由电阻Re的负反馈作用来决定。但在放大电路的高频段，Ce的容抗随频率的增高而减小，从而使Re的并联阻抗减小。与中频段相比，高频段的反馈电压也随之下降，结果补偿了放大器在高频段由晶体管极间电容和分布电容Co等因素造成的高频增益的下降，扩展了通频带。加入Ce后，放大器的带宽可比采用纯电阻Re负反馈时适当加宽，而中频增益不变，结果使整个电路的增益带宽积比一般用纯电阻Re产生的电流串联负反馈电路的大。" 
"	该电路的优点：在一般电流串联负反馈电路中，加入一个简单的元件Ce就能改善增益带宽积。因此，这种电路又称为电容补偿电路，Ce称为补偿电容。" 
"" 

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