二级电压串联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: 
"多路放大电路图" 
"	该电路图是两级放大电路，电路为CE-CC型，由于前级CE的输出幅度小于后级CC的输出幅度，因而在 输入信号增大过程中，CE级输出首先出现失真，根据CE级电路ACLL上U（CEQ）处右侧线段较短可知，CE级输出U01端首先出现截止失真，亦称顶部失真。经CC电路射极跟随输出，Uo端同样出现顶部被削的波形。" 
"	由于失真出现在第一级，且为截止失真，故采用静态工作点Q上移的办法可消除之，可以考虑减小电阻Rb1以提高Ub1的电位，进而使ICQ1增加达到工作点上移的目的。" 
"	示波器接于输入端和第一级输出端，明显看到当信号增长至400V以上时，第一级输出端的波形出现截止失真。" 

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