电流负反馈偏置电路图.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: 
"        分压式偏置稳定电路图——电流负反馈偏置电路" 
"        在实际电路中，有两种不同性质的反馈，分别为正反馈和负反馈。" 
"        负反馈：反馈信号Xf为正值，致使误差信号Xi1=Xi-Xf<Xi。（Xi为原输入信号），反馈放大器的增益小于基本放大器的增益。反馈放大器负反馈具有自动调节作用，利用这种作用，可以在很大程度上克服各种外界不稳定因素对增益的影响。它是以牺牲放大器增益为代价的。Rb1为上偏置电阻，Rb2为下偏置电阻，Re为发射极电阻。它们三者组成放大器的偏置电路。" 
"        正反馈：反馈信号Xf为负值，致使误差信号Xi1=Xi-Xf>Xi。（Xi为原输入信号），反馈放大器的增益大于基本放大器的增益。" 
"        在输出端，	电压反馈：凡是反馈信号取自负载Rl上的输出电压的反馈。" 
"		电流反馈：凡是反馈信号取自通过Rl的输出电流的反馈。" 
"        在输入端，        并联反馈：反馈网络与基本放大器相并接。" 
"		串联反馈：反馈网络与基本放大器相串接。" 
"        反馈类型判别方法： 在输出端，将输出负载短接后，如果不存在反馈信号，则为电压反                                                馈；如果仍然存在反馈信号，则为电流反馈。在输入端，将输入端                                               短接后，如果反馈信号加不到基本放大器的输入端，则为并联反馈；" 
"                                            如果反馈信号能够加到基本放大器输入端，则为串联反馈。" 
"       图中，Re为反馈电阻，输出电流Ic*Re的电压反馈回输入端。" 
"	" 

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