反相输入式放大电路图.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: 
"反相输入式放大电路图" 
"        Rf1和Rf2构成反馈电路，Rr为温度补偿电阻。" 
"        Rr的温度补偿原理如下：运算放大器的输入级为一差动放大，同相输入端晶体管的基极电流流经电阻Rr，反相输入端晶体管的基极电流流经电阻Rf1与Rf2并联之值。如果选择Rr等于Rf1与Rf2并联之值，当温度变化造成偏流变化，则偏流分别在两个输入端外接偏流电阻上产生的电压降保持相等，无差模输入电压，则输出电压保持不变。" 
"        这是一个具有电压并联负反馈的放大器。反馈很深，在深负反馈条件下，放大器的输入端可看作虚短路和虚开路。" 
"        放大倍数：Af=Uo/Ui=—Rf2/Rf1。" 
"        可知，Rf1减少，可以提高放大倍数，而减少Rf2，放大倍数会减小。" 
"        为提高输入电阻，避免使用高欧姆电阻，可用一个T型网络来代替Rf2，只要放大器输出电阻通过T型网络在反相输入器产生的短路反馈电流，和通过一个大电阻Rf2在反相输入端所产生的短路反馈电流相等，即传输电导相等，则两个电路在计算放大倍数是等效的。" 

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