互补推挽输出级电路图.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: 
"互补推挽输出级电路图" 
"	这种电路广泛应用于功率输出级和集成运算放大器的输出电路中。" 
"	图中VT1和VT2组成推挽输出级，VT3是推动级。推动级以电流源作为有源负载。二极管D1和D2用来使输出级两管取得合适的偏置。这里用二极管而不用电阻，是因为二极管的微变电阻比直流电阻小，可以使VT1和VT2的基极间保持必需的直流电位差，而交流电压降很小，这样VT1和VT2得到非常接近的交流电压，从而能在负载RL上得到正负两半周对称的波形。" 
"	由于VT1和VT2具有相反的导电型，在相同输入信号作用下，其电流的大小变化方向相反，一个管的电流增大时，另一个管的电流减小。流过负载的电流是两管电流之和，其总效果可形象地喻为一推一挽，互为补充，这就是此一电流被称为互补推挽电流的由来。" 

EncryptionType: 2
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