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Output power amplifier circuit of operational amplifier

2015-01-04 15:09  
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Output power amplifier circuit of operational amplifier
The circuit shown in Fig uses two transistors as an emitter follower, and diode for reducing the control dead zone (transistor base - emitter voltage UBEs = 0.7V ), and about 1mA current on the base resistor to form a bias and decide electrode quiescent current. The circuit shown in Figure b is connected to two resistors in the op-amp power connection. The quiescent current from two resistors flowing through the operational amplifier to produce about 0.7V voltage drop.