Improving load capacity circuit diagram

Published:2011/7/15 10:01:00 Author:Nancy | Keyword: load capacity | From:SeekIC

The load capacity of the general integrated operational amplifier load ability is weak, it only allows for dozens of mV power consumption, the maximum output current is also only 10 mA. So, when need large load voltage or current, you need add circuit with extended function at its output pin. The circuit shown as figure a is a circuit using complementary push-pull output to expand current. When Ui = 0, Uo = 0, the current flows through the base loop of Rb, VD1, VD2 and VT1,VT2 and it provides bias current to VT1 and VT2, which makes it work in A B amplification state and reduce crossover distortion. The weakness of the circuit is that it can't raise voltage range. The circuit shown as figure b is a circuit which can expand current and voltage range.



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