Patent ID: 6903610

Claim:
An operational amplifying circuit comprising: an operational amplifier with an output terminal; a first transistor having a control terminal and electrically connected to the operational amplifier, said first transistor being configured to turn on and off according to an output signal outputted from the operational amplifier through the output terminal thereof; a second transistor having a control terminal and electrically connected to the operational amplifier, said second transistor being connected to the first transistor in series, said second transistor being configured to turn off and on reversely with the on and off operation of the first transistor according to the output signal from the operational amplifier; and a current control unit electrically connected to the first and second transistors and configured to detect a current flowing in one of the first and second transistors, said current control circuit being configured to cause a current to flow into the control terminal of the other of the first and second transistors and to make the other of the first and second transistors turn off.