Patent ID: 7459977

Claim:
A push-pull circuit comprising: an input terminal receiving an input signal; an output terminal for supplying an output signal; a first circuit that is electrically connected to the input terminal, receives a second current from the input terminal, and supplies current to the output terminal; a second circuit electrically connected to the input terminal, connected between a first node and a second node, for supplying current to the first node; a third circuit electrically connected between the output terminal and the first node, for converting the voltage difference between the output terminal and the first node to a current and providing it as a first current; a first constant current source for supplying a first constant current to the second node; a second constant current source for supplying a second constant current to the first node; a fourth circuit that supplies the sum current of the first current and the second current, which is the difference between the first constant current and the second constant current; and a fifth circuit that supplies a current corresponding to the sum current to the output terminal.