Patent ID: 7167050

Claim:
A differential input section comprising: a differential circuit having a first transistor and a second transistor, wherein source electrodes of the first and second transistors are connected to each other; a first current mirror circuit connected to the first transistor; a second current mirror circuit connected to the second transistor; and a circuit that is connected to the first and second current mirror circuits and that is responsive to a voltage level of a signal output by the second current mirror circuit, so that a voltage level of a signal output by the first current mirror circuit becomes equal to the voltage level of the signal output by the second current mirror circuit, wherein said circuit comprises a third transistor having a gate electrode connected to the second current mirror circuit, a source electrode connected to a constant current source and a drain electrode coupled to a first voltage line, and a fourth transistor having a gate electrode connected to the source electrode of the third transistor, a source electrode connected to the first current mirror circuit and a drain electrode coupled to a second voltage line.