Patent ID: 7532068

Claim:
A differential amplifier circuit, comprising: first to third constant current sources; a first transistor in which an electrode on one side configured to generate a threshold voltage in conjunction with a control electrode is connected to the first constant current source, an electrode on the other side is connected to the second constant current source, and the control electrode is configured to be applied with a first input voltage; a second transistor in which an electrode on one side configured to generate a threshold voltage in conjunction with a control electrode is connected to the first constant current source, an electrode on the other side is connected to the third constant current source, and the control electrode is configured to be applied with a second input voltage; and a third transistor in which an electrode on one side configured to generate a threshold voltage in conjunction with a control electrode is connected to the electrode on the other side of the first or second transistor, the third transistor being configured to output to an electrode on the other side thereof a current corresponding to a difference between the first and second input voltages, the control electrode of the third transistor being configured to be applied with a voltage corresponding to that of the electrodes on the one side of the first and second transistors.