Patent ID: 7183852

Claim:
A differential amplifying apparatus comprising: a first differential transistor pair including two transistors of a first polarity configured to be operated by a first predetermined constant current; a second differential transistor pair including two transistors of a second polarity configured to be operated by a second predetermined constant current; a first current mirror circuit configured to receive a first power supply voltage and output a current approximately equal or proportional in amount to a current flowing through one transistor of the first differential transistor pair; a second current mirror circuit configured to be connected to an output terminal, receive the first power supply voltage, and output a current approximately equal or proportional in amount to a current flowing through the other transistor of the first differential transistor pair; a third current mirror circuit configured to be connected to the output terminal, receive a second power supply voltage, and output a current input from the first current mirror circuit; a fourth current mirror circuit configured to receive the second power supply voltage and output a current approximately equal or proportional in amount to a current flowing through one transistor of the second differential transistor pair; a fifth current mirror circuit configured to be connected to the output terminal, receive the second power supply voltage, and output a current approximately equal or proportional in amount to a current flowing through the other transistor of the second differential transistor pair; and a sixth current mirror circuit configured to be connected to the output terminal, receive the first power supply voltage, and output a current input from the fourth current mirror circuit.