Patent ID: 7675363

Claim:
A differential amplifier circuit comprising at least one differential amplifier, said at least one differential amplifier including: first and second power supplies; one and other differential transistors receiving one input signal and other input signal at a control electrode, respectively, and having respective one electrodes commonly connected; a differential operation constant current source interposed between the one electrodes of said one and other differential transistors and said second power supply; first and second loads having respective one ends commonly connected to said first power supply and other ends connected to first and second output parts, which are other electrodes of said one and other differential transistors, respectively, and contributing to an amplification degree of an input/output signal; and amplification degree adjustment units, arranged in correspondence to said first and second loads, which becomes a non-operation state when an input potential difference, which is a difference between said one input signal and said other input signal, is below a predetermined threshold value and does not influence said amplification degree, and which becomes an operation state when said input potential difference exceeds said predetermined threshold value and lowers said amplification degree.