Patent ID: 8665020

Claim:
A differential amplifier circuit comprising: a differential input stage including a pair of differential MOS transistors whose sources are commonly connected, a pair of load elements that are connected to drain terminals of the differential MOS transistors, respectively, and a first constant-current source that is connected to the common source of the pair of differential MOS transistors; an output stage including an output MOS transistor whose gate terminal receives a potential of an output node of the differential input stage, and a second constant-current source that is connected in series to the output MOS transistor; a constant-current MOS transistor that is provided in parallel to one of the first constant-current source and the second constant-current source; and a boost current controlling MOS transistor in which a potential of a connection node of the output MOS transistor and the second constant-current source is applied to a gate terminal thereof; wherein the boost current controlling MOS transistor is turned on when a voltage inputted to a gate terminal of one of the pair of differential MOS transistors changes, and a current of the constant-current MOS transistor is added to one of the first constant-current source and the second constant-current source and is allowed to flow through one of the differential input stage and the output stage.