Patent ID: 7471112

Claim:
A differential amplifier circuit comprising: a current source circuit disposed between a differential common node and a ground potential; a first differential input circuit disposed between the differential common node and a first load circuit; and a second differential input circuit disposed between the differential common node and the second load circuit for producing a judgment output at a judgment output node between the second differential input circuit and the second load circuit; the first and the second differential input circuits being provided with input interruption switches disposed on input lines thereof for interrupting input signals; the current source circuit being activated and the differential amplifier circuit being started at a first timing; the input interruption switches being controlled to supply the input signals to the differential input circuits at a second timing following the first timing, wherein, after and while the current source circuit is activated and the differential amplifier circuit is started, the input interruption switches are turned conductive and the input signals are supplied to the first and the second differential input circuits.