| 摘要 |
Disclosed is a differential operational amplifier that outputs first and second output voltages corresponding to first and second input voltages, the amplifier comprising a differential circuit that operates depending on the first and second input voltages; a control voltage generation circuit that generates a control voltage for making an intermediate voltage of the first and second output voltages become a predetermined reference voltage; a variable current generation circuit that is connected serially to the differential circuit to generate a variable current corresponding to the control voltage; and a constant current generation circuit that is connected in parallel with the variable current generation circuit to generate a constant current, control being performed with the variable current and the constant current such that the intermediate voltage turns to the reference voltage.
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