Patent ID: 7940036

Claim:
A voltage comparison circuit for detecting a voltage difference of two input signals, the voltage comparison circuit comprising: one or more differential amplifier circuit units, each of which includes a differential pair of a first input transistor and a second input transistor each input transistor having a control electrode to which a corresponding one of the input signals is input, a constant current circuit unit configured to generate a first constant current in accordance with an input control signal and supply the first constant current to the first input transistor and the second input transistor, and a first resistor connected between the constant current circuit unit and the first input transistor; and a current control circuit unit configured to perform operational control on the constant current circuit unit to control a current value of the first constant current; wherein the current control circuit unit controls the current value of the first constant current so that a voltage difference between both ends of the first resistor becomes equal to a predetermined value.