Patent ID: 7737733

Claim:
A current-voltage conversion circuit which converts a current to be detected into a voltage, comprising: a detection resistor provided on a path through which the current to be detected flows; a first resistor, a first transistor and a second resistor connected in series between a high-potential first terminal of the detection resistor and a first fixed voltage terminal; a first operational amplifier which has its output terminal connected to the control terminal of the first transistor, and has its inverting input terminal connected to a node between the first resistor and the first transistor; an offset resistor which is provided between a low-potential second terminal of the detection resistor and the non-inverting input terminal of the first operational amplifier; an offset adjusting current source which includes a trimmable resistor and causes an offset adjustment current to flow in the offset resistor, the current value of the offset adjustment current being controlled by adjusting the resistance of the resistors, wherein a voltage at a node between the first transistor and the second resistor is output.