Reference voltage generating circuit and offset-compensated current-voltage converting circuit using the same

A reference voltage generating circuit generating a reference voltage to be applied to a current-to-voltage converting circuit in order to compensate for an offset voltage of the current-to-voltage converting circuit converting an input current into a voltage and outputting the voltage, the reference voltage generating circuit comprising:

• a sampling conversion circuit having the same circuit characteristics as the current-to-voltage converting circuit and adding a predetermined offset to the reference voltage to generate an output voltage;
• and
• a comparator controlling the reference voltage so that the output voltage of the sampling conversion circuit is equal to a predetermined voltage,
• wherein the reference voltage is applied as an input to the sampling conversion circuit;
• and
• wherein the sampling conversion circuit comprises an operational amplifier having the same offset as the current-to-voltage converting circuit.