Patent ID: 8068044

Claim:
A correction circuit for an addition-type D/A converter which includes an addition unit for generating a voltage or a current in correspondence with each of bit values of an input digital signal and adding to one another, the correction circuit comprising: a constant current source connected in parallel to the D/A converter between high- and low-potential power source lines for supplying a power source voltage to the D/A converter; and a current controller which is adapted to receive the input digital signal and control a current flowing from the constant current source in accordance with the bit values of the input digital signal to the D/A converter, so as to reduce a variation of a sum of currents which, even when the input digital signal to the D/A converter is varied, flows to the low-potential power source line from the high-potential power source line through the addition unit of the D/A converter and through the constant current source, respectively.