Patent ID: 8004449

Claim:
A digital-to-analog converter comprising: a plus-side input terminal and a minus-side input terminal for inputting differential analog signals; a plus-side reference voltage terminal and a minus-side reference voltage terminal; a plus-side digital-to-analog converter including a plurality of plus-side capacitors having capacitance values weighted by the powers of two, a plus-side output terminal connected to first electrodes of the plurality of plus-side capacitors, and a plurality of plus-side switches for connecting each second electrode of the plurality of plus-side capacitors to either the plus-side input terminal, the plus-side reference voltage terminal or the minus-side reference voltage terminal according to plus-side control digital signals; a minus-side digital-to-analog converter including a plurality of minus-side capacitors having capacitance values weighted by the powers of two, a minus-side output terminal connected to first electrodes of the plurality of minus-side capacitors, and a plurality of minus-side switches for connecting each second electrode of the plurality of minus-side capacitors to either the minus-side input terminal, the plus-side reference voltage terminal or the minus-side reference voltage terminal according to minus-side control digital signals; and a plurality of short-circuit switches provided between identically weighted plus-side capacitors and minus-side capacitors respectively, wherein, at the time of sampling, the plus-side and minus-side switches connect the second electrodes of the plus-side and minus-side capacitors to the plus-side and minus-side input terminals, respectively, and wherein, after the sampling, the plurality of short-circuit switches short-circuit between the second electrodes of the plus-side and minus-side capacitors.