Patent ID: 9236875
Filing Date: 2016-01-12
CPC Classification: H03M

Claim Text:
1. A D/A converter comprising: a first capacitative element unit including a plurality of capacitative elements configured to store a first charge depending on a reference voltage corresponding to a first digital code; a first switching element unit including a plurality of switching elements configured to store the first charge in the plurality of capacitative elements of the first capacitative element unit, respectively, and to transfer the first charge; a second capacitative element unit including a plurality of capacitative elements configured to store a second charge depending on a reference voltage corresponding to a second digital code; a second switching element unit including a plurality of switching elements configured to store the second charge in the plurality of capacitative elements of the second capacitative element unit, respectively, and to transfer the second charge; an integral capacity element to which the first and the second charges stored in the first capacitative element unit and the second capacitative element unit are transferred; and an operational amplifier connected to the first switching element unit and the second switching element unit, wherein the first switching element unit is configured to store the first charge in the plurality of capacitative elements of the first capacitative element unit at different sampling timings for the plurality of capacitative elements of the first capacitative element unit, the different sampling timings being within a time interval after a previous transferring of the first charge stored in the first capacitative element unit to the integral capacity element and before a subsequent transferring of the first charge stored in the first capacitative element unit to the integral capacity element, and the second switching element unit is configured to store the second charge in the plurality of capacitative elements of the second capacitative element unit at different sampling timings for the plurality of capacitative elements of the second capacitative element unit, the different sampling timings being within a time interval after a previous transferring of the second charge stored in the second capacitative element unit to the integral capacity element and before a subsequent transferring of the second charge stored in the second capacitative element unit to the integral capacity element.