Patent ID: 7129877

Claim:
A digital-to-analog (D/A) converter comprising: a voltage generator generating a plurality of reference voltages forming a monotonic sequence of voltage levels; a first control circuit for selecting an arbitrary one of the plurality of reference voltages as a first output; a second control circuit for selecting another one of the plurality of reference voltages, adjacent in the monotonic sequence to the one of the plurality of reference voltages selected by the first control circuit, as a second output; and a third control circuit for generating a third output from the first output and the second output, the third control circuit having a plurality of capacitors and a switching network for charging at least one of the capacitors to a voltage difference between the first output and the second output, then redistributing charge among the capacitors to generate an intermediate voltage intermediate between the first output and the second output, and selectively supplying one of the first output, the second output, and the intermediate voltage as the third output.