Patent ID: 7336211

Claim:
An integrated circuit of an R-2R ladder digital to analog converter, comprising: a plurality of bit-groups, each comprising: a rung circuit comprising: a switching device that receives binary input and has a resistance; and a first resistance having a first terminal connected to the switching device; a second resistance having a first terminal connected to a second terminal of the first resistance, wherein the first resistance has a first nominal value of 2R and the second resistance has a second nominal value of R; wherein the second terminal of the first resistance of each rung circuit is connected to a second terminal of the second resistance of a different bit-group; and wherein, for at least one bit-group of the plurality of bit-groups, at least one of the first resistance significantly differs from the first nominal value and the second resistance significantly differs from the second nominal value such that the resistance of the switching device of the at least one bit-group is compensated.