Patent ID: 7501970

Claim:
An n-bit digital to analog converter (DAC) for converting a digital input signal to an analog output signal, the DAC comprising: a first voltage divider coupled between a first input voltage and an intermediate voltage having a plurality of first nodes, wherein the first voltage divider includes a plurality of R-2R sections coupled to one another; a first switching circuit coupled to each first node and coupled to a first output node, wherein the first switching circuit includes a plurality of first selection lines; first decoder for decoding at least a first portion of the digital input signal, wherein the first decoder applies selection signals to the first selection lines of the first switching circuit; a second voltage divider coupled between the intermediate voltage and a second input voltage having a plurality of second nodes, wherein the second voltage divider includes a plurality of R-2R sections coupled to one another; a second switching circuit coupled to each second node and coupled to a second output node, wherein the second switching circuit includes a plurality of first selection lines; and a second decoder for decoding at least a portion of the digital input signal, wherein the second decoder applies selection signals to the second selection lines of the second switching circuit to produce the analog output signal between the second and first output nodes.