Patent ID: 6914547

Claim:
A digital-to-analog converter, comprising: a triple switching tree switchably coupled to a triple resistor string and to an analog output, wherein the triple resistor string includes a first resistor string having a first plurality of resistors for coupling across the voltage supply, a second resistor string having a second plurality of resistors, and a third resistor string having a third plurality of resistors, and wherein the triple switching tree comprises a first switching network comprising a first mirror-imaged plurality of switches, wherein each of the first mirror-imaged plurality of switches having an input connected to one of the first plurality of resistors and an output to couple across the second resistor string; a second switching network comprising a second mirror-imaged plurality of switches, wherein each of the second mirror-imaged plurality of switches having an input connected to one of the second plurality of resistors and an output to couple across the third resistor string; and a third switching network comprising a third mirror-imaged plurality of switches, wherein each of the mirror-imaged plurality of switches having an input connect to one of the third plurality of resistors and an output to connect to the analog output, wherein the plurality of switches in each branch is substantially simultaneously controlled by an N-bit digital word to output a range of corresponding analog voltage signals, and wherein the triple switching tree is operable when the triple resistor string is coupled across a voltage supply.