Patent ID: 7259706

Claim:
A digital to analog converter system for receiving an input signal and a sign bit signal that is indicative of the sign of the input signal, said digital to analog converter system comprising: a first pair of resistor strings, a first one of the first pair of resistor strings being adapted for coupling between a first voltage potential and an intermediate node; a first switching network adapted to couple a voltage produced across a selected one of resistors in the first string across the second one of the resistor strings, the resistors in the second resistor string producing voltages in response to current passing from the first resistor string to the second resistor string through the first switching network; a second pair of resistor strings, a third one of the second pair of resistor strings being adapted for coupling between a second voltage potential and the intermediate node; and a second switching network adapted to couple a voltage produced across a selected one of resistors in the third string across the fourth one of the resistor strings, the resistors in the fourth resistor string producing voltages in response to current passing from the third resistor string to the fourth resistor string through the second switching network.