Patent ID: 7532140

Claim:
A digital to analog converter that produces an analog output voltage indicative of a digital input signal, the converter comprising: a split-core resistive element comprising at least first and second resistive strings configured in such a pattern as to provide said analog output voltage with at least partial insensitivity to error gradients that affect said split-core resistive element; said split-core resistive element being coupled to a first reference voltage and a second reference voltage; said first and second resistive strings each having a plurality of sequential voltage taps for supplying voltages based on said digital input signal to an interpolation circuit; said interpolation circuit being configured for producing at least one interpolated voltage based on at least two voltages selected from the voltage taps of the first resistive string and at least two voltages selected from the voltage taps of the second resistive string to provide said analog output voltage, said interpolated voltage having at least two distinct values indicative of the digital input signal, and said interpolation circuit drawing substantially zero current from said resistive strings.