Patent ID: 8013772
Filing Date: 2011-09-06
Classification: H03M

Abstract:
1. A digital-to-analog converter (DAC) system comprising: a resistive ladder comprising a plurality of resistors having an approximately equal resistance and being arranged in a respective plurality of resistive rungs between a first end of the resistive ladder and a second end of the resistive ladder, the first end of the resistive ladder being coupled to an output, at least one portion of the plurality of resistors between the first end and the second end of the resistive ladder having a physical size that is descending size-scaled in a direction from the first end of the resistive ladder to the second end of the resistive ladder; and a switching circuit that is configured to connect each of the plurality of resistive rungs to one of a first voltage and a second voltage based on a binary value of a digital input signal to generate a corresponding analog output voltage at the output, wherein the at least one portion of the plurality of resistors are descending size-scaled in the direction from the first end of the resistive ladder to the second end of the resistive ladder by powers of two down to a minimum fabrication process size.