Patent ID: 6037889
Filing Date: 2000-03-14
Classification: H03M

Abstract:
An apparatus for improving the integral non-linearity matching of multiple resistor-string based digital-to-analog converters (DACs) connected in parallel between a first reference voltage and a second reference voltage, each DAC comprising a plurality of resistors coupled in series between said first reference voltage and said second reference voltage, comprising:a first resistor coupled in parallel across said first reference voltage and a first subset of said plurality of resistors of each of said DACs, said first resistor having a lower resistance than the combined resistance of said first subset of said plurality of resistors of each of said DACs; anda second resistor coupled in series with said first resistor between said first reference voltage and said second reference voltage, and in parallel across said second reference voltage and a second subset of said plurality of resistors of each of said DACs, said second resistor having a lower resistance than the combined resistance of said second subset of said plurality of resistors of each of said DACs.