Abstract :
A current-summing digital-to-analog converter can be constructed by combining a switched, binary-weighted resistor network with an operational amplifier. Contributions to total system errors from reference inaccuracies, resistor ratio tolerances, and operational amplifier errors can be held to less than one part in 105 and are normally far outweighed by error contributions from the switches employed. This correspondence describes a technique which reduces the switch error contributions to an insignificant level.
