Digital-to-analog conversion apparatus using temperature compensated feedback output amplifier

摘要

A serial data input to analog voltage output converter uses an R adder for continually adding a given digital input word to an accumulated result and providing either a positive or negative overflow whenever the accumulated result exceeds the capacity of the adding device. The frequency of occurrence of overflow is filtered to provide the analog output signal. Compensation techniques provide high accuracy despite temperature dependent resistances and current leakages incurred in MOS or other switch and filtering circuitry.