Abstract: A self-calibrating A/D and D/A converter operating according to the principle of successive approximation includes a weighted converter network, a calibration and correction network, network elements and switches associated with the network elements. A control configuration controls the converter network and the calibration and correction network through the switches for performing a conversion and correction phase as well as a calibration phase. A comparator feeds the converter network and the calibration and correction network back to the control configuration. The control configuration includes a single successive approximation register for controlling the converter network and the calibration and correction network in a multiplex mode.

Abstract: A precision ratioed digital-to-analog data converter. A first latch stores a first digital word having a first numerical value and a second latch stores a second digital word having a second numerical value. A down counter alternately receives data from the first and second latches and is connected to a flip flop device to produce a waveform signal having first and second pulse components of opposite polarity. The first and second pulse components have a duration proportional to the first and second digital words. The output waveform is then inverted through an inverter comprising matched P and N channel MOSFETS. The inverted waveform is then presented to an RC integrator circuit which produces a DC signal. The DC signal is passed through a buffer amplifier connected in a voltage follower configuration.