Highly linear digital/analog conversion device

摘要

A digital-to-analog conversion device equipped with a first and second delta-sigma modulator (F1,F2) of the second order, a first and second differentiator (9,10) a three-stage digital-to- analog converter (DAC)(3DA) and a low-pass (TP), in which the output signal of the low pass is simultaneously the output signal (A) of the device. A signal (k) between a first and second delay stages (5,7) of the first modulator (F1) is fed to the input of the second modulator (F2), and output signal (RA) of the latter is fed to a feedback input (RE) via two series-connected differentiators (9,10). E three-stage digitiser (quantiser) (3) is provided in the first modulator and supplies a first and second range bit (B1,B2) which are converted by the three-stage DAC to an analog signal (A3) for feeding to the low-pass (TP).