FREMGANGSMAATE FOR OMDANNELSE AV ET ANALOGT INNGANGSSIGNAL TIL ET DIGITALT SIGNAL, OG ANALOG/DIGITALOMFORMER

摘要

Analog-to-digital converters specifically optimized for use in seismic applications operate on the delta or delta-sigma modulator principles. A single incremental step voltage is supplied to a pair of field effect transistors 60, 62 controlled by logic circuitry 12 for supplying the incremental step voltage to an inverting op amp 72 supplying an integrator 16 for generating a predicted value g(t), whereby the effects of component instabilities or mismatches are minimized.