Conventional sigma-delta (Σ∆) analog-to-digital (Ad) converters are based on an analog Σ∆ modulator followed by a digital filter. In this paper we propose a new architecture of a first-order Σ∆ modulator that needs no active analog components. We call this Σ∆ modulator "digital-only," and implement with it Ad converters in Fpga's or directly in the software of microprocessors. We here discuss aspects of the dynamic behavior of the proposed structure.
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