Recent work has shown that high-order single-bit sigma-delta modulators suffer from low-level artifacts, such as idle tones and noise modulation. Techniques that have been proposed to reduce or eliminate these errors include the application of dither inside the one-bit quantizer loop, and selecting a loop filter which makes the modulator chaotic. This paper compares the efficacy of these two approaches by simulating high-resolution sigma-delta modulators suitable for audio-conversion : applications.

Authors: Dunn, Chris; Sandler, Mark
Affiliation: King's College, London, UK
AES Convention: 97 (November 1994) Paper Number: 3926
Publication Date: November 1, 1994
Subject: DSP—Analog to Digital, Digital to Analog

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