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A Simulated Comparison of Dithered and Chaotic Sigma-Delta Modulators

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.

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