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Eliminable-Noise Dithering in MASH Digital Delta-Sigma Modulator Based on Error-Feedback Modulator
Author(s)
Achanapornkul, Suphom
Date Issued
June 1, 2025
Type
Article
Abstract
Conventional LFSR-based dithering in the digital delta-sigma modulator (DDSM) is widely used to suppress spurious tones in the DDSM at the expense of the increased modulator’s noise floor. In this work, we present a new dithering technique using the error feedback modulator (EFM) that can both suppress spurious tones and eliminate the dithering noise. The proposed technique also offers the precise frequencytuning ability beneficial for fractional-N frequency synthesizers. Moreover, the hardware complexity of the DDSM using the proposed dithering technique can be reduced significantly with multistage dithering and a short wordlength. Mathematic proof and simulation results have been given to show that the proposed technique efficiently suppress spurious tones without raising the low-frequency noise floor. The proposed technique shows the improved performance compared to previously reported spur reduction techniques.
Citation
Ecti Transactions on Electrical Engineering Electronics and Communications, 23(2), 2025