IEICE Electronics Express
Online ISSN : 1349-2543
Analytical method to determine optimal out-of-band gain in multi-bit delta-sigma modulator
Awinash AnandNischal KoiralaRamesh K. PokharelHaruichi KanayaKeiji Yoshida
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2012 Volume 9 Issue 20 Pages 1598-1603

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Abstract

A simple, systematic and deterministic MATLAB simulation which employs Risbo method and analytical simulation is proposed to determine the optimal out-of-band gain to achieve a maximal SNR and the maximum stable amplitude in a multi-bit delta-sigma modulator. Using the proposed method, a 128MS/s, 2MHz signal bandwidth 4th order 2-bit continuous-time delta-sigma modulator is designed and implemented in 0.18µm CMOS technology to verify the concept. As a result, the modulator achieves a peak SNDR of 79.3dB and a dynamic range of 83dB for a 2MHz signal bandwidth (OSR = 32) while consuming only 7.8mW from 1.8V supply.

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© 2012 by The Institute of Electronics, Information and Communication Engineers
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