WestminsterResearch

Effective-fourth-order resonator based MASH bandpass sigma-delta modulators

Al-Janabi, Mohammed and Kale, Izzet and Morling, Richard C.S. (1997) Effective-fourth-order resonator based MASH bandpass sigma-delta modulators. In: Proceedings of the 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, vol.3, Munich, Germany, April 1997. IEEE, pp. 2493-2496. ISBN 0818679190

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Official URL: http://dx.doi.org/

Abstract

Two novel effective-fourth-order (eighth-order) resonator based MASH (MultistAge noise SHaping) bandpass Σ-Δ modulators are introduced at the behavioural level and subsequently examined by simulations utilising the ALTA SPW environment. The considered bandpass configurations have in their loop filter a cascade of standard second-order resonator structures in order to achieve appropriate noise shaping. The quantisation noise in each stage is suppressed by feeding the error of each section into the input of the following stage. It is demonstrated in this paper that the quadruple effective-first-order cascade configuration has significantly better performance as well as conforming more closely with theory in comparison with the effective-second-order effective-second-order cascade. The superior performance of the former can be attributed to the cumulative effect of the multi-bit outputs as well as the presence of more notch filters.

Item Type:Book Section
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:10294
Deposited On:02 Feb 2012 16:36
Last Modified:02 Feb 2012 16:36

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