MASH structures for bandpass sigma-delta modulators

Al-Janabi, M., Kale, I. and Morling, R.C.S. (1995) MASH structures for bandpass sigma-delta modulators. In: Proceedings of the IEE Colloquium on Oversampling and Sigma-Delta Strategies for Digital Signal Processing, London, 23 November 1995. IEEE, 3/1-3/6.

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The paper presents simulation results from investigating the behaviour of multistage (MASH) oversampled bandpass sigma-delta (Σ-Δ) modulators for use in analogue to digital converters for high frequency narrowband applications such as the signals out of the intermediate frequency (IF) section of a superheterodyne radio receiver. The bandpass configurations under consideration have in their loop filter a cascade of second-order resonator structures in order to achieve acceptable noise shaping. The quantisation noise in each stage is suppressed by feeding the error of each section into the input of the following stages. It is demonstrated that the triple effective-first-order bandpass MASH structure has significantly better performance compared with the effective-second-order effective-first-order bandpass MASH structure.

Item Type: Book Section
Subjects: University of Westminster > Science and Technology
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Date Deposited: 02 Feb 2012 16:47
Last Modified: 30 Jun 2016 11:29

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