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The practical limits of MASH Delta-Sigma Modulators designed to maintain very long controllable sequence lengths for structured tone mitigation

Telli, Ali T. and Kale, Izzet (2009) The practical limits of MASH Delta-Sigma Modulators designed to maintain very long controllable sequence lengths for structured tone mitigation. In: Proceedings of the 10th IEEE Annual Wireless and Microwave Technology Conference (WAMICON '09). IEEE, pp. 1-5. ISBN 9781424445646

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Official URL: http://dx.doi.org/10.1109/WAMICON.2009.5207243

Abstract

The delta-sigma modulator (DSM) is an essential block for a Fractional-N (FN) frequency synthesizers and is used for generating the fractional part of the division ratio. Digital DSMs (DDSM) with rational input and rational initial conditions can be thought as Finite State Machines (FSM) and they always produce finite length sequences in accordance with the applied input. To provide smooth quantization noise power distribution (tone free) and to get rid of structured tones, the modulator should complete its cycle and return to initial starting state. This method is called maintaining controllable sequence length. In this paper, the practicality of this method will be investigated for DDSMs composed of up to 5th order MASH 1-1-1-1-1 structures by considering lock time requirements of the synthesizers designed for wireless transceiver applications such as GSM900, DCS-1800, UMTS(WCDMA),WLAN, ZigBee and Bluetooth.

Item Type:Book Section
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:7403
Deposited On:29 Jan 2010 10:25
Last Modified:12 Aug 2010 10:09

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