An Element Rotation Algorithm for Multi-bit DAC Nonlinearities in Complex Bandpass \Delta\SigmaAD Modulators

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17th International Conference on VLSI Design

Mumbai, India

January 05-January 09

ISBN: 0-7695-2072-3

	ASCII Text	x
	Hao San, Haruo Kobayashi, Shinya Kawakami, Nobuyuki kuroiwa, "An Element Rotation Algorithm for Multi-bit DAC Nonlinearities in Complex Bandpass \Delta\SigmaAD Modulators," VLSI Design, International Conference on, pp. 151, 17th International Conference on VLSI Design, 2004.

	BibTex	x
	@article{ 10.1109/ICVD.2004.1260917, author = {Hao San and Haruo Kobayashi and Shinya Kawakami and Nobuyuki kuroiwa}, title = {An Element Rotation Algorithm for Multi-bit DAC Nonlinearities in Complex Bandpass \Delta\SigmaAD Modulators}, journal ={VLSI Design, International Conference on}, volume = {0}, year = {2004}, issn = {1063-9667}, pages = {151}, doi = {http://doi.ieeecomputersociety.org/10.1109/ICVD.2004.1260917}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, }

	RefWorks Procite/RefMan/Endnote	x
	TY - CONF JO - VLSI Design, International Conference on TI - An Element Rotation Algorithm for Multi-bit DAC Nonlinearities in Complex Bandpass \Delta\SigmaAD Modulators SN - 1063-9667 SP EP A1 - Hao San, A1 - Haruo Kobayashi, A1 - Shinya Kawakami, A1 - Nobuyuki kuroiwa, PY - 2004 KW - null VL - 0 JA - VLSI Design, International Conference on ER -

Hao San, Gunma University, Japan

Haruo Kobayashi, Gunma University, Japan

Shinya Kawakami, Gunma University, Japan

Nobuyuki kuroiwa, Gunma University, Japan

DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/ICVD.2004.1260917

This paper presents a technique for improving the resolution of complex bandpass \Delta\SigmaADCs which are used for wireless communication systems. Oversampling and noise-shaping are used to achieve high accuracy of a \Delta\SigmaAD modulator. However when a multi-bit DAC is used inside a modulator, nonlinearities of the DAC are not noise-shaped and the SNR of the \Delta\SigmaADC degrades. For the conversion of complex intermediate frequency (IF) input signals, a complex bandpass \Delta\SigmaAD modulator can provide superior performance to a pair of real bandpass \Delta\SigmaAD modulators of the same order. This paper proposes a new noise-shaping algorithm - implemented by adding simple digital circuitry - to reduce the effects of nonlinearities in multi-bit DACs of complex bandpass \Delta\SigmaAD modulators. We have performed simulation with MATLAB to verify the effectiveness of the algorithm, and the results show that the proposed algorithm can improve the SNR of a complex bandpass \Delta\SigmaADC with nonlinear internal multi-bit DACs.

Citation:

Hao San, Haruo Kobayashi, Shinya Kawakami, Nobuyuki kuroiwa, "An Element Rotation Algorithm for Multi-bit DAC Nonlinearities in Complex Bandpass \Delta\SigmaAD Modulators," vlsid, pp.151, 17th International Conference on VLSI Design, 2004

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