A robust NTF zero optimization technique for both low and high OSRs sigma-delta modulators
Yun Du1; Tao He1; Yang Jiang1; Sai-Weng Sin1; Seng-Pan U1,2; R.P.Martins1,3
2012
Conference NameIEEE Asia Pacific Conference on Circuits and Systems (APCCAS)
Source Publication2012 IEEE Asia Pacific Conference on Circuits and Systems
Pages29-32
Conference DateDEC 02-05, 2012
Conference PlaceKaohsiung, TAIWAN
Abstract

This paper introduces a novel loop filter scheme with embedded noise transfer function (NTF) zero optimization in a feed-forward topology. This new structure allows the relaxation of the requirement of the local feedback coefficient. Moreover, the merit of zero optimization is compatible with high oversampling ratio (OSR) when compared with the traditional loop filter. Besides, the practical implementation exhibits less sensitivity to the capacitor ratio mismatches. A second order discrete-time (DT) sigma-delta (ΣΔ) modulator with the proposed loop filter is designed and simulated with Matlab and Cadence. The performance of the modulator can reach 70.1dB/99.3dB SNDR in a 10MHz bandwidth, with OSR 12/48 and the corresponding coefficients in the local feedback 0.4/0.34, respectively. © 2012 IEEE.

DOIhttp://doi.org/10.1109/APCCAS.2012.6418963
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000316598900008
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Cited Times [WOS]:2   [WOS Record]     [Related Records in WOS]
Document TypeConference paper
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Affiliation1.State-Key Laboratory of Analog and Mixed Signal VLSI, Faculty of Science and Technology, University of Macau, Macao, China
2.Also with Synopsys - Chipidea Microelectronics (Macau) Limited
3.On leave from Instituto Superior Técnico/TU of Lisbon, Portugal
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Yun Du,Tao He,Yang Jiang,et al. A robust NTF zero optimization technique for both low and high OSRs sigma-delta modulators[C],2012:29-32.
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