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An ELD tracking compensation technique for active-RC CT ΣΔ modulators
Chen-Yan Cai1; Yang Jiang1; Sai-Weng Sin1; Seng-Pan U1,2; Rui. P. Martins1,3
2012-10-16
Conference Name55th IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)
Source Publication2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS)
Pages1096-1099
Conference DateAUG 05-08, 2012
Conference PlaceBoise, ID, USA
Abstract

Excess Loop Delay (ELD) induced feedback DAC nonideality is a dominant factor causing error in the transfer function of CT ΣΔ modulators and eventually leading to instability. This paper will present a novel technique which aims to track the amount of excess loop delay, and compensate by using digital logic elements and an RC feedback network. A 2 order CT ΣΔ modulator with 1-bit DAC was built at transistor-level in 65nm CMOS to demonstrate the efficiency of the method. The Cadence simulation results show that, by using the proposed technique, the modulator can track the ELD up to 50% of the clock period duration and compensate it, leading to 69.2dB SNDR when compared with the ideal value of 70dB SNDR. © 2012 IEEE.

DOIhttp://doi.org/10.1109/MWSCAS.2012.6292215
URLView the original
Indexed BySCI
Language英语
WOS Research AreaComputer Science ; Engineering
WOS SubjectComputer Science, Information Systems ; Engineering, Electrical & Electronic
WOS IDWOS:000312667200274
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Cited Times [WOS]:0   [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
Chen-Yan Cai,Yang Jiang,Sai-Weng Sin,et al. An ELD tracking compensation technique for active-RC CT ΣΔ modulators[C],2012:1096-1099.
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