NDLI: Evaluation of active cancellation of substrate noise in mixed-signal ICs

Content Provider	IEEE Xplore Digital Library
Author	Baghchehsaraei, Z. Kristiansson, S. Ingvarson, F. Jeppson, K.O.
Copyright Year	2007
Description	Author affiliation: MC2 Chalmers Univ. of Technol., Goteborg (Baghchehsaraei, Z.; Kristiansson, S.; Ingvarson, F.; Jeppson, K.O.)
Abstract	In mixed-signal integrated circuits interference between noisy and sensitive circuits is a serious problem. Active cancellation of this substrate coupled noise was proposed about a decade ago and has been claimed to be more efficient than passive decoupling (DC/capacitive grounding). Most of the previously presented papers have investigated active decoupling methods using simple, less accurate, resistive network models as the common substrate. In this paper two common active decoupling circuits (feedforward and feedback) have been investigated using an accurate substrate model based on z-parameters. Three different configurations of contacts have been investigated: 1. all the contacts are close to each other; 2. just guard bands are close to each other; and 3. when guard rings are implemented. Conclusions have been reached with the aid of theoretical and simulation based approaches. When distances between contacts are small, the level of suppressed noise highly depends on the type of active decoupling circuit. In this case, if backplane is floating there is an optimum op-amp gain which should be used in order to gain the minimum coupled noise level. Conversely, when distances are large, none of the mentioned effects have been noticed. When guard rings are in use instead of guard bands, regardless of the fact that overall noise level is better, simple DC grounding is preferred.
Starting Page	1
Ending Page	4
File Size	1042815
Page Count	4
File Format	PDF
ISBN	9781424415168
DOI	10.1109/NORCHP.2007.4481065
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-11-19
Publisher Place	Denmark
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Grounding Feedback circuits Circuit simulation Active noise reduction Integrated circuit noise Coupling circuits Interference Noise cancellation Mixed analog digital integrated circuits Noise level
Content Type	Text
Resource Type	Article

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