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Modeling and experimental verification of substrate coupling and isolation techniques in mixed-signal ICs on a lightly-doped substrate

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5 Author(s)
Van der Plas, G. ; Inter-Univ. Micro-Electron. Center, Leuven, Belgium ; Soens, C. ; Badaroglu, M. ; Wambacq, P.
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Substrate noise coupling caused by digital switching activity on a mixed-signal IC can severely disturb RF circuits on such IC. The authors have developed an accurate approach to predict and model, prior to processing, the substrate noise generation, propagation and resulting analog and RF performance degradation. Measurements on a mixed-signal IC that contains a digital data path (40 K-gates) and an LC-VCO in a 0.18μm CMOS process on a lightly-doped substrate, demonstrated that it is possible to understand the mechanisms of substrate noise impact and to accurately predict noise suppression by isolation techniques (a p+/n-well guard ring structure for the test case).

Published in:

VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on

Date of Conference:

16-18 June 2005