Active Shield Circuit for Digital Noise Suppression in Mixed-Signal Integrated Circuits

Retdian A. NICODIMUS  Shigetaka TAKAGI  Kazuyuki WADA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E88-A   No.2   pp.438-443
Publication Date: 2005/02/01
Online ISSN: 
DOI: 10.1093/ietfec/e88-a.2.438
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
digital noise,  substrate coupling,  active noise cancellation,  active shield circuit,  mixed-signal integrated circuits,  

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An active shield circuit which effectively reduces the substrate noise on the entire area inside the guard ring regardless of the noise source position is proposed. Simulation result shows that the proposed circuit can reduce the noise level to -85 dB while a conventional guard ring gives -52 dB.