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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
Publication Date: 2005/02/01
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.