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

Retdian A. NICODIMUS  Shigetaka TAKAGI  Kazuyuki WADA 

Publication
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: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
digital noise,  substrate coupling,  active noise cancellation,  active shield circuit,  mixed-signal integrated circuits, 

Full Text: PDF(322.7KB)

Summary: 
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.