Design Optimization of Active Shield Circuits for Digital Noise Suppression Based on Average Noise Evaluation

Retdian A. NICODIMUS  Hiroto SUZUKI  Kazuyuki WADA  Shigetaka TAKAGI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E88-A   No.2   pp.444-450
Publication Date: 2005/02/01
Online ISSN: 
DOI: 10.1093/ietfec/e88-a.2.444
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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A design optimization of active shield circuit using noise averaging method is proposed. The relation between the averaged noise and the design parameters of the active shield circuit such as circuit gain and on-chip layout is examined. A simple design guideline is also provided. Simulation results show that the active shield circuit designed by the proposed optimization method gives a better noise suppression performance of about 28% than the conventional one.