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Common- and differential-mode signaling and filtering

2003
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Thesis / Dissertation Description

"Common-mode chokes are widely used as suppression filters against interference of common-mode noise in high-speed differential signaling. This thesis focuses on investigating the characteristics of common-mode chokes. Mixed-mode S-parameters are presented as a useful concept for explaining the modal operation of differential circuits.Three methods for measuring common-mode and differentia-mode S-parameters of common-mode chokes are demonstrated. The three methods involve (1) ABCD chain matrix, 2) using hybrid couplers and 3) modal decomposition. Each measurement method provides a specific level of accuracy. The modal decomposition method can work up to 10GHz.SPICE equivalent circuit model of common-mode chokes and the extraction of model parameters are provided. Parameter extraction of the equivalent circuit model is performed using mixed-mode S-parameters"--Abstract, page iii.

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