Minjia Xu
Hubing, T.H.
Hewlett Packard, San Diego, CA, USA
This paper appears in: Electromagnetic Compatibility, IEEE Transactions on Publication Date: Aug. 2003
Volume: 45
,
Issue: 3
On page(s):
478
- 485
ISSN: 0018-9375
Digital Object Identifier: 10.1109/TEMC.2003.815531
Current Version Published: 2003-08-26
Abstract
In multilayer printed circuit boards, the noise on the power bus is influenced by the impedance between the power and ground planes. Power-bus noise estimates require an accurate estimate of the power-bus input impedance. This paper develops a closed-form estimate of the input impedance for circular power-return plane structures. When the structure is lossy (e.g., boards employing embedded capacitance or densely populated boards), the energy reflected from the board edge does not significantly affect the input impedance. In general, the expressions developed here for circular structures can be used to estimate the impedance of lossy power-return plane structures of any shape.
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