Reduction of switching noise in high-speed circuit boards

Details Reduction of switching noise in high-speed circuit boards Reduction of switching noise in high-speed circuit boards

1996-08-28

1999-11-09

Kincaid, Kristine

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

174255, 361816, H05K 900

Patent

active

059818697

ABSTRACT:
The present invention features a method of noise reduction in both packaging structures and circuit boards, as well as articles of manufacture that result from this method. Both the method and the articles weaken and effectively reduce undesirable noise signals that propagate as waves to and from the perimeter of circuit boards. The method of the invention adds absorbent materials in various structural configurations to strategic areas about the exterior and interior of the circuit boards. In order to absorb noise signals, these added materials are placed around lines and vias of the circuit boards, as well as at their ends and perimeters. Non-absorbent materials must contiguously surround the lines and vias; otherwise, absorbent material will absorb desired signals, as well as noise. The method of this invention tries to match the dielectric constant of the added, absorbent materials with the dielectric constant of the non-absorbent, dielectric materials found on the circuit board. The absorbent materials are known as "lossy" dielectrics, and are chosen in some instances for their magnetic, rather than their electric, absorption properties.

REFERENCES:
patent: 3765912 (1973-10-01), Gates, Jr. et al.
patent: 5367956 (1994-11-01), Fogel, Jr.
patent: 5428506 (1995-06-01), Brown et al.
patent: 5594218 (1997-01-01), Diaz et al.

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