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US 2006/0221585 A1Published application
Apparatus and method for reducing noise coupling
OwnerColin Brenchinventor
Life of this patent
Estimating the term…
Abstract
Method and structure for modifying the boundary conditions between edges of adjacent or nearby split power planes in a circuit layout. The modified boundary conditions reduce coupling between the power planes, which reduces noise coupling between the power planes and allows for closer spacing between the power planes. In one embodiment the modified boundary conditions include a high impedance adjacent a low impedance.
Claims23
Circuit layout, comprising:
- at least two power distributions wherein a first power distribution includes a first power rail and a first return rail, and a second power distribution includes a second power rail and a second return rail, said first and second power distributions providing power and return for respective and separate circuits, a decoupling capacitance across said power rail and return rail of a first of said two power distributions, said capacitance being disposed at an edge of said first power distribution adjacent said second power distribution, said second power distribution being open circuit impedance between its power rail and return rail along an edge that is adjacent said edge of said first power distribution in an area near said capacitance, wherein said edges are more closely spaced with respect to each other than they would otherwise be spaced without said capacitance and adjacent open circuit impedance area.
A method for closely spacing split power distributions in a circuit, comprising:
- decoupling a power rail and return rail of a first power distribution with a short circuit impedance by disposing said short circuit impedance in an edge region of said first power distribution that is adjacent an edge region of a second power distribution, and providing an open circuit impedance between a power rail and return rail of said second power distribution near said short circuit impedance,
- wherein said edges are more closely spaced with respect to each other than they would otherwise be spaced without said capacitance and adjacent open circuit area.
Circuit layout, comprising:
- at least two split power planes wherein a first power plane having a first edge portion and a second power plane has a second edge portion, said first and second edge portions being adjacent and parallel with each other for a distance, said first and second edge portions having different boundary conditions to reduce coupling between said first and second power planes.
Dependencies are inferred from the claim text.