US 2003/0214860 A1 · Circuit board having traces with distinct transmission impedances

Abstract

The present invention is an optoelectronic device including a circuit board with a plurality of signal traces, a first ground plane, and a second ground plane. The impedance of a signal trace is determined by which of the first ground plane and the second ground plane is closest to the signal trace. The area of the first ground plane coincident with a first signal trace is left intact in order to set the impedance of the first signal trace, by reference to the first ground plane. The area of the first ground plane coincident with a second signal trace is removed in order to set the impedance of the second signal trace, by reference to the second ground plane.

Claims10

Dependent claims

An optoelectronic assembly comprising:

an optoelectronic device
a circuit board including:
first and second signal traces in electrical communication with the optoelectronic device;
a plurality of dielectric layers mounted below the first and second signal traces;
and
a plurality of ground planes, each ground plane alternating with a dielectric layer of the plurality of dielectric layers;
wherein, for each ground plane of a subset of the plurality of ground planes, a portion of the ground plane does not extend substantially below the first signal trace;
and
wherein a width of the first signal trace and a width of the second signal trace are substantially similar, but an impedance of the first signal trace and an impedance of the second signal trace are substantially different.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/393,217Filed 19 Mar 2003

Priority

19 Mar 2002

Published

20 Nov 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification17 codes

H05K 1/025
High frequency adaptations: impedance arrangements, e.g. impedance matching, reduction of parasitic impedance
H05K 1/0243
High frequency adaptations: printed circuits associated with mounted high frequency components
H05K 1/0253
Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance: impedance adaptations of transmission lines by special lay-out…
H05K 1/023
Reduction of cross-talk, noise or electromagnetic interference: using auxiliary mounted passive components or auxiliary substances

Circuit board having traces with distinct transmission impedances

Life of this patent

Circuit board having traces with distinct transmission impedances

Life of this patent

Abstract

Claims10