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US 6,477,060 B1Granted
Dual channel bus routing using asymmetric striplines
AssigneeIntel Corporation
InventorsErik W. Peter, Jeffrey M. Shuey, Ronald Martin
Life of this patent
Estimating the term…
Abstract
A printed circuit board utilizes asymmetric striplines to accommodate a large number of transmission lines on a six-layer board. The asymmetric striplines are formed from two signal layers that are sandwiched between two reference planes such that the traces in each signal layer form asymmetric striplines with the two reference planes. Two additional signal layers are arranged on the outside of the reference planes so as to form microstrips with the reference planes.
Claims20
A printed circuit board comprising:
- first and second signal layers;
- first and second reference planes arranged between the first and second signal layers such that a trace in the first signal layer functions as a microstrip with the first reference plane, and a trace in the second signal layer functions as a microstrip with the second reference plane;
- third and fourth signal layers arranged between the first and second reference planes such that a trace in the third signal layer functions as an asymmetric stripline with the first and second reference planes, and a trace in the fourth signal layer functions as an asymmetric stripline with the first and second reference planes;
- a first dielectric layer between the first signal layer and the first reference plane;
- a second dielectric layer between the second signal layer and the second reference plane;
- a third dielectric layer between the third signal layer and the first reference plane;
- a fourth dielectric layer between the fourth signal layer and the second reference plane;
- and
- a fifth dielectric layer between the third and fourth signal layers.
6 more elements
A printed circuit board comprising:
- a first bus channel having a first set of microstrip traces and a first set of asymmetric stripline traces;
- a second bus channel having a second set of microstrip traces and a second set of asymmetric stripline traces;
- wherein the first and second set of asymmetric stripline traces are arranged between two reference planes.
A printed circuit board assembly comprising:
- a printed circuit board having a first bus channel and a second bus channel;
- a memory controller having a first bus interface coupled to the first bus channel and a second bus interface coupled to the second bus channel;
- a first memory device coupled to the first bus channel;
- and
- a second memory device coupled to the second bus channel;
- wherein the printed circuit board comprises:
- first and second reference planes;
- first and second signal layers having traces arranged to function as microstrips with the first and second reference planes, respectively;
- and
- third and fourth signal layers having traces arranged between the reference planes to function as asymmetric striplines with the reference planes.
7 more elements
Dependencies are inferred from the claim text.