Termination resistor in printed circuit board
AssigneeCray Inc.
InventorSteven V.R. Hellriegel
Life of this patent
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AssigneeCray Inc.
InventorSteven V.R. Hellriegel
Estimating the term…
A printed circuit board having resistors formed therein. A conductive layer composed of two different metals is provided on top of an insulating layer in a printed circuit board. The first metal layer is highly conductive and the second metal layer is highly resistive. For a major portion of the layer, both layers are connected electrically in parallel so that they provide a highly conductive path. At selected locations throughout the printed circuit board, the highly conductive metal is removed providing only the high resistivity metal to act as a resistor between selected locations in the conductive layer. Many resistors are formed at the same time, thus providing ease of fabrication and precision in resistor values across the entire printed circuit board. Following the formation of the resistor, additional insulating and conductive layers are formed to complete the printed circuit board. An electrical connector is then formed between at least one metal layer in the printed circuit board and the resistive layer. This permits easy connection between a conductive layer which is connected to an integrated circuit to provide proper termination voltage and the termination layer, including the termination resistor.
The printed circuit board of claim 38, wherein the selected voltage potential is ground.
The printed circuit board of claim 38, wherein the selected voltage potential is a termination voltage that is different from ground.
The printed circuit board according to claim 38, wherein the first and second conductive layers are parallel to each other, extending parallel to a major face of the printed circuit board and the electrical connector is perpendicular to the two conductive layers, extending through the printed circuit board.
A printed circuit board, comprising:
The printed circuit board of claim 47, further comprising an isolation barrier formed across a straight line path between the electrical connection point and the resistor portion.
A printed circuit board, comprising:
Dependencies are inferred from the claim text.