Patent Number: 6,310,536

Title: Termination resistor in printed circuit board

Abstract: 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.

Inventors: Hellriegel; Steven V. R. (Bainbridge Island, WA)

Assignee: Cray Inc.

International Classification: H01C 7/00 (20060101); H05K 1/16 (20060101); H05K 3/42 (20060101); H01C 001/012 ()

Expiration Date: 10/30/2018