Printed circuit wiring board having a doped semi-conductive regi

Details Printed circuit wiring board having a doped semi-conductive regi Printed circuit wiring board having a doped semi-conductive regi

1985-07-15

1987-06-09

LaRoche, Eugene R.

Wave transmission lines and networks

Dissipating terminations for long lines

Fluid-cooling

338216, 338314, 357 51, H01P 124

Patent

active

046723358

ABSTRACT:
A matched load for an unloaded terminating end of a signal transmission line on a printed circuit wiring board avoids reflecting pulses back down the line. A non-reflective attenuation region is provided under the unloaded terminating end, such region being wedge-shaped and doped to a reduced resistivity, and situated in the silicon substrate of the board. Data pulses at the unloaded terminating end of the transmission line, modulated at the selected operating frequency of the board, are substantially attenuated by the doped region.

REFERENCES:
patent: 3150325 (1964-09-01), Blattner
patent: 3432792 (1969-03-01), Hatcher, Jr.
patent: 3541474 (1970-11-01), Holton
patent: 3911382 (1975-10-01), Harth et al.
patent: 4383227 (1983-05-01), de Ronde

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