Electricity: electrical systems and devices – Miscellaneous
Patent
1989-08-22
1990-09-04
Thompson, Gregory D.
Electricity: electrical systems and devices
Miscellaneous
29831, 29846, 174 35R, 174 36, 361406, 361424, H05K 900
Patent
active
049549294
ABSTRACT:
A multi-layer printed circuit board is constructed to suppress radio frequency interference (RFI) generated by high frequency clock and data signals therein. Suppression is achieved by positioning clock lines carrying the clock signal on a first voltage reference layer proximate to a second voltage reference layer. The two layers shield the clock signal from the signal lines on other layers. Noise may be further reduced by forming bridges in the second voltage reference layer proximate to the clock lines so that the bridges span the width of the clock line. Capacitors are also preferably utilized to further suppress radiated noise. The capacitors provide AC coupling between the first and second voltage reference layers so that a low impedance path is provided for high frequency noise generated by the clock signal. The second voltage reference layer thus operates as an effectively continuous shield between the bridges.
REFERENCES:
patent: 3398232 (1968-08-01), Hoffman
patent: 3680005 (1972-07-01), Jorgensen et al.
patent: 4498122 (1985-02-01), Rainal
patent: 4689442 (1987-08-01), Ozaki
patent: 4845311 (1989-07-01), Schreiber et al.
AST Research Inc.
Thompson Gregory D.
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