Virtual ground return for reduction of radiated emissions

Details Virtual ground return for reduction of radiated emissions Virtual ground return for reduction of radiated emissions

2007-11-06

2007-11-06

Dinh, Tuan T. (Department: 2841)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C174S032000, C174S033000, C174S11000P, C174S268000, C333S012000, C333S167000, C333S172000, C333S238000, C333S246000, C375S257000

Reexamination Certificate

active

11010553

ABSTRACT:
A digital apparatus having a cable comprising a plurality of high-speed and low-speed signal carrying conductors, the conductors carrying the low-speed signals are bypassed to a signal ground with selected values of capacitance so as to become virtual signal ground return conductors for the high-speed signal conductors. The selected values of capacitance have a lower impedance then the characteristic impedance of the conductors in the cable. The cable may be a multi conductor cable, a ribbon cable, a flex cable, a twisted pair cable, etc. In a similar fashion, signal conductors on a printed circuit board, not having a separate ground plane layer, may create virtual signal ground returns from the low-speed signal carrying conductors that are proximate to the high-speed signal carrying conductors for reduction of radiated electromagnetic radio frequency interference.

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