Method and apparatus for reducing electromagnetic radiation
AssigneeThomson Licensing
InventorsBrian Jonathan Cromarty, Lawrence Charles Coan, Edward Allen Hall
Life of this patent
Estimating the term…
Abstract
A method for reducing electromagnetic radiation between devices in electrical communication, including processing signals within a first device in a manner tending to reduce EMR, and electromagnetically isolating the processed signals prior to communicating the signals to a subsequent device.
Claims20
A method for reducing electromagnetic radiation between devices in electrical communication, comprising the steps of:
- coupling a signal from a first printed circuit board comprising a first electrical circuit and a first source of reference potential within an electromagnetically shielded enclosure to a second printed circuit board comprising a second electrical circuit, wherein said second electrical circuit comprises a second source of reference potential, a shield wall electrically connected between said second source of reference potential and said electromagnetically shielded enclosure, and a signal processing circuit coupled to said second source of reference potential;
- processing said signal within said signal processing circuit in a manner tending to reduce electromagnetic interference, wherein a portion of said electromagnetic interference is conducted to said second source of reference potential;
- and
- coupling said processed signal through an aperture in said shield wall to a third electrical circuit located outside of said electromagnetically shielded enclosure.
A printed circuit board for reducing electromagnetic interference, said printed circuit board having an input section and an output section and further comprising:
- a first point of reference potential;
- an input connector mounted to the input section of the printed circuit board, for coupling a signal from a signal source having a second point of reference potential to the printed circuit board;
- a processing element mounted to the input section of the printed circuit board, for processing said signal wherein said processing element is electrically coupled to said first point of reference potential;
- a shield wall, electrically coupled to said first point of reference potential, mounted between said input section and said output section of said printed circuit board and proximate to an output of said processing element, for electromagnetically isolating the input section of the printed circuit board from the output section of the printed circuit board, said shield wall having minimized apertures for passing said signals to the output section;
- and
- at least one output connector, mounted to the output section of the printed circuit board, for outputting the processed signal to a electrical circuit included in a different printed circuit board having a third point of reference potential.
A printed circuit board filter for reducing electromagnetic radiation in signals from an electric circuit, said printed circuit board filter having an input section and an output section, comprising:
- means for coupling a signal within an electromagnetically shielded enclosure from a first printed circuit board comprising a first electrical circuit and a first source of reference potential to a second printed circuit board comprising said printed circuit board filter and a second source of reference potential;
- means for processing said signal within said printed circuit board filter in a manner tending to reduce electromagnetic interference within said signal and coupling said electromagnetic interference to said second source of reference potential;
- means for coupling said electromagnetic interference from said second source of reference potential to said electromagnetically shielded enclosure;
- and
- means for coupling said processed signal to a third electrical circuit located outside of said electromagnetically shielded enclosure.
Dependencies are inferred from the claim text.