Method and system of reducing electromagnetic interference emissions
AssigneeVizionware, Inc.
InventorsTranh T. Tran, Ce Liu, Kenneth W. Egan
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Abstract
A method and system is disclosed for spreading the power associated with digital signals being transmitted to lower electromagnetic interference (EMI) emissions. After being transmitted across a transmission line, a representation of the original digital signal is recovered and provided to a destination device.
Claims62
A method comprising:
- receiving a first digital signal comprising a substantially fixed frequency;
- and
- modifying the first digital signal based upon a first power spreading digital noise signal to produce a spread digital signal.
A system comprising:
- a first input to provide a first binary digital signal comprising a first frequency;
- and
- a power spreading module comprising a second input coupled to the first input, and a first output to provide a first binary representation of the first binary digital signal, wherein the first binary representation of the first binary digital signal has had its power spread relative to the first binary digital signal.
45 The system of claim 40, wherein the transmission line is an integrated circuit board trace.
A method of producing a reduced electromagnetic interference (EMI) emission to meet an EMI objective, the method comprising:
- receiving a first digital signal having a first EMI profile not meeting the EMI objective;
- and
- modifying the first digital signal based upon a first pseudo digital noise signal to generate a second digital signal having a second EMI profile meeting the EMI requirement. (KE)
A method comprising:
- receiving a first signal representative of a first clock;
- determining the first signal meets a first criteria when the first signal has its power spread based upon a first power spreading function;
- spreading the power of the first signal to generate a second signal and providing the second signal to an output node when the first signal meets the first criteria;
- and
- providing the first signal to the output node when the first signal does not meet the first criteria.
A method of reducing electromagnetic emissions in a bit stream comprising (KE)
- receiving a first digital bit stream comprising a first frequency component with a first power profile;
- and
- modifying the first digital bit stream based upon a first power spreading signal to produce a second digital bit stream representing the first frequency component with a second frequency component having a second power profile, wherein the second frequency component is different than the first frequency component.
Dependencies are inferred from the claim text.