Measurement and control of electromagnetic interference
AssigneeInternational Business Machines Corporation
InventorsEdward J. Bodette, Michael H. Crowder, Rudolf E. Rehquate
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Abstract
The average EMR emissions of an electronic device may be reduced by implementing an electrically-active modulated termination. For example, the impedance may be continuously varied at one or more termination locations between two metal substructures to cause a like variation in the amplitude of each component of the EMR. According to one approach, cyclically varying the electrical impedance with a period of less than the time interval over which the EMR is measured will result in a reduction in the average measured EMR.
Claims14
A method, comprising:
- continuously varying an electrical impedance at one or more termination locations between first and second substructures that radiate electromagnetic noise to continuously vary the amplitude of the electromagnetic noise at a particular frequency.
An electronic system, comprising:
- a signal generator for generating an electronic signal;
- a first metal substructure and a second metal substructure electrically coupled to the electrical signal generator for radiating electromagnetic noise from the signal generator;
- and
- an impedance controller for continuously varying the impedance at one or more termination locations between the two metal substructures to continuously vary the amplitude of the electromagnetic noise at a particular frequency of the electromagnetic noise.
Dependencies are inferred from the claim text.