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Topic Title: Circuit Modelling for EMC.
Topic Summary: Simplifying the mathematics.
Created On: 10 February 2014 10:48 AM
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 10 February 2014 10:48 AM
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Joined: 18 January 2003

It is not necessary to be an expert in electromagnetic field theory to analyse the problems of electromagnetic interference (EMI). It is possible to simplify the mathematics to a point where any circuit designer can create a circuit model of the EMI coupling mechanisms of the signal link-under-review. This model is capable of simulating the response of the link over the range of frequencies at which interference reaches a peak value.

General-purpose test equipment can be used to measure the actual response. Comparing the simulated response with the measured response demonstrates the validity of the model and provides a definition of the EMC characteristics of the link. The technique can be developed to enable EMC requirements to be treated in the same way as any other design requirement.

A series of articles on the use of this technique is being published in the Electronics World magazine. The first article can be found on page 38 of the February 2014 issue. A free copy of this issue is available for download, from
Ian Darney

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