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Conducted noise - Differential and Common mode noise

EMC TEsting    

On the previous article we have seen what the conducted noise is and how it links with the radiated noise to. CISPR regulations require that you have two tests setup for testing conducted and radiated noise. In regards to the conducted noise, while the standards require that the absolute value should be below a certain threshold, understanding what contributes to the total noise, could be beneficial for the design. Indeed the conducted noise is made of two components, Differential Mode (DM) and Common Mode (CM). The two components summed together is what we measure with the spectrum analyzer or the receiver. In this article we see the details of the DM and CM. Out of the values the designer can better leverage how to dimension the EMI filter, either for the DM or CM noise.  

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