1. Noise propagation in equipment

Before tackling the subject of filters, it's important to understand not only their purpose, but also the origin of the noise to be filtered. The purpose of a filter is to attenuate high or low frequencies, or even certain frequency bands, as required, and to allow specific frequency bands (functional signals) to pass through.

1.1 Differential mode noise

Differential-mode noise usually comes from power supplies or switching cells. This is often referred to as the "normal" mode, as useful signals are generally transmitted in this mode. In fact, the differential mode is the one in which the currents of the same pair are in opposite directions (figure 1 )....

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The main property of a filter: its attenuation

Bibliography

(1) - DURAND (P.), LEMAN (S.), MAURICE (O.), RAVELO (B.), REINEIX (A.), SOHOR (Y.), STOJANOVIC (M.) - Application de la méthode de Kron à la résolution de problèmes de CEM : exercices corrigés. - Bookelis (2017).
(2) - LAFON (F.) - Développement de...

The book [1], which presents various applications of Kron's method to EMC problems, includes two chapters dedicated to the study of filters against electromagnetic interference. It provides a comprehensive overview of how to calculate attenuation, bearing in mind that there are an infinite number of possible structures. In fact, filters are designed according to need, and can therefore be very different from one another depending...