Noise propagation in equipment
Noise suppression filtering in electronic circuits
Article REF: E3580 V3
Noise propagation in equipment
Noise suppression filtering in electronic circuits

Author : Marine STOJANOVIC

Publication date: August 10, 2018 | Lire en français

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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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