As an anti-interference element often used in electronic circuits, ferrite core has a good suppression effect on high-frequency noise and it's of low cost. Ferrite core is generally made of ferrite material, which has different impedance characteristics at different frequency ranges. The impedance is small at low frequency range, but it will rise sharply when the frequency rises. As we all know, the higher the frequency is, the easier the signal will be radiated. In general, the signal line has no shielding layer, so the signal line will receive the external high-frequency signal, superimpose it on the originally transmitted useful signal, and even change the useful signal. In this case, the ferrite core can be used in the circuit to effectively suppress the high-frequency interference signal and make the useful signal transmit normally.

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