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A ferrite bead is a passive electric component, which is commonly used for suppressing high frequency noise in electronic circuits.
4
votes
Accepted
Ferrite bead for high-speed digital IC
Ferrite beads used to isolate local power supply nets have two effects:
Prevent noise from the main power supply net from reaching the isolated chip.
Prevent noise generated by the isolated chip fro …
9
votes
Accepted
What does 100Ohm @ 100MHz exactly mean in ferrite beads?
Here's a graph of the impedance vs frequency behavior of a "randomly" selected SMT ferrite bead inductor:
You can see that the impedance of the component varies widely over frequency.
Also, the re …
5
votes
Short circuited ferrite bead on PCB
Ferrite beads are meant to have very low resistance at DC, typically less than 5 ohms, and often less than 1 ohm.
If they fail, they tend to fail open-circuit (high resistance) rather than short-circu …