Ferrite Beads also known as ferrite chokes are passive devices and they are used to constrict high-frequency signals in electronic components. The ferrite becomes resistive over its intended frequency range and uses up the noise energy in the form of heat.
How
dotheferritebeadswork?
The ferrite bead is connected in series with the power supply rail and is often combined with the capacitors to ground on either side of the bead. This then forms a low-pass filter network, further reducing the high-frequency power supply noise. Use SPICE (Simulation Program with Integrated Circuit Emphasis) or another similar tool to ensure any anti-resonance peaks caused by ferrite or PCB inductive structure does not violate the target impedance limit.
Ferrite
Beadscomeintwocategories:
High-Q Beads - typically used as resonators and must not be used in power isolation circuits
Low-Q Beads - these are also called absorptive beads and they are lossy and make good filter networks because they are designed to absorb high-frequency noise currents and dissipate it as heat
What
toconsiderwhenchoosingFerriteBeads?
Make sure that any voltage drop does not cause the target supply rail to fall below the recommended operating conditions of the device
The ferrite bead is inductive, therefore do not use it with High-Q decoupling capacitors
Applying ferrite beads correctly can be an effective and inexpensive way to reduce high-frequency noise and switching transients
Where
areFerriteBeadsused?
Eliminating high-frequency EMI noise on any circuit design
Description:
"Amobeads" and "Spike Killers" are high-permeability amorphous magnetic
noise-suppression components. Suppressing noise even more effectively than CR snubbers and ferrite beads, they are ideal for high harmonics regulation countermeasures. AMOBEADS Sample Kit.
Description:
Reliable Ni-Sn electrodes High rated current up to
6 AOperating temperature: –55 ºC to +125 ºCPerfect as data line filter and for uncoupling of distribution voltage.
Description:
BLM series ferrite beads from Murata do not
require a ground connection and are ideal for use in circuits with unstable ground lines. At noise frequencies, these ferrite beads are designed to function nearly as resistors, leaving signal wave forms undistorted and reducing the possibility of resonance. The nickel barrier ...
