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Ferrite bead
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Ferrite bead
A ferrite bead – also called a ferrite block, ferrite core, ferrite ring, EMI filter, or ferrite choke – is a type of choke that suppresses high-frequency electronic noise in electronic circuits.
Ferrite beads employ high-frequency current dissipation in a ferrite ceramic to build high-frequency noise suppression devices.
Ferrite beads prevent electromagnetic interference (EMI) in two directions: from a device or to a device. A conductive cable acts as an antenna – if the device produces radio-frequency energy, this can be transmitted through the cable, which acts as an unintentional radiator. In this case, the bead is required for regulatory compliance to reduce EMI. Conversely, if there are other sources of EMI, such as household appliances, the bead prevents the cable from acting as an antenna and receiving interference from these other devices. This is particularly common on data cables and medical equipment.
Large ferrite beads are commonly seen on external cabling. In addition, various smaller ferrite beads are used internally in circuits—on conductors or around the pins of small circuit-board components, such as transistors, connectors, and integrated circuits.
Beads can block low-level unintended radio frequency energy on wires intended to be DC conductors by acting as a low-pass filter. For example, on unbalanced coax transmission lines (such as video cables), the cable is designed to contain the signal, and beads can be used to block stray common mode current from using the cable as an antenna while not interfering with the signal carried inside the cable. In this use, the bead is a simple form of a balun.
Ferrite beads are one of the simplest and least expensive interference filters to install on preexisting electronic cabling. For a simple ferrite ring, the wire is wrapped around the core through the center, typically five or seven times.[citation needed] Clamp-on cores are also available, which attach without wrapping the wire: this type of ferrite core is usually designed so that the wire passes only once through it. If the fit is not snug enough, the core can be secured with cable ties, or if the center is large enough, the cabling can loop through one or more times. (However, although each loop increases the impedance to high frequencies, it also shifts the frequency of the highest impedance to a lower frequency.) Small ferrite beads can be slipped over component leads to suppress parasitic oscillation.
Surface-mount ferrite beads are available. Like any other surface-mount inductor, these are soldered into a gap in the printed circuit board trace. Inside the bead component, a coil of wire runs between layers of ferrite to form a multi-turn inductor around the high-permeability core.
Ferrite beads are used as a passive low-pass filter by dissipating radio frequency (RF) energy as heat by design.
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Ferrite bead
A ferrite bead – also called a ferrite block, ferrite core, ferrite ring, EMI filter, or ferrite choke – is a type of choke that suppresses high-frequency electronic noise in electronic circuits.
Ferrite beads employ high-frequency current dissipation in a ferrite ceramic to build high-frequency noise suppression devices.
Ferrite beads prevent electromagnetic interference (EMI) in two directions: from a device or to a device. A conductive cable acts as an antenna – if the device produces radio-frequency energy, this can be transmitted through the cable, which acts as an unintentional radiator. In this case, the bead is required for regulatory compliance to reduce EMI. Conversely, if there are other sources of EMI, such as household appliances, the bead prevents the cable from acting as an antenna and receiving interference from these other devices. This is particularly common on data cables and medical equipment.
Large ferrite beads are commonly seen on external cabling. In addition, various smaller ferrite beads are used internally in circuits—on conductors or around the pins of small circuit-board components, such as transistors, connectors, and integrated circuits.
Beads can block low-level unintended radio frequency energy on wires intended to be DC conductors by acting as a low-pass filter. For example, on unbalanced coax transmission lines (such as video cables), the cable is designed to contain the signal, and beads can be used to block stray common mode current from using the cable as an antenna while not interfering with the signal carried inside the cable. In this use, the bead is a simple form of a balun.
Ferrite beads are one of the simplest and least expensive interference filters to install on preexisting electronic cabling. For a simple ferrite ring, the wire is wrapped around the core through the center, typically five or seven times.[citation needed] Clamp-on cores are also available, which attach without wrapping the wire: this type of ferrite core is usually designed so that the wire passes only once through it. If the fit is not snug enough, the core can be secured with cable ties, or if the center is large enough, the cabling can loop through one or more times. (However, although each loop increases the impedance to high frequencies, it also shifts the frequency of the highest impedance to a lower frequency.) Small ferrite beads can be slipped over component leads to suppress parasitic oscillation.
Surface-mount ferrite beads are available. Like any other surface-mount inductor, these are soldered into a gap in the printed circuit board trace. Inside the bead component, a coil of wire runs between layers of ferrite to form a multi-turn inductor around the high-permeability core.
Ferrite beads are used as a passive low-pass filter by dissipating radio frequency (RF) energy as heat by design.
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