Questions tagged [ferrite-bead]

A ferrite bead is a passive electric component, which is commonly used for suppressing high frequency noise in electronic circuits.

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602 views

Regarding Ferrite Bead

What is a ferrite bead? How is it different from an inductor? How is it rated? What are its important parameters? What allows me to chose between an inductor or ferrite bead to filter out frequencies ...
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1answer
3k views

What does 100Ohm @ 100MHz exactly mean in ferrite beads?

I am trying to understand the parameters of ferrite beads and having trouble in understanding the impedance vs frequency parameter. What does 100Ohm at 100MHz exactly mean? Does it mean that the ...
8
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1answer
3k views

How do I choose a ferite bead for power supply filtering?

I want to put a ferite bead on positive SMPS supply rail that goes to analog part of the mixed digital/analog circuit. Now on parametric search at Digikey I can see several parameters: Current ...
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5answers
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Ferrite bead position

I wish to use some extra power supply filtering for my DAC, ADC, CPLD and OpAmp devices. In this question I got the point about the global locations for ferrite beads. If I understood correctly, the ...
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1answer
4k views

How to select appropriate ferrite beads for power supply rails [duplicate]

I'm making a camera board using IMX225LQR image sensor. For this sensor you need 3.3V analog power supply and 1.8V, 1.2V digital power supplies. Also, the 1.8V power pins are close to the 3.3V analog ...
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2answers
910 views

Ferrite Bead: How much impedance do I need?

I understand that ferrite beads can be used to reduce noise from a power supply input to an IC. I understand that one selects ferrite beads based on its resistance at the noise frequency one wishes ...
8
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2answers
8k views

What's the purpose of a ferrite bead inductor on this circuit?

I'm studying the analog voltage reference circuit described in the AVR450 Application Note - Battery Charger for SLA, NiCd, NiMH and Li-Ion Batteries, which schematic is below (copied from page 38). ...
4
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2answers
1k views

Where to connect shield and ferrites in PCB with isolated planes

I have a device which has two sections of the PCB completely isolated form each other, but connected by an isolator IC (PN: ????). I think I need to shield the whole device for reducing EMI because ...
3
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2answers
488 views

Magnetic core transfer loops (logic)

I have an interest in "alternative" logic gates, as in not silicon transistors. I have built RAM in a little game called "Powder Game", constructed "one-off" logic gates out of exploding lattices of ...
6
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1answer
2k views

What is the component on the schematic indicated by the symbol of a diagonal rectangle with a line through it?

I can't for the life of me, figure out what these diagonal rectangles are... Help?
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3answers
25k views

Does the position of the Ferrite bead matter?

Often I will see a ferrite bead a couple of inches from one end of a cable. Does the position of a ferrite bead really matter?
3
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1answer
2k views

What is the effect of Saturation on a Ferrite Bead Inductor?

This circuit shows the "current channel" of an energy meter. IA_IN are the two inputs for a shunt (typically 250 uOhms) while TP1 is the connection to the energy measurement IC, which uses the 3.3 V ...
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0answers
368 views

Adding a ferrite bead to source of mosfet (smps)

We are designing a SMPS (ultra low noise) based on TI schematics http://www.ti.com/lit/df/tidrgc2/tidrgc2.pdf (5V, 15W quasi resonant) In order to reduce EMI (we have some ringing across Mosfet when ...
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0answers
113 views

A question about ferrite bead used for differential mode filter

At high frequencies sometimes ferrite beads are used instead of inductors as normal/differential mode filters. I draw Figure 1 and Figure 2 below showing LC and Ferrite bead C differential filters: ...