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xinxin
Joined: 08 Oct 2003
Posts: 217
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 11 Oct 2003 0:50 Help: bead and choke |
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| Could you let me hnow the difference between bead and choke? How to select a bead for designning a GSM phone?
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 11 Oct 2003 1:40 similar |
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Choke is a folk name for an inductance used to stop signal currents. It generally depends only upon inductance.
A bead is a ferrite material with a hole through it for the wire. It acts like an inductor at low frequencies and at high frequencies an inductor in series with a resistor. This extra resistive loss works better than a pure inductor at stopping signal currents and prevent resonances in the filtering circuit which would make it work less effectively at the resonant frequencies.
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Rayengine
Joined: 18 May 2001
Posts: 314
Helped: 3
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| 11 Oct 2003 9:19 Re: Help: bead and choke |
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Both are inductors.
For selection of choke, we should need to define the electric current through it!
For selection of bead, we should need to define the frequency of use!
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