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What is the purpose of RF/DC choke ?

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acbalbason

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hi guys,

i'm kinda a newbie in RF design. can anyone tell me what is the purpose of and RF/DC choke?

- al :)
 

Re: RF Choke Purpose

RF choke is used to block RF signal but DC current can pass. Generally speaking, a big inductor can act as RF choke.
DC block is used to block DC current but pass the RF signal. Generally speaking, a big capacitor can act as DC block.
 

    acbalbason

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Re: RF Choke Purpose

What wireless man said is 100% correct. I think it's easier to think of it like this:

A big Inductor will look like an Open Circuit at High Frequencies (It Chokes the RF)
A Cap looks like a Short circuit as Freq goes higher.(Till it's self Resonance point)

Cheers
 

    acbalbason

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Re: RF Choke Purpose

When you are a project leader, and you delegate an engineering task to some engineer and he completely blows it off, you can put the "RF Choke" on him until he promises to deliver!
 

    acbalbason

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