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How large AC-coupling capacitor for a signal @500MHz

 
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rficdesigner



Joined: 17 Jun 2008
Posts: 20


Post03 Oct 2008 8:19   How large AC-coupling capacitor for a signal @500MHz

Hello everybody

How large should an AC-coupling capacitor be for a signal @500MHz?

Thanks
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kspalla



Joined: 19 Aug 2008
Posts: 154
Helped: 23
Location: Bangalore


Post03 Oct 2008 13:11   How large AC-coupling capacitor for a signal @500MHz

That depends on the input and output matching impedance.
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FvM



Joined: 22 Jan 2008
Posts: 2635
Helped: 431
Location: Bochum, Germany


Post03 Oct 2008 14:46   How large AC-coupling capacitor for a signal @500MHz

One usually select a value, that has a neglectible series impedance. 100 pF would be O.K. for a 50 ohm system, normally.
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