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DC Blocking Capacitors - RF Cafe Forums
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ashishbondia
Post subject: DC Blocking Capacitors Posted: Thu Jan
10, 2008 12:16 pm
Captain
Joined: Wed Aug 16, 2006
8:20 am
Posts: 23
Location: India
Hi,
I am using a 1.5
to 8 GHz LNA for one of my applications. Un fortunately, I have to use
off chip DC blocking Capacitors. How should I select the offchip Blocking
CAP so that it provides very loww insertion loss and doesn't effects
the noise figure much. This application works over 3.25 to 8 GHz
_________________
Ashish Bondia,
Design Engineer- RF
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yendori
Post subject: Posted: Thu Jan 10, 2008
12:25 pm
General
Joined: Thu Sep 25, 2003 1:19 am
Posts: 50
Location: texarcana
Check out the silicon caps from
Vishay. I use them in a similar application. Performance is good, soldering
them to the boards is a nightmare.
http://www.vishay.com/capacitors/silicon/
Rod
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IR
Post subject: Posted: Fri
Jan 11, 2008 2:16 am
Site Admin
Joined: Mon Jun 27,
2005 2:02 pm
Posts: 373
Location: Germany
There are many manufacturers
for RF capacitors: AVX, Murata, Taiyo-Yuden...
To get low insertion
loss, I choose the value for the capacitor to give a reactance Xc of
3 to 4 ohms in the lowest frequency of operation.
Posted 11/12/2012
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