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Recommendation of Discrete Cost Effective Balun (Read 2795 times)

pancho_hideboo

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Recommendation of Discrete Cost Effective Balun
Mar 13^th, 2008, 3:31am

Hi.

I'm now studying cost effective balun using discrete L and C.

My TX PA outputs are open drain of differential pair.
So I have to feed Vdd via external inductor or resistor.

And I have to share TX differential pins with RX differential LNA inputs.

Is there any good cost effective balun structure using discrete L and C for this purpose ?

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ACWWong

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Re: Recommendation of Discrete Cost Effective Balu
Reply #1 - Mar 13^th, 2008, 3:46am

An LC "bridge" configuration should be ok if you only need narrow band, and the LNA input Z and TX output Z are similiar (i.e. same balun impedance tranform useable for both rx and tx modes)

i quick google gives
http://www.odyseus.nildram.co.uk/RFMicrowave_Circuits_Files/Balun%20Design.pdf
and the first method is the lumped LC configuration i'm suggesting.

hope it helps

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pancho_hideboo Senior Fellow Offline Posts: 1424 Real Homeless	Re: Recommendation of Discrete Cost Effective Balu Reply #2 - Mar 14^th, 2008, 1:03am Thanks for valuable information.
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