How to tune the differential matching?

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jerry117

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differential matching

I meet a problem how to tune the differential matching. This matching network is between the differential output of PA and differential input of Balun. Now, I know the input impedance of Balun is 50 ohm, but I don't know the output impedance of PA. In addition, I also have the reference design that includes this matching network and components values. After I measure the output power of this circuits. The power is smaller than vendor's expect. I guess two reasons. One is the layout. The other is differential mismatching. How should I slove this problem?
 

differential matching network

If you have a reference design try to follow it as you can.
Some general alyout consideration are:
-compact the matching network
-use simmetry
-be aware of grounding of components. This is a very "hot" problem. The vendor of the balun usually gives some layout advices. Follow them carefully.
-use component with good Q.
Bye
Mazz
 

matching network differential

You might try @gilent app note AN1373-7 (5988-2923EN.pdf) to start.
 

tune differential matching

I think it is better you attach the schematic of your diff amp here! It is simple to us to discuss more on your topic...

:lol:
 

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