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Balanced side impdedance usually choose 50Ω or 100Ω. It seems 100Ω is better for it will decrease the LNA NF. However, any bad side it will bring? thanks
NF will be better as you expect to have a virtual noiseless voltage gain in front of your LNA due to the impedance ratio of the Balun. For the same reason you will have a decreased linearity of the amplifier.
I hope it can help.
Mazz
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