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impedance matching performance verification using vna

Question asked by robismyname on Dec 10, 2012
Latest reply on Dec 10, 2012 by Dr_joel
I have a test board that has a TI reference design for a Lattice type balun (see attached). The lattice balun on one side is assumed to be matched to the cc2540 at 70 +30j (obtained from TI's spec sheet). And the other side of the lattice balun is assumed to be matched to 50 ohms (obtained from TI's spec sheet).

What I want to do is measure the impedance of the TI referenced design lattice balun on the differential side and then on the single ended side but my VNA does not support differential inputs.

Since my VNA does not support differential inputs how can I measure how well the impedance is matched for the differential side of the balun with a VNA and then the single ended side of the balun with a VNA?  

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