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a question about impadence matches of balun

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lily1981216

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A balun is used in my circuit to convert the differential ends to a single end to test the chip by network analyzer. The input impedance is too large cause the input is the gate of MOS. The R ratio of the balun is 1:1. How can I implement the impedance match? I have two kinds of configuration as described:



Which is better?
 

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