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I'm trying to obtain the transfer function (Vout/Vin) of some circuits employing an E5062A Vector Network Analyzer.

I've been looking for some information on the topic, but I'm quite confused.

Somebody told me it can be obtained simply as S21*sqrt(Zo).

Additionally, I found some documentation in which it is obtained in a more complicated way:

http://cp.literature.agilent.com/litweb/pdf/5952-1087.pdf [Broken] (pages 24, 23)

http://edocs.soco.agilent.com/display/ads2009U1/volt+gain()

I would like to know which is the correct way to obtain it.

Additionally, in the expressions found in these last documents, I would like to know if it is correct to assume that when I'm measuring my circuit Zl=Zs=Zo=50Ohm and, thus, the reflection coefficients for the source and the load are equal to zero. This would simplify the expressions to S21/(1+S11) in the first case and S21/2 in the second case.

I'm very confused. ¿Could anybody help me?

Thank you very much

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# Voltage Transfer Function determination from S-Parameters

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