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matching impedance problems

Question asked by santipito on Jun 24, 2008
Latest reply on Jul 1, 2008 by santipito
Hi, I'm trying to measure the S-parameters of an OTA and I have to make a matching impedance between the analyzer and my circuit. I made it(centering the S11 in the center of the Smith Chart screen of the analyzer) but it seems that the values of the S parameters change with difference values of the elements of the matching network(L,C and R)(values for which there is matching). Is this normal?