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power analysis to amplitude analysis

Question asked by santipito on Mar 16, 2009
Latest reply on Mar 25, 2009 by dgun
Hello, I'd like to compare my results of S parameters of a two port network made with the network analyzer with the results made in Spice for the same network. The problem is that the results in Spice are in amplitude terms (volts) and in the analyzer are in Power (dBm). The obvious conversion  is V= sqrt((10^P(dBm)/1000)*(Input impedance of the network)) but this doesn´t seem to work because this V doesn't match with the amplitude levels measured at the input of my network with an osciloscope. Do you have any idea of why?  

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