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Q factor caculation in ADS. Help

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bkd

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Hi guy. I want to calculate the Q factor of my resonant circuit ( asume that abitrary)
In some material I see that Q=pi*freq*S.delay(1,1).
BUt I did not understand the mathematic meaning of this one. Any can help me .
In some case we will have S.delay(1,1) is negative, so must be used abs(S.delay(1,1)???
If I calculate Q=imag/real so in the resonant frequency Q=0 ???
If I calculate by Q=f0/BW so how to caculate in ADS (BW).
 

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