Hi,
after reading a lot of papers, I am totally confused by the definition of quality factor of inductor. That is , should we take the electric energy that is inevitably stored in a real inductor into the account? if so should that form of energy be added to or subtracted from the dominant magnetic energy stored in the inductor. If the former is the correct definition, we should get the same definition of Q of an inductor as that of a resonator, If the latter is correct, we get the commonly used formula Q = -Im(y11)/Re(y11).

Thanks.

Julian

hi ,
            i have one doubt regarding Q factor of a circuit.generally i heard Q is defined for 2nd order system only,is this true?i saw in one razaavi paper,in that  he used to find Q factor for any circuit by using the standard definition Q=ω*.5*(dΦ/dw)(i hope u understood the formula),in the above expression ω means resonance frequency or corner frequency.Instead he used direct ω as variable frequency.the following is the paper

http://www.ee.ucla.edu/~brweb/papers/Journals/BRSept08.pdf        
   just refer appendix-1

Thanks for your time.
Regards,