Q help! - RF Cafe Forums
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Post subject: Q help! Posted: Mon Aug 08, 2005 6:39 am
Joined: Tue Aug 02, 2005 1:44 am
People always say a high-Q peaking inductor or low high-Q peaking inductor? What does it mean? What does Q stand for, and high Q better or low Q better?
Post subject: Posted: Mon Aug 08, 2005 11:52 am
Joined: Mon Jun 27, 2005 2:02 pm
Q stands for Quality Factor. It defines the ratio between the energy that is being lost on power dissipation per cycle to the entire energy of the cycle. Another way to put it is:
Qul=Xl/R (Unloaded Quality Factor)
Xl - The reactance of the inductor (2*pi*f*L)
R - The ohmic resistance of the inductor's wire.
High Q is better since it means that there is a lower resistive dissipation in the inductor. There are few ways to achieve that like using air core or lower resistance materials for the wire.
Post subject: Posted: Mon Aug 08, 2005 11:53 am
Q (Quality factor) is the ratio of reactive power to resistive power in a tuned circuit.