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Q help! - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


spbhu
Post subject: Q help! Posted: Mon Aug 08, 2005 6:39 am

Lieutenant

Joined: Tue Aug 02, 2005 1:44 am
Posts: 3
Location: NTU
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?
Thanks


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IR
Post subject: Posted: Mon Aug 08, 2005 11:52 am

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello spbhu,

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)

Where:

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.

_________________
Best regards,

- IR


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Guest
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.



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