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Definition - RF Cafe Forums
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Antonio
Post subject: Definition Posted: Mon Nov 05, 2007 6:42 pm
Captain
Joined: Sat Jun 16, 2007 12:26 am
Posts:
12
Can anyone please define in detail about these???
1) What is the selectivity of a filter?
2) What is the
mathematical expression for selectivity?
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jaslovkel
Post subject: Posted: Tue Nov 06, 2007
11:57 am
Captain
Joined: Tue Jun 26, 2007 10:27 am
Posts: 11
Location: Dallas, TX
Hi Antonio,
Selectivity
is usually another name for how much attenuation is available in the
stopband of a filter in a given frequency range. It depends on what
type of filter it is to what the mathematical representation will be.
This is because different filter approximations will have different
transfer functions. However, the more poles in the transfer function
will make the resulting circuit act as the ideal 'brick wall'. A narrowband
system will require a filter with very high selectivity while a wideband
system will require a low selectivity.
-J
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Antonio
Post subject: Posted: Fri Nov 09, 2007 3:31 am
Captain
Joined: Sat Jun 16, 2007 12:26 am
Posts: 12
Thank you very much for your help.
Posted 11/12/2012
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