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piggsypig
Joined: 14 Jul 2004
Posts: 6
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 21 Jul 2004 3:06 Oscillator |
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Does anyone knows the formula to calculat the resonance bandwidth ? Pls Help 
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mazelk
Joined: 23 Apr 2004
Posts: 107
Helped: 2
Location: COLOMBIA
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| 22 Jul 2004 3:10 Re: Oscillator |
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Hi...
The resonance frequency can be calculate by the inductance and capacitance across the signal node. Generally, this frequency can be get by w=sqrt(1/LC). If you ask about a resonance bandwith, maybe you refer to a band pass filter. Actually, an oscillator can be consider as a band pass filter with positive feedback.....
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piggsypig
Joined: 14 Jul 2004
Posts: 6
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| 22 Jul 2004 3:33 Re: Oscillator |
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 Thanx!!!!
but is that formula applicable to both parallel and series circuits ? 
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mazelk
Joined: 23 Apr 2004
Posts: 107
Helped: 2
Location: COLOMBIA
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| 22 Jul 2004 5:14 Re: Oscillator |
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| This is the general formula. You must get the equivalent parallel circuit (or equivalent capcitances and inductances) betwen those nodes.
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batdin
Joined: 03 Jun 2004
Posts: 181
Helped: 3
Location: Bulgaria
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| 22 Jul 2004 6:44 Re: Oscillator |
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Bandwidth=f_resonance/Quality
For series LCR:
Quality=sqrt(L/C)/R_series
For parallel LCG:
Quality=1/(sqrt(L/C)*G_parallel) where G_parallel=1/R_parallel
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jetset
Joined: 17 Jun 2004
Posts: 145
Helped: 10
Location: Panama
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| 28 Jul 2004 3:49 Re: Oscillator |
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| You can also plot it on a simulation software and get the f3dBHigh and f3dBLow, to get the band width BW = f3dBHigh - f3dBLow. Remember that your reference fequency is the one at which the output of the filter has the maximun amplitude.
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