[SOLVED] finding cutoff frequency of a bandpass filter from simulation curve

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ashyma

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I am very confused regarding the cutoff frequency:

i want to find the cutoff frequency of a bandpass filter from the simulation curve... lets say the gain is 41.8dB so what is the 3db cutoff frequency ? I have attached a curve for reference ,,, thanks
 

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Your 3dB cutoff frequency is the frequency at gain 38.8dB (41.8dB - 3dB).
 
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    ashyma

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The cutoff frequency is when the output level has dropped -3dB which is 0.707 times the maximum amplitude and is half the output power.
Fred D. told you the lower cutoff frequency. You can see the upper cutoff frequency yourself.
 
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    ashyma

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Thank you every one
 

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