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What do you mean by 3 dB cutoff frequency? Why is it 3 dB,
not 1 dB?
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Answer Posted / piyush
In electronics communication power gain is of great importance
ie Pout/Pin. This gain is expressed in Db ie
gain(Db)=10log10(Pout/Pin).
when the pwr ratio goes to 1/2
Pout/Pin=1/2
at this situation the the gain is -3Db beyond this the
output signal pwr falls to that extent that it becomes
useless thats why we consider 3Db cutoff frequency....
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