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Passive Filters

Q1: In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency

A is 7 kHz

B is 10 kHz

C is 12 kHz

D cannot be determined

ANS:C - is 12 kHz

Resonant frequency = G.M(geometric mean) of f1 & f2.
fr = root of (f1 & f2).

For High quality factor circuits Q >> 5, ckts approximately A.M of f1 & f2. fr = 0.5(f1 + f2).



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