In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency_____________?
Correct answer: C. is 12 kHz
- A. is 7 kHz
- B. is 10 kHz
- C. is 12 kHz
- D. cannot be determined
Explanation
For the usual filter approximation, bandwidth equals fH − fL and the resonant frequency is the midpoint: fL = 14 − 4/2 = 12 kHz. Hence the lower cutoff frequency is 12 kHz.
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