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In which of the filter circuits given below, will the bandwidth be equal to the critical frequency?(a) Low-pass(b) High-pass(c) Band-pass(d) Band-stopI got this question in an interview for internship.My enquiry is from Advanced Problems on Filters topic in division Filters and Attenuators of Network Theory

Answer» CORRECT answer is (a) Low-pass

The explanation is: Bandwidth can be calculated by CONSIDERING,

Largest positive value – Smallest Positive Value

Here, in case of the Low-pass FILTER only, the largest positive value will of course be the CRITICAL frequency, beyond which frequencies have to be blocked. Hence, the bandwidth in a Low-pass filter EQUALS the critical frequency.


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