1.

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-stopThe question was posed to me during a job interview.My doubt is from Advanced Problems on Filters in chapter Filters and Attenuators of Network Theory

Answer»

Right answer is (a) Low-pass

The best explanation: 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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