Question

Determine the order of filter used, when the gain increases at the rate of 60dB/decade on the stop band.

(a) Second-order low pass filter

(b) Third-order High pass filter

(c) First-order low pass filter

(d) None of the mentioned

This question was posed to me in final exam.

Question is taken from Active Filters topic in chapter Active Filters of Linear Integrated Circuits

Answer 1

Right answer is (b) Third-order High pass filter

Navigate through clarity with: The gain increases for high pass filter. So, for a third order high pass filter the gain increases at the rate of 60dB/decade in the stop band until f=fL.