A first-order filter can implement only a Butterworth response because first-order stages have no
A) resonant frequency.
B) capacitors.
C) resistors.
D) active devices.

Question

Quizplus · Accepted Answer

A first-order filter has only one reactive component (either a capacitor or an inductor) and no resistive components. Therefore, it cannot create a resonant frequency or any frequency-selective response other than the Butterworth response, which is characterized by a maximally flat magnitude response in the passband.

A First-Order Filter Can Implement Only a Butterworth Response Because