Before revision: Overview The Bode plot of a first-order Butterworth low-pass filter The frequency response of the Butterworth filter is maximally flat (i.e., has no ripples) in the passband and rolls off towards zero in the stopband.
After revision: Overview The Bode plot of a first-order low-pass filter The frequency response of the Butterworth filter is maximally flat (i.e., has no ripples) in the passband and rolls off towards zero in the stopband.