Which filter type has ripple in the passband and a sharp cutoff?

Filter design inevitably involves trading off different performance characteristics. A Chebyshev filter is specifically designed to provide a very sharp cutoff, creating a steep transition between the frequencies it passes and those it stops. The necessary trade-off for achieving this steep roll-off is the presence of 'ripple,' which refers to slight, wave-like variations in the amplitude response. In a standard Type I Chebyshev filter, this ripple occurs directly in the passband. By contrast, a Butterworth filter (a common distractor) is known for its 'maximally flat' passband with no ripple, but it suffers from a much more gradual cutoff. 'Passive op-amp' is an oxymoron, as operational amplifiers are active components.