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SESK: Stuff Everyone Should Know · sesk.info/hame-chebyshev-filter

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

The Chebyshev filter trades passband ripple for a sharper cutoff.

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  1. Butterworth filter
  2. Passive op-amp filter
  3. Chebyshev filter ✔

Why: A Chebyshev design allows small ripples in the passband. In return it rolls off faster than a Butterworth filter of the same size.

Huh, didn't know that: An elliptical filter has an extremely sharp cutoff with one or more notches in the stop band (E7C06).

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Some DSP engineers, faced with a problem, think, I know, I'll use an FIR filter. Now they have a convoluted problem.
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References

Answer: Chebyshev filter. A Chebyshev design allows small ripples in the passband. In return it rolls off faster than a Butterworth filter of the same size.

  1. NCVEC 2024-2028 Amateur Extra Question Pool, E7C05 (4th errata, Feb. 4, 2026) www.ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    D. A Chebyshev filter
    Checked 2026-10-11.
  2. NCVEC 2024-2028 Amateur Extra Question Pool, E7C06 (4th errata, Feb. 4, 2026) www.ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    C. Extremely sharp cutoff with one or more notches in the stop band
    Checked 2026-10-11.

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