Optimum "L" filter

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Linear analog electronic filters
Network synthesis filters Butterworth filter Chebyshev filter Elliptic (Cauer) filter Bessel filter Gaussian filter Optimum "L" (Legendre) filter Linkwitz-Riley filter Image impedance filters Constant k filter m-derived filter Zobel network (constant R) filter Composite image filter Simple filters RL filter RC filter RLC filter LC filter
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The Optimum "L" filter (also known as a Legendre filter) was proposed by Athanasios Papoulis in 1958. It has the maximum roll off rate for a given filter order while maintaining a monotonic frequency response. It provides a compromise between the Butterworth filter which is monotonic but has a slower roll off and the Chebyshev filter which has a faster roll off but has ripple in either the pass band or stop band. The filter design is based on Legendre polynomials which is the reason for its alternate name and the "L" in Optimum "L".

[edit] See also

• Bessel filter
• Butterworth filter
• Chebyshev filter
• Elliptic filter

[edit] External links and references

• Kuo, Franklin F. (1966). Network Analysis and Synthesis. Wiley. ISBN 0-471-51118-8.  Second Edition.