Passive butterworth filter design

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SUMMARY

The discussion focuses on designing passive Butterworth filters, emphasizing the calculation of inductance (L) and capacitance (C) using the Butterworth polynomial, cutoff frequency, and load resistance. Participants recommend consulting Butterworth's original paper for clarity on solving the necessary polynomials. The use of continued fractions in this context is questioned, highlighting a gap in available resources for practical implementation.

PREREQUISITES
  • Understanding of passive filter design principles
  • Familiarity with Butterworth polynomials
  • Knowledge of cutoff frequency calculations
  • Basic skills in solving electrical circuit equations
NEXT STEPS
  • Study the Butterworth polynomial derivation in detail
  • Explore methods for calculating cutoff frequency in passive filters
  • Research the role of load resistance in filter design
  • Examine practical examples of passive Butterworth filter implementations
USEFUL FOR

Electrical engineers, audio engineers, and students involved in filter design and analysis will benefit from this discussion.

Neutronium
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Hello,

I'm looking for a guide on the steps to design passive butterworth filters, specifically the steps on how to find the L and C passive elements using the butterworth polynomial, the cutoff frequency, and the terminating/load resistance. Is it necessary to use continued fractions? My 'textbook' is unclear and I can't seem to find any decent resource online.

Thanks
 
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You end up solving polynomials. Here's Butterworth's paper. It's pretty readable.

http://www.expertran.com/butter/paper.pdf
 
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