A numerical design approach for single amplifier, Active-RC Butterworth filter of order 5

Hans Gaunholt

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Abstract

A design method is presented for the design of all pole lowpass active-RC filters applying operational amplifiers. The operational amplifier model used is the integrator model: omegat/s where omegat is the unity gain frequency. The design method is used for the design of a fifth order Butterworth filter applying just one operational amplifier coupled as a unity gain amplifier. It is shown that the influence from the real operational amplifier may be reduced by trimming just one resistor in the circuit. The unity gain amplifiers have the advantage of providing low power consumption, yielding a large dynamic range, sometimes simplifying the amplifier design and being usable over a larger frequency range than conventional constant gain amplifiers. The Schoeffler sensitivity index is used as a basis for a sensitivity comparison with other similar filters reported in the literature. © 2007 IEEE.
Original languageEnglish
JournalProceedings - IEEE International Symposium on Circuits and Systems
Pages (from-to)1927-1930
ISSN0271-4310
DOIs
Publication statusPublished - 2007
Event2007 IEEE International Symposium on Circuits and Systems -
Duration: 1 Jan 2007 → …

Conference

Conference2007 IEEE International Symposium on Circuits and Systems
Period01/01/2007 → …

Keywords

  • Operational amplifiers
  • Sensitivity analysis
  • Logic design
  • Electric filters
  • Numerical methods
  • Resistors

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