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Digital
Library of the European Council for Modelling
and Simulation |
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Title: |
Design Of A Simple Bandpass Filter Of A Third Octave
Equalizer |
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Authors: |
Martin
Pospisilik |
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Published in:
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(2017).ECMS 2017 Proceedings
Edited by: Zita Zoltay Paprika, Péter Horák, Kata Váradi, Péter Tamás
Zwierczyk, Ágnes Vidovics-Dancs, János Péter Rádics European Council for Modeling and Simulation. doi:10.7148/2017 ISBN:
978-0-9932440-4-9/ ISBN:
978-0-9932440-5-6 (CD) 31st European Conference on Modelling and
Simulation, Budapest, Hungary, May 23rd
– May 26th, 2017 |
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Citation
format: |
Martin
Pospisilik (2017). Design Of A Simple Bandpass Filter Of A Third Octave
Equalizer, ECMS 2017 Proceedings Edited by: Zita Zoltay Paprika, Péter
Horák, Kata Váradi, Péter Tamás Zwierczyk, Ágnes Vidovics-Dancs, János
Péter Rádics European Council for Modeling and Simulation. doi: 10.7148/2017-0397 |
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DOI: |
https://doi.org/10.7148/2017-0397 |
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Abstract: |
As
they are spread across almost all applications based on electrical circuits,
frequency filters form one of the most complex issues on electronic devices.
There exist a great number of different design methods based on various
approaches. A large group of these filters is based on active components,
namely amplifiers, that are equipped with the
appropriate feedback to achieve the desired transfer function. In terms of
applications operating at audible frequencies it became to be a rule that one
or two operational amplifiers are applied, taking into consideration that
their input impedance and amplification factor are infinitely high, whilst
their output impedance is infinitely low. The simulation results presented in
this paper show that these considerations may not be
so strict. That means the input impedance may be in tens of kiloohms and the
amplification factor of 40 dB without the feedback loop can do enough.
Moreover, the operational amplifiers may be replaced by a
simple circuit consisting of two transistors, as it is shown in this
paper. This should be considered when calculating manufacturing costs of
several designs. In this paper, a detailed description of a band pass filter
for a third octave equalizer is presented. However, it is obvious, that the
same approach can be applied in other designs. |
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