Circuit of a Low-pass Filter Composed of Same Parameters with 24 dB Every Octave

Published:2011/7/15 0:58:00 Author:Joyce | Keyword: Low-pass, Filter, Same Parameters, 24 dB, Every Octave | From:SeekIC

As shown in the figure is the circuit of a low-pass filter composed of same parameters with 24 dB every octave. This circuit is a low-pass filters with 24 dB every octave, which is formed of filtering components of same parameters. In order to get the needed Q value, open-loop op-amp is set to be greater than 1,and at this time the input op-amp becomes 1/2.57 attenuator. The characteristics of the circuit is that when it constitutes multilevel filters, using resistance R of cut-off frequency fc and capacitance C would get the same constant. The parameters of the components in the circuit can be calculated according to the formula fc = 1 / (2 π RC) .The value of resistance ranges from several k Ω to a few hundred k Ω, and the value of capacitance is above several hundred pF.



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