24dB/ octave Low-pass Filter Circuit Composed of the Same Parameters (μPC882)

Published:2011/8/10 9:54:00 Author:Felicity | Keyword: Same Parameters, Low-pass Filter | From:SeekIC

The circuit is 24dB/ octave low-pass filter composed of the filter components of the same parameters. To get the required Q, the open-loop gain of the operational amplifier should be above 1 and the input stage become a 1/2.57 attenuator. This circuit’s feature is the resistance R and capacitor C with decided cutoff frequency fc can reach the same parameters. The parameters of the circuit are determined by cutoff frequency, fc=1/(2πRC) ,and the resistance range is between several to several hundred kΩ and the capacity is above several hundred pF.



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