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Active Lowpass Filter Circuit with Attenuation of -18dB Ever

2017-02-25 00:41  
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Active Lowpass Filter Circuit with Attenuation of -18dB Every Octave
Active Lowpass Filter Circuit with Attenuation of -18dB Every Octave
As shown in the figure is an active low pass filter circuit with attenuation of -18dB every octave. The circuit is composed of a passive filter with attenuation of -6 dB every octave and an active filter with attenuation of -12 dB every octave. The whole circuit shows a low pass filter with attenuation of -18 every octave. R1 and C3 form the passive filter, and R2, R3, C1, C2 and operational amplifier constitute the active filter.