|Created||March 02, 2012|
|Last modified||March 09, 2012|
Three amplifier SV filter provides Highpass, Bandpass, and Lowpass outputs; a fourth amp is shown implementing a notch filter.
State Variable filter
Provides second order High pass, Lowpass, Bandpass.
OA4 here sums the LP, BP outputs to create a notch filter.
In typical design:
R3=R5; C1=C2, and the cutoff frequency is 1/(2piR3*C1)
Q = (R10+R9)/(3*R10) (Q is the magnitude of response at cutoff; higher Q give more peaking/resonance)
As shown, 1kHz and critical damping (Q=0.7)
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