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| Created | March 02, 2012 |
| Last modified | March 09, 2012 |
| Tags | active-filter |
This 4 amplifier variant on SV filter allows all amps to be inverting. Provides Lowpass, Highpass and both inverted and non-inverted Bandpass outputs.
State Variable filter
Provides second order High pass, Lowpass, Bandpass.
In typical design:
R3=R5; C1=C2, and the cutoff frequency is 1/(2piR3*C1)
R1=R2=R6
Q = R9/R1 (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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