Low-Pass Fliege Filter Circuit Schematic DiagramThe Fliege Filter is kind of an active filter circuit configurations that has two-op-amp topology. It is available in low pass, high pass, bandpass, and notch versions. The following schematic and shows the Low-Pass Fliege Filter. This design has a good control over the tuning and the Q and style of filter. The gain is fixed at two for low-pass, high-pass, and band-pass filters, and unity for notch. Here is the detail:

R2 = R3 = R
C1 = C2 = C
R4 = R5, not critical
Fo = 1/(2pRC)

Gain fixed at 2
R1 = R/√2 Butterworth
R1 > R/√2 Chebyshev
R1 < R/√2 Bessel

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