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Multiple-Feedback Low-Pass Filter

Design from specification

Pick an approximation and a cutoff; the R and C values are computed and rounded to the chosen E-series, then analysed below.

C1 and C2 are optional; when set, keep C1/C2 ≥ 4Q²(1+|K|) so R1, R2, R3 stay real.

Components (analyse / override)

Results

Components: R1 =   R2 =   R3 =   C1 =   C2 =

Cutoff f0 = Hz   Q =   ζ =   DC gain =

Transfer function:
H(s) =

Equivalent block diagram

Poles

Phase margin

Oscillation (ringing) frequency

Overshoot of the step response

Final value of the step response