Sallen-Key low pass filter calculator¶

The Sallen-Key Low Pass Filter topology is one of the most popular configurations for active filters because it is easy to design, uses a single operational amplifier and does not need a very high performance amplifier. Using the calculator below, the component values can be calculated and tuned in a SPICE program (e.g., Spectre, LTSPICE).

Passband Gain

Capacitance (C):

Cutoff Frequency:

Q factor (dimensionless)

Output amplitude (V_pp)

C1

—

C2

—

R1

—

R2

—

R3

—

Rf

—

Rg

—

Theory:

Theory of Sallen-Key Filter

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