Sallen-Key High-Pass Filter Calculator

This calculator is used to determine the value of the resistors needed for a second-order unity-gain Sallen-Key High pass filter.

Input the selected values for the desired cutoff frequency and the capacitors. C1 and C2 will be equal. Hit the Calculate button for the resistor values.

Note that R2 is always double the value of R1.
The values are for a Butterworth response, which has maximally flat passband
frequency response. The output decreases at -12 dB per octave below the cutoff frequency.

Need to Convert Voltage Gain to Decibels?

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