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Sallen-Key High Pass Butterworth Filter Calculator

Sallen-Key Filter Stage

 

This calculator calculates the capacitor values for a unity gain Sallen-Key high pass Butterworth filter. The Sallen-Key filter is a simple active filter based on op-amps stages, which is ideal for filtering audio frequencies. 

For a derivation of the design equations see this link:  

High Pass Sallen-Key Design Equations

To use this calculator, select a resistance, the number of poles, and the cut-off frequency. 

3dB Frequency (Hz)
Capacitor (C1,C2=C) (uF)
Poles:

Quadradic: S^2+As+B.

Design equations:

R1= A/(4*C*PI*f)

R2= 1/(A*C*PI*f)

Derivation:

If normalized then Wo=1 and Q= 1/A.  (See the design equation page for R1 and R2)

 

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