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Sallen-Key Butterworth Active Low Pass Filter Online Calculator

(Enter any one value - Resistor or Ca or Cb)

App Description

Sallen-Key Butterworth Low Pass Filter Calculator

Enter the value and click Calculate. The result will be displayed.

Ra = resistance in the filter

Rb = resistance in the filter

(Ra = Rb)

Ca = filter capacitor

Cb = filter capacitor

Sallen-Key filter is introduced by this circuit type

1955 MIT Lincoln Laboratory E. L. Key.

The circuit produces a very low pass response using two resistors, two capacitors and a unity gain buffer amplifier. The topology of such a filter is also referred to as a voltage controlled voltage source (VCVS) filter.

Sallen-Key filtering is a simple active filter based on the op amp stage, which is ideal for filtering audio frequencies.

This is one of the most widely used filter topologies. One of the reasons for its popularity is that this configuration has minimal dependence on the performance of the op amp's filter performance. Another advantage of this structure is that the ratio of the maximum resistance value to the minimum value of the capacitance value and the maximum value of the capacitance value is very low, which is a good processability.

A serious drawback is that it is not easy to tune the filter.

A low pass filter is a filter that attenuates a signal with a frequency higher than the cutoff frequency by a low frequency signal.

Usage example

Input data: cutoff frequency: 10KHz

Click "Calculate" to output the result

Resistance (Ra = Rb): 10.00000Kohm

Capacitor Ca: 2.25500nF

Capacitor Cb: 1.125000nF


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