Sallen-Key Butterworth Active Low Pass Filter Online Calculator
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