sallen-key active butterworth low pass filter calculator
enter the value and click "calculate", the calculation result will be displayed.
sallen-key active butterworth low pass filter calculator
it was through this circuit type that the sallen-key filter was introduced
1955 el key, mit lincoln laboratory.
this circuit uses two resistors, two capacitors, and a unity-gain buffer amplifier to produce a very low-pass response. this filter topology is also called a voltage-controlled voltage source (vcvs) filter.
sallen-key filtering is a simple active filter based on an op amp stage that is ideal for filtering audio.
this is one of the most widely used filter topologies. one reason for its popularity is that this configuration has minimal dependence of the filter performance on the op amp performance. another advantage of this structure is that the ratio of the maximum and minimum resistance values to the maximum and minimum capacitance values is very low, resulting in good processability.
a serious drawback is that the filters are not easily adjustable.
a low-pass filter is a filter that passes low-frequency signals and attenuates signals with frequencies above the cutoff frequency.
usage example
input data: cutoff frequency: 10khz
click "calculate" to output the results
resistance (ra = rb): 10.00000kohm
capacitance ca: 2.250000nf
capacitance cb: 1.125000nf
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