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The Attenuation α - Sallen-Key Filter calculator computes the filter based on two resistance measurements and the the capacitance.
INSTRUCTIONS: Choose units and enter the following:
Attenuation Sallen-Key Filter (α): The calculator returns the filter value in hertz. However, this can be automatically converted to compatible units via the pull-down menu.
The formula for the alpha Sallen-Key Filter is:
α= (R1+R2)/(2⋅C1⋅R1⋅R2)
where:
This equation computes the attenuation factor of the unity gain low pass filter implementation of the Sallen-Key topology. This electronic filter is a special case of a second-order unity gain filter version of the voltage-controlled voltage-source (VCVS) topology.
The attenuation factor α is given as a function of the Resistances (R1,R2) and the Capacitance (C1) shown in the diagram.
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