Sallen Key Filters

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In 1955 R.P Sallen and E.L Key describe these filter circuits, and hence they are generally known as Sallen Key filters.

Low Pass Filter

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Calculation procedure, assign:

R1=m*R
R2=R
C1=C
C2=n*C





For these formulas, gain is equal to 1.


High Pass Filter

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Calculation procedure, assign:

R1=m*R
R2=R
C1=C
C2=n*C
Gain=1

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