 Sallen-Key low-pass filter

ID: sallen-key-low-pass-filter

A second-order active low-pass architecture using a non-inverting amplifier and a resistor-capacitor network with output feedback into the network. For the convention with

R_{1}

from source to A,

R_{2}

from A to the non-inverting input,

C_{2}

from that input to ground and

C_{1}

from A to output,

a = C_{1} R_{1} (1 - K) + C_{2} (R_{1} + R_{2})

and

b = R_{1} R_{2} C_{1} C_{2}

. The poles, not merely finite values of

G (iω)

, determine whether a settled sinusoidal response exists.^[ref]

 New to topics? Read the docs here!