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Sallen and Key Filter 14.4
Unity Gain Sallen and Key Filter
SK Filter with Gain more than 1
Sensitivity of ω n
Sensitivity of Q
R2/R1=1, C2/C1=1, K=1 Q Q↑→Increased sensitivity to component variations
Q=2, C2/C1=1, R2/R1=1 K K↑→Increased sensitivity of Q to K increases
Q=2, C2/C1=1, K=2 R2/R
Q=2, R2/R1=1, K=2 C2/C
Summary SK filter shows more sensitivity to component variation as Q increases Low R2/R1 & C2/C1 leads to less sensitivy due to R1, R2, C1 and C2, but more sensitivity to K.
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