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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 10.51.51 2 3.52 54.59.55 109.519.510 Q↑→Increased sensitivity to component variations
Q=2, C2/C1=1, R2/R1=1 K 11.53.52 21.53.54 41.53.58 K↑→Increased sensitivity of Q to K increases
Q=2, C2/C1=1, K=2 R2/R1 0.50.91423.74265.6569 11.53.54 1.51.953.583.262 2.02.323.842.8284
Q=2, R2/R1=1, K=2 C2/C1 0.50.81422.325.6569 11.53.54 1.51.94954.393.26 2.02.32845.15692.8284
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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