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Sallen and Key Filter

Sallen and Key Filter. 14.4. Unity Gain Sallen and Key Filter. SK Filter with Gain more than 1. R1=R2, C1=C2. Sensitivity of ω n. Sensitivity of Q. R2/R1=1, C2/C1=1, K=1. Q↑→Increased sensitivity to component variations. Q=2, C2/C1=1, R2/R1=1.

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Sallen and Key Filter

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  1. Sallen and Key Filter 14.4

  2. Unity Gain Sallen and Key Filter

  3. SK Filter with Gain more than 1

  4. R1=R2, C1=C2

  5. Sensitivity of ωn

  6. Sensitivity of Q

  7. R2/R1=1, C2/C1=1, K=1 Q↑→Increased sensitivity to component variations

  8. Q=2, C2/C1=1, R2/R1=1 K↑→Increased sensitivity of Q to K increases

  9. Q=2, C2/C1=1, K=2

  10. Q=2, R2/R1=1, K=2

  11. 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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