sallon and key structures in filters

Discussion in 'General Electronics Chat' started by deadlyamplifier, Nov 25, 2009.

  1. deadlyamplifier

    Thread Starter New Member

    Oct 10, 2009
    can anybody tell me about sallon and key structures?please help me out.....
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    Have you tried Google? This is not meant to be rude but in this case your Google will be as good as mine. But feel free to post any questions related to material you find on Google
  3. Darren Holdstock

    Active Member

    Feb 10, 2009
    There are 3 main Sallen & Key architectures, as far as I can tell. You might not find the 3rd one on Google.

    1) Unity gain amp, where the passband has a gain of 1 because the output is tied to the inverting feedback input. 1 amp, 2 Rs, 2 Cs.

    2) Damping set by the feedback fraction. Here the gain is a function of the damping factor (gain < 3, IIRC). 1 amp, 4 Rs, 2 Cs.

    3) Resistive Gain Enhancement circuit. Here there can be arbitrary gain that is independent of the damping. 1 amp, 6 Rs, 2 Cs.

    There are sub-variants of these of course, nothing is ever simple.

    If you can find a Google link to #3 you deserve a prize.
  4. deadlyamplifier

    Thread Starter New Member

    Oct 10, 2009
    k i will check that the ways i have an interesting problem...its regarding synchronous counters.......ihave already posted a thread regarding that....please solve it.......i tried googling it but could not find an appropriate answer