sallon and key structures in filters

t06afre

Joined May 11, 2009
5,934
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
 
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.
 

Thread Starter

deadlyamplifier

Joined Oct 10, 2009
10
k i will check that out....by 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
 
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