[sdiy] CEM VCF transconductance stage difference!

[karl dalen]

>Magnus Danielson <magnus at rubidium.dyndns.org>
 
> You are correct. If all roots have the same real position,
> they will expand out from that in the shape of a circle. The
> sign of the feedback will control which orientation the
> poles will have on the circle. For a 4-pole design positive
> feedback gives poles at +/- 45 degrees and +/- 135 degrees
> while negative feedback gives poles at 0, +/- 90 degrees and
> 180 degrees. If the poles where not quite on mark (they
> never are), they will gather first and then expand out as
> expected but with a slightly skewed position and shape.

For wich filter does this apply? OTA, diode or Tr ladders?
I imagine a well balanced OTA spread their poles differently
then the diode and Tr?

Reg
KDiy


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