On Sun, 27 Mar 2005 20:55:46 -0500, "Leland C. Scott"
wrote in :

snip
I really don't think it's worth the effort since the PLL can track any
minor drifting that would require retuning of a state-variable filter.

I would think you could use the PLL directly by keeping the VCO frequency
range narrow. The loop filter doesn't have to be anything that complex,
state variable that is.


I tried the state variable filter as a stand-alone device, not as a
PLL filter. Although it might be interesting to see what happens when
it -is- used as a PLL filter -- probably get all kinds of FM and
intermod distortion......






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