[TCML] Current transformer with PLL-Overcoming the phase-shift problem

[vatercox@xxxxxxx]

Dear List,

Re: that fact that the current flowing in the secondary is 90 degrees out of phase with the voltage -which apparently can cause problems with a PLL controller when a current transformer is used to obtain the necessary positive feedback (although I'm not to sure whether or not this applies to a "quadrature" PLL) could this problem not be solved by using a four-phase output divider eg. a couple of 4013 cmos bistable ic wired as a ring or "Johnson" counter to derive rock-solid 90 degree phase shift irrespective of frequency?

Then, with the VCO operating at twice the resonant frequency,the primary could be fed from "0 degree" output of ring counter with the PLL reference input being provided by the "90 degree" output. This would provide a matching signal to the phase-shifted feedback from the current transformer.

What do you think?
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