[time-nuts] Frequency of LC Tank.

Dan Kemppainen dan at irtelemetrics.com
Fri Apr 11 16:15:37 EDT 2014


Hi all,

I'm thinking about an upcoming project, if this is off topic please
disregard or contact me off list. :)

I have a large LC tank, with a very lossy inductor. Being driven by a
pulse width push pull driver, that is digitally controlled. The driver
circuit will couple through a N:1 transformer. I need to be able to
adjust the push/pull driver frequency to match the frequency of the tank
circuit. (See frequency/time is involved :) ) The tank components can
vary and are not adjustable, so the drive frequency needs to vary.

I'm thinking some sort of a phase detector may be the way to go. I'm
just not sure were to sample the V and I signals to look for phase
differences, or where to get a good clean reference from.

So the question is, when actively driving a tank circuit, how do you
know you are driving it with the same frequency ad the same phase it
naturally oscillates at.

Any thoughts, suggestions, or readily available papers you guy could
point me to?

Thanks!
Dan



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