[time-nuts] Frequency of LC Tank.
shalimr9 at gmail.com
Sat Apr 12 13:12:28 UTC 2014
Keep in mind that anything you connect across your tank circuit will affect its resonant frequency and Q (signal source and measuring device). You need to make sure your equipment is very loosely coupled to the UUT through small value capacitors for instance.
On April 11, 2014 3:15:37 PM CDT, Dan Kemppainen <dan at irtelemetrics.com> wrote:
>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
>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?
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