>> One approach that has been used is to use a 4:1 (or other
ratio, as
> suitable) transformer, with capacitive coupling between
primary and
> secondary (either parasitic, or explicit). The idea is
that as the frequency
> goes up, the capacitance tends to dominate over the
transformer. At low
> frequencies, the impedance of the capacitor is high enough
that it is
> irrelevant.
I'm missing something Jim.
How does the transformer decrease magnetic mutual coupling
effects from primary to secondary as it increases "bypass"
capacitance to effectively reduce turns ratio with
increasing frequency?
All I see happening is it making the system reactive while
the effective ratio barely changes if flux coupling is high.
73 Tom
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