Steve,
I have seen this kind of behavior on marginally stable
MMIC amplifiers. The harmonic goes thru the roof
as it approaches the frequency range where the amp is
very unstable, but the amp will not take off and oscillate
on its own.
Mike, W4EF...........
>Circuits designed with poles on the Y axis will not intrinsically oscillate
>but will ring for long periods of time if excited at their resonance
>frequency. We use this type of circuit for high frequency (Gigahertz)
clock
>recovery and other related problems. It is very common for these circuits
>to be designed to ring at a harmonic of the excitation frequency. It works
>kind of like a poor man's phase locked loop.
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