Question about Fmax (max oscillation frequency)

[Joe]

Hello, I have a quick question about the maximum oscillation
frequency.

I was reading earlier in a paper that the maximum oscillation
frequency of a transistor is defined as the frequency in which the
powergain is 0 (i.e. input power = output power).

I was just wondering why a transistor was considered oscillating if
it's output power is less than it's input power?

I've read many papers explaining the Rollett stability factor (K) and
the Available Power Gain (Ga) but nowhere have I found an explanation
of why I transistor is "considered" oscillating below fmax.

As well does anyone know of a decent paper or resources that can
explain this phenomenom to me?

Thanks in advance

 

[CWatters]

"Joe" <kbubbar@hotmail.com> wrote in message
news:2267d4c6.0402101619.51a5f4c3@posting.google.com...

Hello, I have a quick question about the maximum oscillation
frequency.

I was reading earlier in a paper that the maximum oscillation
frequency of a transistor is defined as the frequency in which the
powergain is 0 (i.e. input power = output power).

I was just wondering why a transistor was considered oscillating if
it's output power is less than it's input power?

That depends on your definition of oscillating. It's possible to drive it
from an external source at above fmax.