16 Dec
2011
16 Dec
'11
11:41 a.m.
Mouse wrote:
[...]
Ah! Okay. Thank you.
Hey Guys, maybe it's possible that you get an other headline for your
discussion?
Regards,
Holm
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>> IIRC
mo purely linear system can produce stable oscillations [...]
> On the one hand, that feels right.
> On the other, I'm considering an AGC
circuit that [...] uses a FET
> as a variable resistor, and trying to figure out where it's got
> anything nonlinear in it (assuming the amplifier is running class
> A).
I was using 'linear' in its mathemtical
sense.
So was I.
It is clear form this that any aplifier iwth any
form of AGC is not
linear.
Right. What's puzzling me is where the nonlinearity comes from in the
FET-based version. I'm probably just missing something. (Does a FET,
modeled as a voltage-controlled resistor, count as nonlinear, assuming
it stays in the region where the model is reasonably accurate and
linear? Seems linear to me, but perhaps I'm missing something there
too.)
I am sure we all know the stroy of Fred Terman and a
certain
research student.
Doesn't sound familiar to me, for what that may be worth.
The name of this student was William Hewlett.
The product was the
model 200A audio oscillator.
Hm, I have some very old (steel case with, I think, brown speckle
finish, all-valve construction, land-anchor weight) HP electronics.
I should check model numbers; I might even have a 200A.
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