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. [...]
Any amplifierr with AGC, n matter how it's
designed, is non-linear.
Right. What's puzzling me is where the nonlinearity comes from in the
FET-based version.
I dont think it comes from any one component, but from how they're arranged.
Rather like the fact that a spring (ideally)( has a linear
force-extension chracteristc, but you ac anrrange it in a linkage which
adds positive feedback to make the quick make break action of a toggle
switch.
-tony