Joel Kolstad wrote:
Lots of good input there, Andy; I appaeciate it.

The part in question claims it is stable working into and from 50 ohms; I do
put too much emphasis on matching to that somewhat arbitrary value at times.

---Joel

Put its S-parameters into a two-port instantiation in RFSim99, Joel,
and you can play with matching and stability to your heart's content.
It won't help you directly with noise, but if the data sheet tells you
about how to match the input for lowest noise, that would be at least a
good starting point for the input network. I think you posted that
it's an MMIC; they often don't provide as good a set of info as do
"bare" transistor data sheets. NEC, for example, seem to do a good job
providing data about S-parameters versus frequency and operating
conditions, and about noise figure versus input matching as well.

Cheers,
Tom