S Parameter Test for Noise - RF Cafe Forums
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Post subject: S Parameter Test for Noise
Posted: Sat Nov 13, 2010 3:46 pm
Joined: Fri Jan 26, 2007
I've been wondering what others
do when trying to design wideband (or even narrowband
I suppose) amplifiers in, say, the DC - 3 GHz range.
I've had some trouble with getting measured data
to match up with simulations.
We first used
data from either the manufacturer or even some companies
who do S Params for you (at a big cost). Lacking
success there we were able to probe test a number
of components (passive and a few pHEMT fets) but
we've encountered a few problems. One thing that
seems to be a problem is Noise. This is an expensive
proposition (source-pull) so I'm wondering what
other companies do to reasonably predict what they
might get for Noise Figure when most manufacturers
don't offer Gamma Opt and Rn etc. AND getting your
own Source Pull set it is a big cost.
for any insight.
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