Paul Burridge wrote:

On 24 Jan 2005 19:38:20 -0800, wrote:


Ok, but let's say i wanna design a linear, class A PA, and
i need to know Zin and Zout, so i know what to
conjugately match too. I should be able to do this
with ADS using a *.s2p file, but i haven't figured
out how to do this yet! There should be a freeware
program out there...


Checkout RFSim99. That should do what you want. Type it into Google to
find it.
You can try Puff

http://www.its.caltech.edu/%7Emmic/p...uffE/puffE.htm

Its a brilliant DOS based S-parameter analysis program

How ever if you are Windows savvy perhaps Serenade v8.5 from Ansoft

Regards Andrew