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S Parameter Test for Noise - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: S Parameter Test for Noise
Posted: Sat Nov 13, 2010 3:46 pm 
 
Captain
User avatar

Joined: Fri Jan 26, 2007 2:40 am
Posts: 23
Hello All!

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.

Thanks for any insight.

jom




Posted  11/12/2012
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