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
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Low noise amplifier and Radiometer
Posted: Sun Jul 03, 2005 8:17 pm
Sorry if Im asking a silly question. I really new in this RF stuff. Currently i'm plan to design a basic radiometer receiver. The idea is just a horn antenna feed to detector and then to LNA before send to integrator. The detector that I will be using will give outpur from Dc to 1Ghz. My current problem is to obtain an LNA operate from Dc to 1Ghz with a very low noise figure ( if possible less than 1) which I still can't find it. My question is .. is it easy to design a LNA from Dc to 1Ghz with less than 1 NF?
If it durable ...I plan to use a PHEMT transistor but I only found PHEMT transistor operates from a few megaHetz to Ghz. None from Dc to Ghz. Is such PHEMt exist?