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: LNA Design for satellite receiver
Posted: Sun May 15, 2005 3:05 pm
Joined: Sun May 15, 2005 2:46 pm
Can anyone tell me how it is possible to build a low noise amplifier with a gain of more than 50 dB and a noise figure less than 1 dB? Most LNB's of a satellite receiver have such good characteristics but most commercial IC's and MMIC's are far away from that.
Posted: Thu May 19, 2005 2:50 pm
The overall noise figure is dominated by the first stage in the design. You could cascade several amps and rig up a high gain low noise amp yourself. Only the first stage would have to be low noise, the rest don't have to.
Posted: Sat May 28, 2005 2:24 pm
what frequencies are we talking about?