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LNA Design for satellite receiver - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

-- Amateur Radio
-- Antennas
-- CAE, CAD, & Software
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 Post subject: LNA Design for satellite receiver
Posted: Sun May 15, 2005 3:05 pm 
 
Lieutenant

Joined: Sun May 15, 2005 2:46 pm
Posts: 1
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.


 
   
 
 Post subject:
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.


 
  
 
 Post subject:
Posted: Sat May 28, 2005 2:24 pm 
what frequencies are we talking about?




Posted  11/12/2012

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