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no noise figure analyzer how to measure a new LNA NF? - 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.


LELE FIR
 Post subject: no noise figure analyzer how to measure a new LNA NF?
Posted: Tue Aug 21, 2007 10:19 am 
 
Lieutenant

Joined: Tue Aug 21, 2007 9:43 am
Posts: 3
Location: shanghai
I have design a ATF-54143 LNA
but have no noise figure analyzer
just a HP8563E Spectrum and a signal generator and vector analyzer
so I can measure S21 and S12 S11 and P1dB

BUT I can not measure NF of LNA .
Spectrum have so more error when connect with generator.

HOW can I measure a NF of LNA without noise figure analyzer

thank you .


 
   
 
RFDave
 Post subject:
Posted: Tue Aug 21, 2007 9:50 pm 
 
Captain
User avatar

Joined: Sat Apr 22, 2006 11:14 pm
Posts: 20
You need a calibrated noise source to do a Y-Factor measurement. Agilent has a good app note at http://cp.literature.agilent.com/litweb ... -3706E.pdf

App Note 57-1 is also a good reference.

Dave


 
   
 
LELE FIR
 Post subject:
Posted: Wed Aug 22, 2007 8:37 am 
 
Lieutenant

Joined: Tue Aug 21, 2007 9:43 am
Posts: 3
Location: shanghai
THANK you

I known these 3 ways to measue NF .

1 use noise figure analyzer ,(I have not)

2 use spectrum to calculate NF.GAIN measurement ( our company's spectrum have so many errors)

3 use Y-Factor measurement (I have not noise source).

oh, no way


 
   
 
RFDave
 Post subject:
Posted: Thu Aug 23, 2007 9:54 pm 
 
Captain
User avatar

Joined: Sat Apr 22, 2006 11:14 pm
Posts: 20
The Noise figure meter simply automates the Y-factor measurement. You really need a noise source to do this. It's been a long time since I purchased a noise source, but google is your friend here. The Amateur radio community has build up noise sources from Noise diodes and Zener diodes, so you could probably DIY a noise source if you have to.

Dave
www.keystoneradio.com






Posted  11/12/2012

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