Thank you for visiting RF Cafe!

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeView the YouTube RF Cafe Intro VideoKirt Blattenberger
BSEE
KB3UON
EIEIO

Carpe Diem!
(Seize the Day!)

5th MOB:
My USAF radar shop

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding website

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
RF & EE Symbols Word
RF Stencils for Visio

no noise figure analyzer how to measure a new LNA NF? - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Please visit the new and improved RF Cafe Forums that were created in September of 2015. Unlike with the old forums where users registered individually, the new forums use a common User Name and Password so anyone can post without needing to create an account. Please find the current User Name and Password on the RF Cafe homepage. Thanks for your participation.

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

-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews
-- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

 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 .


 
   
 
 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


 
   
 
 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


 
   
 
 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
Copyright 1996 - 2016
Webmaster:  Kirt Blattenberger, BSEE - KB3UON

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.