The Designer's Guide Community
Forum
ForumVerilog-AMSAnalysisModelingDesignTheory
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Aug 15th, 2024, 9:17am
 
  HomeHelpSearchLoginRegisterPM to admin    
The Designer's Guide Community Forum › Design › RF Design › NFmin is very low. Is it normal?
‹ Previous topic | Next topic ›
Pages: 1 2 3 
Send Topic Print
NFmin is very low. Is it normal? (Read 20994 times)
aaron_do
Senior Fellow
******
Offline



Posts: 1398
Re: NFmin is very low. Is it normal?
Reply #30 - Feb 21st, 2014, 3:45pm  
if the output port is not connected, S12 is meaningless. What is S12 when the output port is connected?
Back to top
 
 
there is no energy in matter other than that received from the environment - Nikola Tesla
View Profile   IP Logged
baab
Senior Member
****
Offline



Posts: 178
EA
Re: NFmin is very low. Is it normal?
Reply #31 - Feb 21st, 2014, 6:33pm  
Hi, Aaron.

S11 = -36 dB as output port is connected. I think it is good. However, now S11 is about -6dB.  

I used cascode topology. Therefore, I think S12 is not problem now.
Could you check the method to choose Ls and Lg that I did here?
http://www.designers-guide.org/Forum/YaBB.pl?num=1392967942

Is it the right way for input impedance matching?
Back to top
 
 
View Profile   IP Logged
Pages: 1 2 3 
Send Topic Print
‹ Previous topic | Next topic ›
« Home ‹ Board
The Designer's Guide Community Forum » Powered by YaBB 2.2.2!
YaBB © 2000-2008. All Rights Reserved.
Copyright 2002-2024 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.