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Looking for a formula for intermodulation - 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.


 Post subject: Looking for a formula for intermodulation
Posted: Tue May 31, 2005 5:23 pm 
Hi,
I'm looking for math and formulas behind calculating intermodulation products. I know the fundamentals; a+b+c+d, a+b+c-d, etc.
What I'm trying to find are formulas which can be used to take n=number of frequencies, o=order, and calculate all the intermod. products that fall within a given range.
Any pointers to this information would be greatly appreciated.
Thank you.
I can be reached at geofgibson@cox.net


 
  
 
 Post subject:
Posted: Wed Jun 01, 2005 8:41 pm 
 
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Joined: Sun Aug 03, 2003 2:02 pm
Posts: 653
Location: Erie, PA
Greetings Geof:

I believe this paper, by Chris Arnott (whom I worked with at one time), is what you are looking for.

"A General Algorithm to Calculate Third Order Intermodulation Product Locations for any Number of Tones"

http://www.cedmagazine.com/ced/2001/0201/webx/x02.htm

It can also be found as a link on RF Cafe on the App Notes page (1) and on the Electrical Formulas & Reference page (2).

(1) http://www.rfcafe.com/references/app-notes.htm
(2) http://www.rfcafe.com/references/electrical.htm


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