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Convert C/I3 to IP3 - 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: Convert C/I3 to IP3
Posted: Tue Aug 25, 2009 5:27 am 
 
Lieutenant

Joined: Tue Aug 25, 2009 5:20 am
Posts: 1
Have got some date but do not have the formula to convert C/I3 to IP3. I have the LNA gain(dB), input power level (dBm) and C/I3 (dBc). Could some one help me with the conversion? Thanks.


 
   
 
 Post subject: Re: Convert C/I3 to IP3
Posted: Wed Aug 26, 2009 12:35 pm 
 
Lieutenant
User avatar

Joined: Mon Aug 10, 2009 1:22 pm
Posts: 3
Location: Australia
I have never heard of a C/I3 equivalent of IP3, but there is a ratio of the carrier power to 3rd-order intermod product power.

http://www.maurymw.com/support/pdfs/5C-043.pdf

The IM3 power is governed by the standard equation:

P(IM3) = 3*P(input tones) - 2*IP3

That works for input or output reference.

So, knowing your carrier level, and the IM3 tone levels, simply subtract dB levels to get the ratio.

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