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Gain Compression with behavioral simulations - 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: Gain Compression with behavioral simulations
Posted: Wed Apr 14, 2010 1:25 pm 
 
Lieutenant

Joined: Tue Apr 13, 2010 4:00 pm
Posts: 1
Hello everyone,

I have a "problem" concerning gain compression in top-level testbench considering overall system.

The TX budget is as below:

RF side -- external rf diplexer -- external PA -- external RF filter -- rf amp -- 2nd mixer -- external if filter -- 1st mixer -- if amp -- external if diplexer -- IF side

all RF blocks has 50 ohms ref. impedance and IF blocks 75 ohms impedance.

I am using behavioral models in verilog-a in each block. I am having compression gain in 2nd mixer (specified in the model as 7 dB and simulated 4.5 dB) and rfamp (specified 10 dB and simulated 8.5 dB). Also, external PA had simulated gain 2 dB more than specified.

I am trying to understand why it is happening because apparently blocks linearity is ok to avoid gain compression.

I thank if anyone has an idea about this.





Posted  11/12/2012
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