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Post subject: Gain Compression with behavioral
Posted: Wed Apr 14, 2010 1:25 pm
Joined: Tue Apr 13, 2010
I have a "problem" concerning gain
compression in top-level testbench considering overall
The TX budget is as below:
-- 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
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
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.