I noticed when I set the TX LO and RX LO to the same frequency and keep both synthesizers on, the phase noise could be quite bad. Is this expected behavior? Is there anything I can try to improve the phase noise in this case?
Please refer https://ez.analog.com/thread/81127
In this configuration the PLL's are basically beating against one another creating this additional noise. The easiest thing to do is offset one and then shift back in software, essentially using a small IF.
Interesting idea! Do you have experiences in terms of how much of an offset is needed to largely avoid the performance penalty?
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