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AD9361 low frequency spurious

Category: Hardware
Product Number: AD9361
Software Version: no_os_software_2019_R1

Hello everyone!

i find there are some low frequency spurious on my AD9361's TX port,when i send a BIST on 2.4GHz , it looks like this:

disable the BIST , the output looks like this:

when i change the TX LO frequency and the BBPLL frequency ,the Low frequency spurious will have some change like this:

How can i solve this problem?