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Location of Common mode choke for good EMC performance

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newbie_hs

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Hi Team


I am interfacing a deserializer with Quectels smart module.
The CSI lines of the deserializer are connected to the CSI lines of smart module.
A common mode choke is placed in between them. The schematic given below.
enter image description here
My question is in the layout where we need to place the common mode choke, that is
near to deserializer or near to smart module and why?
 

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