The effect of output choke and rectifier position in EMI

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choke for rectifier

hi to all!

can anyone tell me why there are some designs that place the output choke on the ground side and not on the positive rail?

one more thing is the output rectifier is also placed at the ground side and not on the positive side?

i've heard that it improves the EMI performance of the circuit but i cannot find any technical write-up that prove this...

any ideas?
 

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