Hi Kai,

Thanks for your efforts you are putting in explaining me.

And now think about, WHERELSE this current can flow between THESE TWO SEPARATE points located on digital ground plane. Of course, there's this one straight path right on the digital ground plane, where this current can flow and where this current is intended to flow. But you will find, that there's another path where this current, or at least a certain portion of this current can flow, namely from the left point (see above!) on DIGITAL ground plane to 0V terminal of +5V connector (the 'power connector' sitting on DIGITAL plane), through the interwinding capacitance to 0V terminal of +5V connector (the 'power connector' sitting on ANALOG plane), and via the connection path under your ADC back to the right point (see above!) on DIGITAL ground plane!

Ok so If I pick two points on my DGND plane a portion can flow through the path that I showed in my earlier post. Am I right? The current is flowing in between two arbitary points instead of one point I showed in my earlier post. I am correcting the picture and here is the modified one Am I correct this time?


And as you said the best thing that can avoid this Ground loop is placing the two supply connector close to each other and close to the star grounding point. This will certainly restrict the area of this loop to a very small one Am I right.

How about using two transformers? [ A Wild Idea may be I am wrong? ]

Thanks & Regards,
Prahlad Purohit