Dear friends,
Hello! It is about 3 years from my last post and I'm glad to see that many of experienced posters are still active! The reason that I did not come for so long to this forum was because I almost completely switched to AVR and recently to ARM. While once in a few months I used to come and check posts of my favorite posters, I have introduced this site to many of my friends who still work with 8051 and almost all of them liked it! Certainly this site has changed a lot for good. I'm sorry to see that one of my most favorite posters "Mr. Michael Karas" from whom I learned really really a lot post much less than past; presumably because he is busy but I wish him the best. In past few weeks I was reading posts of yet another favorite poster of mine "Mr. Kai Klaas" about solid ground plane and its importance in routing. As frequency of MCUs increases these points are becoming more vital. Currently I'm experiencing with an ARM MCU @180MHZ. Well I learned a lot from Mr. Klaas posts and from links kindly provided by members of this forum that I like to thank them all.

My question is if a signal dose not return via ground then how should I route it to minimize current loop and reduce EMI. For example consider a very fast Opamp that is connected to another fast inverting Opamp. Then current from output of second OpAmp U2 will not return from ground it will return from either VCC or VEE to supply I usually use two decouple 100nF cap from VCC of U1 to VEE of U2 and from VEE of U1 to VCC of U2(not shown) but how should I route to minimize current loop.


Thank you
Best Regards,
Reza,