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???
11/20/08 14:20
Modified:
  11/20/08 14:23
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Msg Score: +1
 +1 Informative		 #160154 - Wrong!
Responding to: ???'s previous message


Put the filter nearest to the connection of both ground planes! Best right at this connection!

By your methode you contaminate a large area of analog ground plane by the unavoidable digital ground return currents, which "survive" the filtering. Also, your design forms a too large loop area.

Use a pi-filter with each cap on each side of the connection between both ground planes, traversing the "gap" by the inductance (ferrtite) only.

Kai

List of 33 messages in thread
TopicAuthorDate
PCB routing question            01/01/70 00:00      
   once conneced inside ...            01/01/70 00:00      
   Maybe these links can help...            01/01/70 00:00      
      Is this ok            01/01/70 00:00      
         This is no PIC forum!            01/01/70 00:00      
            Not so            01/01/70 00:00      
               being in chat and the question having merit ...            01/01/70 00:00      
                  So you give me benefit of doubt :-)            01/01/70 00:00      
                     if two things are both beneficial ...            01/01/70 00:00      
                     I also recommend a 4-layer Board            01/01/70 00:00      
                        10-bit            01/01/70 00:00      
                           The rolling filters...            01/01/70 00:00      
                              changed            01/01/70 00:00      
                                 Wrong!            01/01/70 00:00      
                                    Consider this alternate            01/01/70 00:00      
                                       Exactly, that's what I meant!            01/01/70 00:00      
                                          Microchip people seems careless            01/01/70 00:00      
                                             Yes            01/01/70 00:00      
                                                To be on the safe side..            01/01/70 00:00      
                                                   Please compare and see...            01/01/70 00:00      
                                             Argh...not another chip here...            01/01/70 00:00      
                                                Oscillator pins as noise source            01/01/70 00:00      
                                                   Yes, the promises sound good...            01/01/70 00:00      
                                                      Differential mode advice            01/01/70 00:00      
                                                         I cannot see a differential mode            01/01/70 00:00      
                                                            Jpg format            01/01/70 00:00      
                                                               jpeg not so good for computer-generated images            01/01/70 00:00      
                                                            One point missed            01/01/70 00:00      
                                                               The SMPS should be enough of a reason            01/01/70 00:00      
                                    Great!            01/01/70 00:00      
                                       you have already lost the battle ...            01/01/70 00:00      
                                          Containing the damage            01/01/70 00:00      
                                             "hope springs eternal" ...            01/01/70 00:00      

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