5 Replies Latest reply on Jan 31, 2017 6:55 AM by Carlos_A

    Effect of PCB Copper Thickness on Total Loss

    fekri Community Member

      In an Intel loss excel file for XL710, I realized that as copper thickness is decreased, the loss is increased, but in some other documents and using Algebraic Model program, this is the opposite. So as copper thickness is decreased, the loss is also decreased. Could you please explain, which one is correct?

      thanks.

        • Re: Effect of PCB Copper Thickness on Total Loss
          Carlos_A Brown Belt

          Hello, fekri:

           

          Thank you for contacting Intel Embedded Community.

           

          In order to help you, could you please give us all the information and details related to the "Intel excel file for XL710" and "other documents" that you have mentioned on your previous message?

           

          Please give us all the information that may answer this question.

           

          Thanks in advance for your cooperation.

           

          Best regards,

          Carlos_A.

            • Re: Effect of PCB Copper Thickness on Total Loss
              fekri Community Member

              Hi Carlos,

              Thanks for the reply. The excel file for XL710 is as below:

              Dropbox - XL710_Stripline_Differential_Trace_Calculator_for_10Gbps_and_40Gbps_IO_Modes_rev1p0.xlsx

              One of the other documents from which I have extracted some of my calculations is also shown below:

              Dropbox - kochuparambil_01_1211.pdf

              Based on XL710 document, the total loss decrease as CU thickness increase.

              Based on the other document, the total loss decrease as CU thickness decrease. In this one, may be I am missing some factors in my calculations.

              If you could feedback on the differences, that would be great.

               

              Thanks a lot,

              Niloofar

                • Re: Effect of PCB Copper Thickness on Total Loss
                  Carlos_A Brown Belt

                  Hello, fekri:

                   

                  Thanks for your update.

                   

                  However, in order to better understand this situation, could you please tell us specifically the sections and pages of the listed documents where the cited discrepancy can be found?

                   

                  Thanks again for your cooperation.

                   

                  Best regards,

                  Carlos_A.

                    • Re: Effect of PCB Copper Thickness on Total Loss
                      fekri Community Member

                      Hi Carlos,

                      For the XL710 document, please look at tab "Stripline routing__Main_page." When I increase 't' on that page, the total loss decrease.

                      For the other document, there are series of equations in which "t" is used either directly or indirectly (pages 9 and 11). Using those and varying "t", the total loss is increased as "t" is increased, so there is not inverse relation.

                      Do you have any idea why in each case it is different?

                       

                      Thanks a lot,

                      Niloofar

                        • Re: Effect of PCB Copper Thickness on Total Loss
                          Carlos_A Brown Belt

                          Hello, fekri:

                           

                          Thanks for your reply.

                           

                          It is important to let you know that the trace calculator provides a starting point for designs as is clarified in the disclaimer on the instructions page.

                           

                          By the way, the Stripline Trace Calculator developed by Intel produces the expected outcome, that being a decrease in loss when “t” (defined as thickness or height of the trace) in increased. Reviewing the third party document although the base impedance equation appears to behave like Intel’s document model, we suggest you request an explanation to the developer of this document to find the reasons

                           

                          Also, reviewing the third party document although the base impedance equation appears to behave like Intel’s document model, we suggest you request an explanation to the developer of this document to find the reasons of the result discrepancies.

                           

                          Finally, while generally trace thickness increases result in loss decreases, understanding the detailed changes requires the use of a more robust field solver.

                           

                          We hope that this information may help you.

                           

                          Best regards,

                          Carlos_A.