[SI-LIST] Re: Terminating a branched clock line


Kevin,
You should place one source termination near the clock source, before the
branch.  The impedance of the trace from source up to branch point should
be 25 ohms.  The source termination should match the clock driver output to
25 ohms line.

Regards, Ravinder
PCB Development and Design Department
IBM Corporation
Email: ajmani@xxxxxxxxxx
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                      "kevinlfitzgerald                                         
                                                 
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                      <kevinlfitzgerald        cc:                              
                                                 
                      @yahoo.ca>               Subject:  [SI-LIST] Terminating 
a branched clock line                             
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                      04/12/2002 08:11                                          
                                                 
                      AM                                                        
                                                 
                      Please respond to                                         
                                                 
                      kevinlfitzgerald                                          
                                                 
                                                                                
                                                 
                                                                                
                                                 




Hi,

I have a clock signal with a 1ns rise time which is distributed to 2
parts.  The 50 Ohm lines are matched length within +/-50 thou after
the branch.  Our concern lies with the source termination. Should the
source termination be before the branch, or immediately after the
branch ?

Any thoughts,

Thanks,

Kevin

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