[SI-LIST] 8 layer stackup recommandation

Dear all, I have 2 questions
 

1) We are planning to use 8 layer PCB for high speed circuit having max 1.5GHz 
clock frequency. Which stackup do you recommend?

 

First Stackup:

 

Signal

Ground

Signal

Signal (includes a few power islands)

Power (includes ground island for 4th layers' high speed signals' return path)

Signal

Ground

Signal

 

OR

 

Second Stackup:

 

Signal

Ground

Signal

Ground

Power

Signal

Ground

Signal

 

 

Second choice seems good  but  very hard for routing, Do you think it worths to 
try second choice?

Which is the best stack up for 8  layer PCB for good Signal integrity and EMC 
performance? 

 

2)  Can we say that if any stackup is the best for Signal Integrtiy, it is also 
the best for EMC? or reverse?

 

Thanks for your interest

 

Regards

Mustafa

 


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