[SI-LIST] Re: PDS analysis?

Hi,
 

I'd like to thank everyone who replied so far, off and on the list. I emphasize 
that this is a rhetorical question, it doesn't represent any specific product. 
I also emphasize that I'm interested more in the "real world observation" part. 
Instead of answers like "your power plane may have a resonance at xxx 
frequency", I'm more interested in answers like "you might see a waveform of 
xxx characteristics across the bypass capacitor". Also, this question is more 
about power distribution than signal return path. All answers appreciated.

 

-Ivor

 

________________________________

From: Bowden, Ivor 
Sent: Friday, March 28, 2008 7:24 AM
To: si-list@xxxxxxxxxxxxx
Subject: PDS analysis?

 

Hi SI Experts,

 

Say you have a typical PCB with modern technology mix of CPU, DSP, DDR, GIGE, 
PCIE, etc. Say it is a multi-layer stackup in the form of GND-SIG-SIG-GND sets, 
with the power distribution centered in the stackup as solid ground plane - 
split power plane - split power plane - solid ground plane, using 1oz copper 
and 3.5 mil dielectric. Assuming the split power planes utilize sufficient area 
to keep the point to point inductance and resistance to reasonable values, and 
0.1uF ceramic bypass caps are evenly placed at device pins, and bulk 
capacitance is placed as needed, would there be reason to expect any problems, 
such as plane resonance, etc? If so, what would be the observable real world 
manifestations, in terms of circuit performance and power pins scope waveforms? 
Would there be significant advantage to analyzing this PDS, or should following 
this "industry standard practice" for PCB PDS be sufficient to expect robust 
behavior?

 

Thanks,

 

Ivor Bowden

Senior Hardware Engineer

Curtiss-Wright Controls Embedded Computing

10201 Wateridge Circle

Suite 300

San Diego, CA 92121

858-452-0020 x 4405

ibowden@xxxxxxxxxxxxxxxxx

 


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