[SI-LIST] Re: Reverse Pulse Technique method?

  • From: istvan novak <Istvan.Novak@xxxxxxx>
  • To: venki.pras@xxxxxxxxx
  • Date: Sat, 18 Aug 2007 09:51:50 -0400

Hi Pras,

The authors of the paper may be out of town, so let me give you a quick 
summary until they chime in:

The Reverse Pulse Technique is based on the same powerful method that is 
used in high-speed passive channel simulations to get the worst-case eye 
in one pass, without simulating billions of bit transitions in the time 
domain.  The method makes use of the fact that the Impulse Response or 
the Step Response contains all information that you possibly ever need 
about the linear system.  You excite the PDN impedance with the 
specified fastest step current, record the step response, and process 
it.  The processing: you start backward (hence the name reverse) from 
the DC solution, and record sequentially the voltages and times of 
maxima and minima until you arrive to the time of excitation.  If you 
excite the actual PDN with alternating step-up and step-down current 
steps at the relative times when the step response showed the maxima and 
minima (in reverse order), you are guaranteed to get the worst case 
one-sided transient noise.  You dont even need to do the time-domain 
simulation with the worst-case excitation pattern: the transient part is 
the difference of the sum of maxima and sum of minima in the step 
response.  A further advantage of the method is that you can get the 
step response by simulating or measuring the impedance-versus-frequency 
curve and do the transformation into step response.

Hope this helps.

Istvan Novak
SUN Microsystems

Pras venki wrote:

>Hi all,
>I was reading this paper "*Aperisodic Resonant Excitation of Microprocessor
>Power Dictribution Systems and Reverse Pulse Technique*" by Victor Drabkin
>et al.
>i m trying to make sense of the "*Reverse Pulse Technique method*" thats
>been described. Can somebody explain it to me (if you have had access to the
>paper...i.e.), what exactly the author has tried to do...?
>Thanks in advance.

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