[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.
>
>Regards,
>Pras
>
>
>
>
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