[ibis-macro] Re: AMI_Flows_6.pdf for today's ATM teleconference

  • From: ckumar <ckumar@xxxxxxxxxxx>
  • To: <Arpad_Muranyi@xxxxxxxxxx>
  • Date: Thu, 22 Apr 2010 03:43:21 -0700

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1. Now I am confused . I thought the whole flow complication was due to
models having both getwave returning modified wave and init returning a
modified impulse

Anyway I presume Fangyi's point was that there are cases where you can
have an approximation of the system with a modified (impulse) response. But
such modification is not mathematically equivalent to the convolution of 
an impulse response with a filter 

2. I do not agree. I find it hard to treat a dll as a file having multiple
models. The same way, I  do not expect to get two different results with
the same ibis model

 
On Wed, 21 Apr 2010 21:19:13 -0700, "Muranyi, Arpad"
<Arpad_Muranyi@xxxxxxxxxx> wrote:
> Kumar,
> 
> I don't understand why it matters whether the modification is
> done by convolution or a different algorithm inside the Init
> function as long as it is an LTI function.  (If this weren't
> an LTI function, it would have to be in the GetWave function
> anyway).  To me it seems that this would only matter if the
> Init function doesn't do it (Init_Returns_Impulse = False),
> expecting the EDA tool to do it instead which may only be able
> to do a convolution.  Could you please explain to me how this
> applies to this discussion?
> 
> On the second point, "The larger more issue still stands. i.e.
> the potential of getting two different results for the same model",
> I think you worded it incorrectly.  We are talking about two
> different MODELS in one FILE.  (One model being the LTI "approximation
> model" or Stateye model as others called it, and the other being
> the non-LTI "accurate model" or the TD model as others called it).
> As such, I would not expect the two MODELS (which happen to be
> delivered in one executable FILE to give me the same results...
> We have numerous examples for this being done in our life.
> 
> In IBIS we have [Ramp] together with V-t tables inside the same
> [Model] keyword (making two different models), in CAD tools
> there is this concept of "top-down" design methodology (with
> multiple views, i.e. models containing different levels of modeling
> details and/or algorithms for the same device and/or project),
> in VHDL-AMS we have multiple "architectures" for the same
> "entity", etc...  I would never expect these variants to give
> the same results, even if they happen to be in the same file...
> 
> Arpad
> =====================================================================
> 
>  
> 
> -----Original Message-----
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> Sent: Wednesday, April 21, 2010 10:50 PM
> To: Muranyi, Arpad
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> Subject: [ibis-macro] Re: AMI_Flows_6.pdf for today's ATM teleconference
> 
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> 
> I believe Fangyi is pointing out cases where modified (impulse) response
> exists, However it is not the result of convolution with a filter
> 
> The larger more issue still stands. i.e  the potential of getting two
> different results for the same model
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