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Re: [Help-gnucap] Stochastic current inputs

From: Chinasaur
Subject: Re: [Help-gnucap] Stochastic current inputs
Date: Thu, 29 Nov 2007 18:36:48 -0800 (PST)

a r-4 wrote:
> Hi,
> What you're probably looking for is a monte-carlo analysis. I don't
> know which free simulators implement it - you may have some luck with
> Spice Opus. Otherwise go for hspice, spectre or some other commercial
> tools.
> <snip />

Hi, yes thanks that sounds like exactly what I need.  I will check the
variants you suggest.  Off the top of your head (anybody) is there a variant
that allows Poisson distributed parameters?

Also would still appreciate insight into why my approach (described below)
led to diminishing speed on higher iterations.  Why would reassigning
.parameter values over and over lead to reduction in speed for subsequent
.op analyses?


Chinasaur wrote:
> <snip />
> I tried an implementation that at least avoids doing that.  I created a
> netlist describing the resistors and current sources, but using parameters
> to designate the current values.  Then I created a command file with
> .parameter commands for every current source followed by .op commands;
> this command file resets the current source parameters and runs the
> operating point over and over, up to 1000 times.  I thought this would be
> more efficient as it only loads the architecture of the resistive network
> once and then just overwrites the current source parameters each time. 
> But it seems there's some leak because the more times the parameters are
> reassigned, the slower everything runs.  Is this the behavior expected?

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