Re: [ng-spice] Readline Response


To ng-spice@ieee.ing.uniroma1.it
From Paolo Nenzi <pnenzi@ieee.ing.uniroma1.it>
Date Thu, 19 Aug 1999 09:18:46 +0200 (CEST)
Delivered-To mailing list ng-spice@ieee.ing.uniroma1.it
In-Reply-To <199908182221.AAA01571@legs.ing.unibs.it >
Mailing-List contact ng-spice-help@ieee.ing.uniroma1.it; run by ezmlm
Reply-To ng-spice@ieee.ing.uniroma1.it



On Thu, 19 Aug 1999, Michele Quarantelli wrote:

> ABOUT JUNCTION DIODES:
> 
> Today's trend, especially in sub-micron technologies is to develop separate
> junction models from device MOS models and tha complete device is then
> described as a subcircuit. Check the Philips web site: they developed the
> JUNCAP model which can be used in conjuction with the MM9 MOS model.

I did not get the point: should we have a unified diode model (with many
paramters for deep submicron diodes) or different models ?

 
> ABOUT NG-SPICE:
> 
> I tried ng-spice and I was surprised I didn't find applied some patches from
> Mcquaire University (spectrum command via DFT, JFET level 2) which could be
> very useful. I think the package is included in some release available also
> at sunsite.
I was not aware of these patches, I am trying to search these patches, can
you give me an URL or an ftp site. I will download them and apply.


> Another observation is about the bsim3 implementation: It could be useful to
> add all the main bsim3 version in the simulator (for example via nested 
>levels
> e.g. level=8 -> bsim3.1 level=81 -> bsim3.2 etc ...) this is useful if you
> are stuck with extracted models from foundries (e.g. MOSIS provides bsim3.1
> models and using them with bsim3.2 gives wierd results).
This is the HSPICE implementation, in the future it will be implemented,
HSPICE is THE standard in this field.

> 
> Finally I would like to point out some features which as of today are of
> primary concern for an IC designer:
> 
> 1) Steady state analysis (Harmonic Balance, Shooting Newton, MPDE, etc ...)
> 2) good FFT implementation.
> 3) Two port parameter extraction.
Can you better explain 1).
2) What about the fft package available on the net in netlib ?
3) I am interesetd in this kind of analysis: I am planning to extract the
s-paramters of a two port network (they always exists) and then convert
them in the y,z,... paramters. this is the method used by smartspice and
seems good. Smartspice uses a circuit (automatically applied) to perform
this task. On my books I have find a theoretical circuit based on ideal
tranformers, not very useful. Still in search of good references.

Paolo



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