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Jim Thompson · Aug 19, 2004

On 19 Aug 2004 05:40:20 -0700, michi@flyflaps.de (Michael Schuster)
wrote:

"Kevin Aylward" <salesEXTRACT@anasoft.co.uk> wrote in message news:<r8DUc.155454$28.137622@fe1.news.blueyonder.co.uk>...
Michael Schuster wrote:
Hello,
where can I find some infos about some limits of spice simulation? I
need it for a comparision of different simulators.

What do you mean by limits?
I mean e.g. the following:

I want to simulate behaviour of a resistor which characteristic (U:
Voltage, I current) is given by
I = f(U)
or
U = g(I)

Can I feed these characteristics directly into spice or would I have
to convert e.g. g(I) to its inverse function in order to model this
resistor with spice?

Or a component is given by:
I = d/dt(I) * d/dI(f(I))
or
U = d/dt(U) * d/dI(g(U))

Possible or not?
Thanks for your answers!
Michael

480)460-2350 | |
| E-mail Address at Website Fax

Kevin Aylward · Aug 19, 2004

Michael Schuster wrote:

"Kevin Aylward" <salesEXTRACT@anasoft.co.uk> wrote in message
news:<r8DUc.155454$28.137622@fe1.news.blueyonder.co.uk>...
Michael Schuster wrote:
Hello,
where can I find some infos about some limits of spice simulation? I
need it for a comparision of different simulators.

What do you mean by limits?
I mean e.g. the following:

I want to simulate behaviour of a resistor which characteristic (U:
Voltage, I current) is given by
I = f(U)
or
U = g(I)

Can I feed these characteristics directly into spice or would I have
to convert e.g. g(I) to its inverse function in order to model this
resistor with spice?

Yes. You can make a model using the B source, or a gm source.

Or a component is given by:
I = d/dt(I) * d/dI(f(I))
or
U = d/dt(U) * d/dI(g(U))

Possible or not?

Yes. Any standard spice will allow you to model this simply by using
capacitors/inductors in a little ".subckt". XSpice based ones (with is
just about all of them) will also allow a second method, that is by
using laplace S transforms. Look up the help in what ever spice you use
e.g. http://www.anasoft.co.uk/Spice3F5Manual.html

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

Jim Thompson · Aug 19, 2004

On 19 Aug 2004 13:43:59 -0700, engr4fun@yahoo.com (Engr4fun) wrote:

michi@flyflaps.de (Michael Schuster) wrote in message > I want to simulate behaviour of a resistor which characteristic (U:
Voltage, I current) is given by
I = f(U)
or
U = g(I)

Can I feed these characteristics directly into spice or would I have
to convert e.g. g(I) to its inverse function in order to model this
resistor with spice?

Or a component is given by:
I = d/dt(I) * d/dI(f(I))
or
U = d/dt(U) * d/dI(g(U))

Possible or not?

This would be simulator dependent. I know with Micro-Cap, you can put
in an equation directly into a resistor to define the resistance, and
I believe PSpice does the same although I'm not 100% sure on that.

Alex

480)460-2350 | |
| E-mail Address at Website Fax

Chaos Master · Aug 21, 2004

It was written by Tamim[tazizi@yahoo.com] in message
<3a4d075e.0408200715.3216573e@posting.google.com>:

Hi,
I want to buy Orcad. Since they are charging Ł4000 for a new copy
there is no way that i can afford that. Does anyone have Orcad 9 (or
hiher version such as 9.2 or 10) that they are not using. In ur reply
please indicate how much you would want for it.

Try eBay?

[]s
--
Chaos MasterŽ, posting from Brazil. REPLY TO GROUP!
MSN: wizard_of_yendor[@]hotmail[.]com http://marreka.no-ip.com
"People told me I can't dress like a fairy. I say,
I'm in a rock band and I can do what the hell I want!" -- Amy Lee

qrk · Aug 25, 2004

On 16 Aug 2004 04:57:55 -0700, tazizi@yahoo.com (Tamim) wrote:

HI every1,

Iam designig a PCB using orcad(9). At the moment i have two
boards(each is a two layer board). I have almost finished the design.
But i just realised that instead of having two seperate boards it will
be better to have one four layer board(or even 5 with a middle ground
layer). I spent quite alot of time in the routing of these two boards.
I dont want to redo everything. So is it possible to somehow combine
these two seperate files (two seperate boards) into one 5 layer
boards. Thank You.

Regards,
Tamim

Layout does not allow you to combine projects. If you work with your
board house, you might be able to work something out with the Gerber
plots if your boards only use surface mount components.

FYI, board houses like to deal with even number of layers like 2, 4,
6, ... Odd number of layers will cost you more. If your design only
needs 5 layers, duplicate the ground layer to make your project 6
layers.

If your only using two layers, I'm guessing that your design isn't
that complicated unless your making home entertainment equipment
(double sided with lots of jumpers and hundreds of components).
Starting over again shouldn't be that difficult, especially since you
have the previous layouts to guide you.

----
Mark

Dave VanHorn · Aug 25, 2004

Layout does not allow you to combine projects. If you work with your
board house, you might be able to work something out with the Gerber
plots if your boards only use surface mount components.

Indeed. The old dos versions have no problem with it, but the new improved
versions can't deal with it..
http://groups.yahoo.com/group/dos-orcad/

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR

Dave VanHorn · Aug 29, 2004

You might check on the dos-orcad group on yahoogroups.
A number of us have shelved the current windows versions, and gone back to
the old dos versions that actually work.

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR

Aug 31, 2004

I am designing a PCB using Orcad. I need a minimum clearance between the edge
of the board and the closest copper. Supposedly, if I set the width of the
board outline to the double of this value, I would have exactly my required
distance, but I don't (the minimum gap is bigger). Is it possible to adjust
exactly this distance?

Use a keepout plane around the edge of the board, set to all layers.

Mark

Roger Gt · Aug 31, 2004

<mountains@iname.com> wrote in message
news:4134ad2b$2$woehfu$mr2ice@giganews.aros.net...
:
: >I am designing a PCB using Orcad. I need a minimum clearance
between the edge
: >of the board and the closest copper. Supposedly, if I set the
width of the
: >board outline to the double of this value, I would have exactly
my required
: >distance, but I don't (the minimum gap is bigger). Is it
possible to adjust
: >exactly this distance?
:
: Use a keepout plane around the edge of the board, set to all
layers.
:
: Mark

The Grid must allow you to hit the value too. If you use a .02
grid, you can't get a .003 clearance.

Dave VanHorn · Aug 31, 2004

Make certain that your board house knows to route to the CENTER of that
line, and not either edge!
--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR

Sep 1, 2004

I think I'll finally create a free track at the due distance and, after
routing, I'll just delete it (idea taken from first post .

Cool. Give us some feedback tho

What version of OrCad are you using, and
doesn't it allow you to place a keepout layer? I am not that familiar with
all the latest itterations of OrCad.

Thanks,

Mark

.:: Evanescence ::. · Sep 2, 2004

John Swenson blinks:

Has anyone seen this, or seen it in action yet?

I hadn't seen this, but I'd wish to see some "in action" screenshots of
it.

--
..:: Evanescence ::. Porto Alegre, RS, Brazil
"My wounds cry for the grave, my soul cries for deliverance.
Will I be denied Christ, tourniquet. my suicide?"
-- Evanescence, "Tourniquet"

qrk · Sep 2, 2004

On 31 Aug 2004 09:32:38 -0700, Bishionario@hotmail.com (Joe) wrote:

Hi guys,

I am designing a PCB using Orcad. I need a minimum clearance between
the edge of the board and the closest copper. Supposedly, if I set the
width of the board outline to the double of this value, I would have
exactly my required distance, but I don't (the minimum gap is bigger).
Is it possible to adjust exactly this distance?

Thanks!

Half of the board outline width sets the clearance distance on any
plane layer. Your DRC will check for objects that are half the board
outline thickness plus the clearance distance set in your route
spacing spreadsheet. If your using copper pours near the edge of the
board, then you will need to consider what you are using for the
copper pour clearance.

Mark

Boris Mohar · Sep 3, 2004

On 2 Sep 2004 19:55:08 -0700, phoenixbb22@yahoo.com.cn (Newer) wrote:

After I DRCed my schematics without errors, I began to creat netlist
to allegro, but it always reported the following error info , so that
,i cann't get the netlist properly. I want to know the reason,please
help me . Thanks a lot

I don't use Allegro but your foot long part names might be a problem.

Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs http://www3.sympatico.ca/borism/

Sep 3, 2004

I'm creating my entreprise, and I'm looking for a Electronics CAD.

Between PROTEL, ORCAD, CADSTAR, which one could be the better
regarding facilities, and compatibilties whith Cadence, Orcad, Protel and
Cadstar?and also possibilities of functionnal extension?

I can't tell you everything you asked, or need to know, but I will step in and
say avoid Protel at all costs. Not a user friendly piece of software at all. I
was given a copy by a customer, and even free isn't enough to make me want to
waste my time using it.

Roger Gt · Sep 3, 2004

<nothing@nothing.com> wrote in message
news:41389b35$2$woehfu$mr2ice@giganews.aros.net...
:
: >I'm creating my entreprise, and I'm looking for a Electronics
CAD.
:
: >Between PROTEL, ORCAD, CADSTAR, which one could be the better
: >regarding facilities, and compatibilties whith Cadence, Orcad,
Protel and
: >Cadstar?and also possibilities of functionnal extension?
:
: I can't tell you everything you asked, or need to know, but I
will step in and
: say avoid Protel at all costs. Not a user friendly piece of
software at all. I
: was given a copy by a customer, and even free isn't enough to
make me want to
: waste my time using it.

I'm sure Bad advice is not what you wanted. All the packages you
list require learning to use them in an effective manner. Over the
years I've used many different Schematic capture and layout tools,
currently I use Orcad and Protel and find both adequate, although
the differences are sometimes annoying. If you want support, Buy
the PROTEL 2004, they are really great in the support group and
training is available. However I do not recommend any of them, as
a start up you should use a professional design house until you
know what your trying to accomplish!

Roger Gt

Roger Gt · Sep 3, 2004

<nothing@nothing.com> wrote in message
news:4138b654$1$woehfu$mr2ice@giganews.aros.net...
:
: Protel is not an easy package to use, and after a lot of
experience in using
: it, I would not recommend it to anyone. Consider that maybe they
have great
: support because the software is so badly implemented that it is
the only way
: they can get anyone to use it. I have used the products you
mentioned, in one
: version or another, and Protel falls way short in any about any
comparison.
: Its best to remember that some people take their software
packages very
: seriously and would probably let you say things about their wife
and kids,
: that they would not allow you to say about the favorite CAD
program. If you
: want to be productive, avoid Protel.
:
: I am pretty sure that no matter what I would recommend, or
comment against,
: some will say anything to stir the pot and create a fuss, so
take anything you
: read in a usenet group, including my words, with a big old grain
of salt.

Grain of salt was being applied, and you seem to object to another
view!
AND a TOP poster, bad form!

As a professional using Protel and Orcad I feel that such bad
mouthing of a product needs to get identified as BAD advice. I
find Protel no harder to use than any of the eleven such packages
I have used, and far better than some. So get used to people
disagreeing with you.

The man wanted serious advice, not personal bias!

BTW, after using ORCAD for about fifteen years it took less than a
week to switch to Protel 99SE and a few days to up grade. I have
Protel fro '98 on, and except for '98 they are all reasonably good
packages. I strongly suggest you get the demo and try it before
making a judgment for yourself.

Clarence · Sep 3, 2004

<nothing@nothing.com> wrote in message
news:41389b35$2$woehfu$mr2ice@giganews.aros.net...
:
: >I'm creating my entreprise, and I'm looking for a Electronics
CAD.
:
: >Between PROTEL, ORCAD, CADSTAR, which one could be the better
: >regarding facilities, and compatibilties whith Cadence, Orcad,
Protel and
: >Cadstar?and also possibilities of functionnal extension?
:

I would recommend you get a demo of each, then after using them,
decide what you like. Easier than relying on others opinions.

Adrian Hey · Sep 4, 2004

Leon Heller wrote:

Same here. I've been using Pulsonix since it first came out. I've tried
all the other packages but don't like any of them. Protel, for instance,
has lots more features, but I doubt if many people actually use them, and
it is consequently rather slow and cumbersome, as well as having lots of
bugs.

Just curious, but do you know how EasyPC and pulsonix compare? They seem
to be from the same outfit AFAICT, but there's a huge price difference.

What can you do with pulsonix that you can't do with EasyPC?

Thanks
--
Adrian Hey

Sep 4, 2004

Grain of salt was being applied, and you seem to object to another view!
AND a TOP poster, bad form!

As a professional using Protel and Orcad I feel that such bad
mouthing of a product needs to get identified as BAD advice. I
find Protel no harder to use than any of the eleven such packages I have
used, and far better than some. So get used to people disagreeing with you.
\

Your time is up little guy. Folks are getting to realize that you are not a
professional CAD designer, but are just a troll, posting simply to irritate
folks. It worked for a while, but now you are in more trash bins than all the
fast food cups in America. Step back, maybe find a new name to post your flame
bait under, because no one gives you the time of day. When your address and
phone number get posted, you might find that your time spent here will not
have been worth the jollies you give yourself by trying so hard to inflame
others.

Anyone can see that all I did was offer an opinion, and you jumped up and
down, screaming about bias and attitude. The top post is MY choice, and if you
want to play net cop, well, you are the one who has no real life of his own,
so rant on if you feel it will do any good. Little people like you only get
by because you are well hidden behind your keyboard. In real life, you would
be face down on the carpet, bleeding profusely. Enjoy being invisible for now,
as it may not last.

Protel is a very difficult package to use, compared to the other options
mentioned. If you don't agree, I don't care. Maybe get back into your
state-of-the-art AMC Pacer and drive on out of here..... Anyone who would
waste their life doing what you do, ought to consider ending it.

Filter is on, so whatever you say will not be read by anyone who cares.

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Jim Thompson

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Kevin Aylward

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Chaos Master

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.:: Evanescence ::.

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