Quote of the day

"Simulations are doomed to succeed"

Reputed to have been coined by Dennis Bernstien at U MI. Good to throw at any beginning SPICE user (or any beginning user of any simulation software).

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www.wescottdesign.com
Reply to
Tim Wescott
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Has a downside though. Most of my recent projects saw zero bench time during the design phase. Nothing, zilch. Which is kind of sad and I miss that. When I get proto boards back for testing it usually all pans out as simulated so that phase is quite boring as well.

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Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

I think the quote is saying the exact opposite. Not all simulations are based on as solid an understanding of what they are simulating as spice.

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Rick
Reply to
rickman

Foundry models are generally now so good that a failure takes exemplary unexpertise >:-} ...Jim Thompson

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| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
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Reply to
Jim Thompson

It happens to all of us. Like yesterday, spooling up a trail on the mountain bike, hit the brakes hard when I came around a bend and saw that it was all flooded. Walked the bike up a hill to get around. Got to remember that for the return trip. The return was mostly downhill ... let's step on it ... yeehaw ... OH NO ... *SPLOSH*

Since I had another biker behind me to introduce him to mountain biking that was embarrasing. I should have remembered but didn't. Not s'posed to happen to experienced riders.

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Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

But you have to know what to simulate so that a successful simulation indicates a successful circuit.

Which, I contend, you do.

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Tim Wescott 
Wescott Design Services 
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Reply to
Tim Wescott

If only I could simulate the client in SPICE. It wouldn't be difficult with a random number generator driving periodic changes in specifications, telescoping deadlines, and unannounced budget limits. After modeling the client, we can work on simulating the component and PCB suppliers using a library of stock excuses, unstable specifications, surprise price changes, and delivery lies. While not really part of the design, having predicable models of the client and suppliers might produce a reasonable prediction of when and how much I'll be paid.

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Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
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Reply to
Jeff Liebermann

Normally yes for mos and bjt, however...

I have found at least one fab that was clueless about putting in Ft in its bjt model. They were duly informed that models without Ft were useless.

On occasions I have found that fabs don't understand what parasitics actually are for capacitors. A capacitor should not require back extraction with a tool to get the full parasitics.

Kevin Aylward

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- SuperSpice

Reply to
Kevin Aylward

You could revolutionize project management! Maybe even become famous...

Reply to
Bill Martin

And I'm sure the client wishes they could simulate *you*, as well!

"Hey, look! No need to pay that contractor anymore! Just type in what we are looking for, ..."

Reply to
Don Y

I wrote this during the late 1980's when I was first put in the awkward position of having to hire a programmist.

I am the client, the bills I do pay. I suffer the nerds. Who knows what they say? I buy all the software and hardware they need. In the name of progress, the server I feed.

But sometimes I wonder, where I would be at. No server, no disk drives, no expensive DAT. No spread sheets, no dbase, just games I shall play, for I am the client, the bills I do pay.

I've already been virtualized.

Most of the work I do is repair, damage control, project salvage, documentation decryption, butt kicking and finger pointing. I'm most commonly hired as an allegedly neutral party, who is immediately blamed for everything that went wrong immediately after my ceremonial firing. Usually, this is omitted in the project description, but one manager was good enough to mention that unsuccessful completion of the project requires that someone needs to be fired, which would probably be me. Rent-a-sacrificial-culprit is an important task which is not easily simulated by a computah.

[Q] What does dB stand for? [A] Dilbert.
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Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
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Reply to
Jeff Liebermann

I was talking to a manager at one of my customer's.

Me: "I'd sure hate to be the pacing item on this project."

Him: "You don't understand. Your job is to be the pacing item."

Reply to
John Larkin

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