That has nothing to do with circuit simulation. You were just joking, right ?
Rolf Molitor Ing.Buero i2e Remscheid / Germany -----Ursprüngliche Nachricht----- Von: "Georg Beckmann" <[EMAIL PROTECTED]> An: "'Protel EDA Forum'" <[EMAIL PROTECTED]> Gesendet: Samstag, 29. Juni 2002 14:25 Betreff: [PEDA] AW: SPICE sim question > Hi Gary, > > I want to use the simulator for a Monte carlo analyse for the following > question. > To simplify what I mean is, imagine a bridge circuit with four resistors of > 1% tolerance. > The circuit is usable, if the bridge - voltage is below a certain limit. How > many > percent of my circuits are usable so that I can decide what's cheaper, to > throw away > the bad samples or use of more expensive resistors. > > Do you know how this is done ? > When I looked at the examples, they only calculated the worst case of a > circuit, but > that's not the question, I want to get the distribution of a parameter. > > Georg > > > Afshin Salehi wrote: > > > > Just out of curiosity, what types of things do you guys run simulations > on? > > Amplifiers, linear and switching power supplies, filters, and just about > anything else that will need tweaking on the bench. > > > What drives you to run a simulation on that specific device? > > Testing for stability, what range of component values (tolerance) will > work reliably, gain, rolloff, keeping signal levels away from the rails > when designing high gain multi-stage amplifiers, and most important of > all, gaining rapid insight into what happens when you go outside the > box. Also, nothing catches fire or explodes in a simulator! > > >How accurate is the simulation to a real world bread boarded device? > > > Once you learn how to use simulation I would say about 98% accurate, but > there is a giant proviso here, you must have accurate models and you > must understand the limitations of the simulation process. I cannot > remember the last time a finished product did not behave as the > simulation did. The more often you simulate, the better you and your > results get. > > > Jon Elson said it takes a day at first then maybe an hour or so each time > to > > remember things, how is that justified to your boss? I am really just > > curious as to what things people run sims on, how complex those circuits > > that are simulated are, and if the tests are worth while? > > > I use an old but very capable DOS version ($15,000 when new) of PSPICE. > I can hand type an ASCII circuit description page in about a half-hour > (three or four op-amps and twenty or thirty passive parts). Another > twenty minutes to patch typos and missed connections. After the circuit > is running you can do a number of tests in minutes that would take a > week on the bench. Whether it is worth the trouble or not all depends > on what you're doing. The last thing I did was a strain gauge amplifier > (something I never did before). Had the circuit up and running in one > afternoon, cost of components about $10 versus a packaged product with > similar specs from Omega for $400. Is that worthwhile? My boss thought > so. > > It all depends... > Gary Packman > > > Thanks, > > > > Afshin > > > > ************************************************************************ > > * Tracking #: 089C581B73790B40A34A5F9530FFA0A756B58F96 > > * > > ************************************************************************ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
