Re: [PEDA] AW: SPICE sim question

2002-07-02 Thread Gary Packman
Rolf, I am not sure of what part of my post you thought was a joke, it was a rather lengthy reply, but I assure you I was not joking about anything. Simulation has to do with the design of robust, reliable, stable circuits at the lowest possible cost. It is not just an RD toy. Anyone who

Re: [PEDA] AW: SPICE sim question

2002-07-02 Thread Gary Packman
Georg, I'm not sure I understand your question. What I think you are asking is how to predict the ratio of resistors that will make your bridge stay within certain design parameters versus those that will not based upon a random sample batch of parts. If this is what you're asking my advice is

Re: [PEDA] AW: SPICE sim question

2002-07-02 Thread Andy Gulliver
Also, in practice you'll be very lucky to find a resistor sold as 5% that is within 1% across temperature etc. - they're the ones that are being sold as 1% parts! Regards, Andy Gulliver -Original Message- From: Gary Packman [mailto:[EMAIL PROTECTED]] Sent: 02 July 2002 10:08 To:

Re: [PEDA] SPICE sim question

2002-07-02 Thread Gary Packman
Mira, The few good designers I have know in my 25 years of design *always* simulate their designs. Engineers who cannot design a functioning product without a simulator shouldn't be engineers in the first place. However, every engineer that takes simulation seriously can *improve* any design

Re: [PEDA] AW: SPICE sim question

2002-07-02 Thread Rolf Molitor
Gary, i did not reply to your post but to Georgs least cost calculator. I myself use simulation tools for several years and would grade them essential. The protel simulation tool should be improved in its user interface (displaying and documentation of the simulation results ...) primarily. No

[PEDA] Simulation model for Topswitchs

2002-07-02 Thread dave . white
Hi, Does anybody know of/have simulation models for Power Integration's Topswitch (TOP246 specifically) for Protel 99SE? I'm designing a battery charger using one of these and would be interested in evaluating my control loop with something approaching the actual switching device. Cheers Dave

Re: [PEDA] SPICE sim question

2002-07-02 Thread mariusrf
That probably was exactly her point. While good engineers simulate _critical_ portions of their designs (should such portions exist in that particular design) , there's no need to simulate the whole schematic. Moreover, you stated that with experience you learn to recognize which portions merit

Re: [PEDA] SPICE sim question

2002-07-02 Thread rlamoreaux
I use simulation for a couple of reasons. Last year I was given and existing design that didn't work. i found a few problems like op amps going into saturation and taking way too long to recover. In order to develop a fix I used simulation to determine if the voltage limiter would effect the

Re: [PEDA] Simulation model for Topswitchs

2002-07-02 Thread Bagotronix Tech Support
Dave: I just recently did a design using the TOP245. I don't think they have simulation models, but they do have a free program called PI-Expert you can run your TOPswitch design on. I think it's a canned SPICE simulation. It didn't work for me because I used an exotic topology that wasn't

Re: [PEDA] SPICE sim question

2002-07-02 Thread Bagotronix Tech Support
I would do more simulation if there were more and better models for the chips I want to use. Also, if the simulator software was easier to use (not talking about just Protel here). A lot of the designs I work on are mixed-signal, not strictly analog or digital. It's not easy to simulate these

Re: [PEDA] AW: SPICE sim question

2002-07-02 Thread mariusrf
no, or not always, or not anymore ;) -first of all, the 1% and 5% being tolerances , are usually specified either at standard temperature (like 25deg C) , or across temperature range. IF the specs are at 25deg C , they don't imply any kind of temperature performance . There will be no

Re: [PEDA] SPICE sim question

2002-07-02 Thread Mira
Gary, I agree with all you said here. I've seen a lot, believe me. I know and I'm working on projects that work well and are not simulated at all. I've seen also devices that were built on simulated circuits and didn't perform well. I've seen also a satellite receiver built in Bulgaria 15 years

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread Bagotronix Tech Support
I agree with AJ about the merits of twin-CPU machines. I routinely do other tasks while running something lengthy in Protel (such as DRC). During DRC (or printing in Acrobat, etc.), if you bring up the CPU resource monitor in W2K, you can see one CPU is running at near 100%, while the other is

Re: [PEDA] SPICE sim question

2002-07-02 Thread mariusrf
I still have memories of some analog switching done with bipolars , only using reverse saturation (collector reversed with emmitter - picture a npn with the emmitter tied at a more positive potential than the collector) . The trick was yielding lower Uce in saturation. Lots of people were quick

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread mike ingle
Ok, So it seems that the consensus here is that twin CPU machines are desireable. I am in a quandry because the goal here truly is to maximize productivity. So, what influences my productivity? Right now I am in a max plus II design cycle where I am waiting on compiles for up to 10 min.

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread Tony Karavidas
I think it's a conspiracy between MS and Int*l! ;) (Ok not really) A while back, I remember Intel coming to us (where I worked at the time) and asking for some big CPU intensive application to 'demonstrate' their newest Pentium de jour. I think what they really meant was: Do you have some

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread Tony Karavidas
Has anyone really noticed much of a difference with the newer and newer memory bandwidths and architectures? I was thinking about this for a moment and it occurred to me that if a given CPU has a 90+ % level 2 cache hit success, that means 10% of the time there is a cache miss and the system is

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread Brian Guralnick
Oh, and one more time: does anyone know of an altera listserver? I can't get newsgroups until I wring out some stuff w/ my ISP (pacbell dsl). Nope. But if your questions are Verilog, or, VHDL related, try these 2 news groups. There are a number of Altera users on both sites. I found them

[PEDA] The Protel-Users lists

2002-07-02 Thread Abd ulRahman Lomax
As some of you know, I'm travelling this month to China; e-mail access may be difficult for me, besides, I'll be occupied with www.texturatrading.com/lucia.html David Gulley [EMAIL PROTECTED] has moderator privileges on *all* the Protel-users lists on yahoogroups.com (*not* this list on

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread Matt Pobursky
On Tue, 2 Jul 2002 15:29:02 -0400, Brian Guralnick wrote: (I have yet to receive junk mail after signing up at google groups, unlike yahoo, which overflowed my email box with hundreds of adds.) I'm in about a dozen Yahoo! groups for the past couple years. I haven't got a single piece of SPAM

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread Matt Pobursky
Tony, I moved from a Abit KT7/Athlon 1.2GHz/512MB PC133/ATA66 system to a Soyo Dragon+/Athlon XP 1.4Ghz/1GB PC2100 DDR/ATA100 system this past December. The newer system is definitely much snappier across the board. I don't autoroute PCB's, but I do some CPLD design work with Cypress' Warp VHDL

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread Frank Gilley
At 11:08 AM 7/2/2002 -0700, Tony Karavidas wrote: I was thinking about this for a moment and it occurred to me that if a given CPU has a 90+ % level 2 cache hit success, that means 10% of the time there is a cache miss and the system is forced to go out to the main memory for a piece of

Re: [PEDA] SPICE sim question

2002-07-02 Thread Don Ingram
I would do more simulation if there were more and better models for the chips I want to use. Also, if the simulator software was easier to use (not talking about just Protel here). Or at least well documented ( even just adequately documented ;-) Anybody know of a good reference book which

[PEDA] Importing .dfx files into Protel

2002-07-02 Thread Mike Leachman
All, I am trying to import a file supplied by an IC supplier that contains library of schematic and footprint date. the type is .dfx, protel pukes when I try to open it. Any thoughts? mike * Tracking #:

Re: [PEDA] SPICE sim question

2002-07-02 Thread Mira
One more detail on this. If the problem is not with an error in the schematic, it crashes when different simulated parts of the schematic are merged. Most designers neglet the interconnections, which might cause significant loss of signal or changes of the characteristics of the load. Of course

Re: [PEDA] SPICE sim question

2002-07-02 Thread Fred A Rupinski
I regularly use SPICE and other Simulation Software (SystemView, MathCad, CC Studio, Vissim, FEMM, etc). Moreover, I've worked with a lot of scientists and first-class engineers who also take advantage of these tools. Therefore, the comments in this thread which admonish against the use of SPICE

Re: [PEDA] SPICE sim question

2002-07-02 Thread Ian Wilson
On 12:02 PM 2/07/2002 -0400, mariusrf said: I still have memories of some analog switching done with bipolars , only using reverse saturation (collector reversed with emmitter - picture a npn with the emmitter tied at a more positive potential than the collector) . The trick was yielding lower

Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual CPU

2002-07-02 Thread Ian Wilson
On 10:27 AM 2/07/2002 -0400, Andrew Jenkins said: Studies have shown time and time again that a pair of XMhz processors will out-perform a single 1.5X processor in most real-world tasking environments. Andrew, Have you got references - I am interested. Thanks, Ian

Re: [PEDA] Importing .dfx files into Protel

2002-07-02 Thread Ian Wilson
On 02:55 PM 2/07/2002 -0700, Mike Leachman said: All, I am trying to import a file supplied by an IC supplier that contains library of schematic and footprint date. the type is .dfx, protel pukes when I try to open it. Any thoughts? mike The technical term pukes is well understood - however it

[PEDA] Images and Schematic Templates

2002-07-02 Thread Matt . VanDeWerken
I have added a bitmap image to the schematic template I normally use. However, when I apply the template to an existing document, then reopen the document, sometimes the image isn't there. Whether or not the image appears seems to be pretty much a random event. Does anyone know of a remedy for

Re: [PEDA] SPICE sim question

2002-07-02 Thread mariusrf
well, there were lots of these documents added , but the problem was it was all on _microfilms_ . Part numbering system, revisions, flowcharts, principles of operation , lots of stuff on tens and hundreds of archived mcrofilms. This was in a previous life while working for Control Data

Re: [PEDA] Images and Schematic Templates

2002-07-02 Thread DUTTON Phil
Hello Matt, Make sure that your .bmp is in a known library location with your templates, and when you insert it into your template file, insert it from that library location. If you have it in a 'project' directory for example, and open your design from the 'recent edits' list, then Protel will

Re: [PEDA] Images and Schematic Templates

2002-07-02 Thread Thomas
Try putting the bmp in the directory C:\Program Files\Design Explorer 99 SE\System -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, 3 July 2002 12:06 PM To: Protel EDA Forum Subject: [PEDA] Images and Schematic Templates I have added a

Re: [PEDA] Images and Schematic Templates

2002-07-02 Thread Dennis Saputelli
after 'solving' this problem with the help of others here by putting copies of the bitmap all over the f'ing place it seemed to work well and then ... i opened a schematic today and there was no picture, only the text placeholder i give up, it just doesn't work IMHO for the record i have copies

Re: [PEDA] Images and Schematic Templates

2002-07-02 Thread DUTTON Phil
Hello Dennis, (I feel your pain..) When you placed the .bmp into your template file does it have the full path back to the location of the source .bmp file. eg. L:\Protel\Library\templates\TenixLogo.jpg, not just TenixLogo.jpg. (we use a .jpg just because it's smaller) Phil. -Original

Re: [PEDA] Images and Schematic Templates

2002-07-02 Thread Dennis Saputelli
i believe that 'insert graphic' or whatever the menu choice is does whatever it does regarding the path yes there is a path there and yes that is clearly part of the problem (mapped drives letters not matching local ones on other machines) but i don't see how i can intervene in that process

Re: [PEDA] 3D VIEW USING RADEON7000

2002-07-02 Thread Tony Karavidas
Well that turned out to not be true. I downloaded the latest drivers from NVIDIA's web site (version 29.42) and my machine sucks even more. Protel is DOG SLOW when doing 3D which is worse than before. I can see the little 3D nav window now, so it's not all bad... So can we take a poll? I'd like

Re: [PEDA] Images and Schematic Templates

2002-07-02 Thread DUTTON Phil
ok, we are pointing to a common network drive. Standalone machine or from another network would not work. In P98 we used to put the graphic in the same directory as the schematic files and point to it without the drive path. This meant that each project directory had a copy of the graphic. I've

Re: [PEDA] Images and Schematic Templates

2002-07-02 Thread Matt . VanDeWerken
I agree Dennis. A further part of our problem is that we have about 15 computers with Protel installed, all over our site, using floating licenses. The graphic is in a shared directory, which everyone has mapped to the same place, but it still doesn't always work. A solution to this problem

Re: [PEDA] 3D VIEW USING Nvidia Geforce2 (was 3D VIEW USING RADEON7000)

2002-07-02 Thread Tony Karavidas
Update: I uninstalled the driver I just installed, and then went registry hacking to remove other Nvidia stuff (rebooting between each step). I ended up with plain vanilla VGA and then reinstalled the 29.42 driver. My 3D is much faster now, but some of the Nview features aren't working right.