LTSpice Automation

This one will have tens of thousands ...

You guys obviously went to the wrong school. We just shoved the cards through the verifier, and it not only numbered but decoded and printed them. Of course that was 1977, and I was the last one using cards at the entire school--I thought they were fun and didn't want to miss the party.

Cheers

Phil Hobbs

Characterize, then convert the digital to behavioral models, then it'll be easy ;-) ...Jim Thompson

OK, so now that we've all found the help files, can anyone explain what a 'global parameter' is, and how do you make a simulation swallow a .step param xxx statement for a specific component?

RL

OOOPS!

And thanks again, i am getting my Fourier analyses and THD numbers versus= load now.

that=20

=20

Yep, but my spice versions were ISspice 1.94 and ISSpice 386/4 I also had tabular numeric data. Core engine Spice 2f4 and 2g6 IIRC.

that=20

couldn't=20

=20

card.=20

pads,

dot.=20

=20

I quickly got the habit of carrying them with three fresh rubber bands=20 holding them together, in order. Plus small stacks in envelopes, and=20 large stacks in boxes.

In PSpice, you must first "declare" the parameter, very much C-like.

While don't you pursue this in the LTspice Yahoo Group?

I subscribe to their daily digests... lots of good stuff there, even for non-LTspice users. ...Jim Thompson

Those text-mode graphs persisted until the mid-'90s and perhaps even late-'90s at times -- particularly at schools where there's sometimes not the budget or personnel to upgrade the software. In the early '90s while I was an undergraduate, some of the grad students were still actively writing new software for PDP-11s...

It's not digital, the digital parts are a piece of cake :-(

Back when I started, a GUI was a foot long, and made of wood ;-)

First network analysis software I had, I wrote myself. A node-admittance matrix thingy using LU decomposition, in TRS-80 BASIC. Still no GUI.

I still use Berkeley Spice 3f4 occasionally, 'cos it'll do things LTSpice won't,like PZ analysis.

Yup.

When I first started with IBM, we used communicating Selectrics and

We used IBM 029s in high school and college with a 360/75 (amazing beast) at the business end.

Didn't everyone have PCs by then?

In 1994, when I received my BSEE, of the engineering students I knew, I doubt that even half had their own PCs. That was still the era of very large computer labs -- I took some computer science class to learn C, Pascal, and FORTRAN (probably in 1992), and while I had a good enough job that I could afford to buy copies of Turbo C and Turbo Pascal for DOS, I knew FORTRAN was a pretty dead language already and used the college's computer lab. FORTRAN was taught on Macs and the main lab was a huge, poorly-ventilated room in the basement of a ugly concrete building with literally hundreds of Macs and students side-by-side. It wasn't exactly a nice atmosphere!

The next semester I took "assembly langauge on a VAX" -- a room of a couple dozen terminals, much more room per student -- and "data structures and algorithms" -- a room of perhaps 50 HP PA-RISC workstations running HPUX --, and those were actually pretty nice environments.

I had an Amiga 3000 at the time... and while Berkeley SPICE was available, the guys with PCs were already running the free version of PSpice which had much better graphing abilities.

Laptops were quite new and insanely expensive (and machines mere mortals could afford had the crappy highly-multiplexed monochrome LCDs). How far we've come -- today I'd wager >99% of engineering students have PCs, almost all of those are laptops (all active-matrix LCDs now), and nearly all campuses have ubiquitous WFi.

---Joel

Thinking back, at the time a desktop PC still cost the equivalent of perhaps

Amazing. Where did you go to school?

Being forced to sit in a room full of Mac-heads? ...I can only imagine. ;-)

We had a few rooms of 029s (perhaps sixty). They were clean and very bright, if littered with cards and chad. I only took one CS course (well, I started a PDP-8 assembly course but got sick so dropped it).

Sure. That stuff is all cheap now. OTOH, PCs have always been cheap compared to tuition. Even in '82 an entry level machine was about the same (in the same $$) as my HP45 in '73.

Textbooks have gotten expensive. ;-)

My first 386 with a 387 co-processor cost me around $4K, and it was a clone (~1987) ...Jim Thompson

-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at