1. Home
  2. Electronics Computer-Aided Design
  3. LTSpice: importing netlists

LTSpice: importing netlists

I've been trying to get a bit more familiar with LTSpice, after several years using CircuitMaker. One aspect I'm playing with is exporting a Spice netlist from CircuitMaker and then running it in LTSpice. For example, I drew this trivial circuit in CM (copied from Rashid's 'Spice for Circuits and Electronics Using PSpice'):

formatting link

Using CM's graphical interface, I can display up to 24 Operating Point results.

Then I exported the netlist from CM, which gave me this file, Rash2-1.NET:

*Spice netlist for Circuit: C:\\My Documents\\Electronics\\CIRCUIT DIAGRAMS\\My Experiments\\LearnSPICE.ckt Is 0 3 50mA V2 6 3 DC 0V V1 4 0 DC 0V Vs 7 0 20V R4 0 3 200 R3 4 5 1k R2 5 6 800 R1 7 5 500 ..SAVE V(3) V(4) V(5) V(6) V(7) @is[p] @is[v] @v2[p] v2#branch @v2[z] @v1[p] ..SAVE v1#branch @v1[z] @vs[p] vs#branch @vs[z] @r4[p] @r4[i] @r3[p] @r3[i] ..SAVE @r2[p] @r2[i] @r1[p] @r1[i] *BKGND=RGB 0 0 0 *BINARY RAW FILE

  • Selected Circuit Analyses : ..OP ..END

As a check, I first ran CM and imported and simulated the netlist file. As expected, I got the same 24 results offered for optional display:

GND is1[p] is1_2 r1[i] r1[p] r2[i] r2[p] r3[i] r3[p] r3_2 r4[i] r4[p] vs1#branch vs1[p] vs1[z] vs1_1 vx#branch vx[p] vx[z] vx_1 vy#branch vy[p] vy[z] vy_1

Then I opened the same Spice netlist in LTSpice, and used Simulate>Run. But only these 8 results were displayed:

V(vy_1) V(is1_2) V(vx_1) V(vs1_1) V(r3_2) I(Vs1) I(Vx) I(Vy)

Could an LTSpice user advise if I can get all 24 nodes, or whatever subset of interest I select please.

--
Terry Pinnell
Hobbyist, West Sussex, UK
Reply to
Terry Pinnell
Loading thread data ...

Terry,

I think you're having trouble receiving posts from the Yahoo LTspice users' group. Maybe you set your membership to elect not to receive emails. You can browse the postings directly at the URL

formatting link
for answers to the all the questions you posted there.

For your reference, below is what I posted there yesterday w.r.t. to your current question:

Remove the .save statement. LTspice uses different cleaner syntax there. For example, instead of "vs2#branch" it's I(vs2). So remove the .save statement so that all nodes are saved. Also, you might go to Tools=>Control Panel=>

Save Defaults and check the top three. This is used if there are no .save statements.

Alterntively, you can use wildcard matching in LTspice. E.g., add ".save V(*) I(*)" to save all currents and voltages.

--Mike

Reply to
Mike Engelhardt

Thanks Mike. Will study that. Definitely must be a problem with my mail then, because I see my original posts but no replies.

--
Terry Pinnell
Hobbyist, West Sussex, UK
Reply to
Terry Pinnell

Hello Terry,

Consider using the gmane server via your newsreader to read Yahoo groups. That gets around the clumsy web interface and I use it to read while posting through the Yahoo site.

Regards, Joerg

formatting link

Reply to
Joerg

Hello Helmut,

Take it easy. It does happen that technology fails. With Yahoo (MSP430 group) I have experienced "vanished posts" myself. Later they pop back up. I found that out because I could read posts on the gmane server and when I wanted to reply to them via the Yahoo interface I couldn't find them there. For my taste that message window is, well, a bit pathetic.

It's the same with newsgroups. Messages proliferate to other servers but sometimes a whole bunch of them falls off the truck. So while folks in one part of the world can see them, folks in another with another ISP can't. Just a couple days ago I had that right here. Only quotations in people's answers allowed me to partially piece together what had been discussed so far.

Anyway, I wish that groups including the LTSpice group would be on usenet instead of some glitzy web interface. Keeping it simple.

Regards, Joerg

formatting link

Reply to
Joerg

Hello Terry,

please go to the Yahoo group and read the replies. Don't wonder that you have have got a little fire there in one of my replies.

Why do you exepect that the replies come to you? If I answer a question there than I expect that the person who asked the question knows how to login to the Yahoo group.

Go to that address and read the answers.

formatting link

Best regards, Helmut

Reply to
Helmut Sennewald

Helmut: First, thanks very much for your thorough replies to my posts

- much appreciated. I have yet to study them properly, but hope to do that tomorrow. I'd begun to think that the group was just very quiet, and that you in particular were on your vacation .

I'm used to seeing all discussion from other similar groups (including another via Yahoo Groups) here in my newsreader. I had long ago subscribed to the LTSpice mailing list, and until recently I'd seen hundreds of discussions here in my Agent newsreader (all filtered to my 'LTSpice' folder). So I was looking out especially for any replies to my own thread! Still not sure why I didn't see them, so I will investigate.

Meanwhile, the Yahoo environment offers some clear benefits - especially file access. I reckon I still prefer the less glitzy and more 'sober' atmosphere of Usenet though!

Joerg: Thanks for your posts. I'm very curious about this 'gmane server' and intend to follow up.

Glad I decided to post here in cad; I may never have discovered the problem otherwise!

--
Terry Pinnell
Hobbyist, West Sussex, UK
Reply to
Terry Pinnell

Hello Helmut,

Yes, that's a point. One concern I always had with gmane is that they don't allow or at least used to not allow "munged" email, and Yahoo doesn't either. That opens the door to spambots.

Well, that would only leave email. Overall I believe that usenet is much more lively than any of the web-based forums. If it has to be protected it would be best if someone who has enough web space could host the group, like Cadsoft does for their Eagle support.

Regards, Joerg

formatting link

Reply to
Joerg

"Joerg" schrieb im Newsbeitrag news:aaKne.1545$ snipped-for-privacy@newssvr13.news.prodigy.com...

Hello Joerg, this gmane server will not(no more) provide the messages of the LTSpice group. A week ago I stopped that gmane copies the LTspice group messages. The members of the LTspice group have the right, that messages posted in the group are privately kept in the Yahoo group.

Best regards, Helmut

Acting moderator of the LTspice Yahoo group

Reply to
Helmut Sennewald

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.