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I was curious if there is any prospect or plan for upgrade to, enchance LTspice or are u being restricted by ltc company.

I do not see much upgrade for some time now but it is very bug free.

For example dual or 4 y axis scale for different readout
Direct waveform measurement like scope
Wizard to implement models so we can implement generic symbol with 3rd vendor
Customized shortcuts keys
Wizard to support measure feature.
Link to forums example library and discussion

We happy to pay for premium release for DIY user. Ie lower price than pspice.

Tux

Riscy

I do not see much upgrade for some time now but it is very bug free.

For example dual or 4 y axis scale for different readout
Direct waveform measurement like scope
Wizard to implement models so we can implement generic symbol with 3rd vendor
Customized shortcuts keys
Wizard to support measure feature.
Link to forums example library and discussion

Some of those features exist already in LTspice. (Perhaps what you
were asking wasn't clear to me?)

If you have recommended enhancements and improvements to add to
LTspice, you can suggest them to the program's author. He won't know
that we users need something added unless we tell him!

Andy

--- In LTspice@..., "Richard" <riscy00@...> wrote:

I was curious if there is any prospect or plan for upgrade to, enchance LTspice or are u being restricted by ltc company.

LTspice is made by the company LT. So mainly it uses LT parts. And i's free.
But as LTspice is compatible with Spice, mostly you may use models developed for Spice. (and there are many) to be contrary to Hpice or Tina.

Btw Tina by TI is also free, but i think more restricted to TI parts as LTspice to lt parts.

Mike Engelhardt is the creator of LTspice and is an employee of LT. From the grapewine: An extended version of LTspice is internally used to develop new LT IC's

Helmut Sennewald, moderator of this group, is a german and not related or paid in any way by LT.
Btw: Thank you Helmut for your patience and time. Maybe we meet personally on one of next europe tour of Mike.

hws

--- In LTspice@..., "Richard" <riscy00@...> wrote:

I was curious if there is any prospect or plan for upgrade to,
enchance LTspice or are u being restricted by LTC company.

Hello Riscy,

LTspice is SPICE. You can use any SPICE model from any
component vendor.
Why do you think it's restricted?

I do not see much upgrade for some time now but it is very bug
free.

I am sure Mike will add new features in the future.

For example dual or 4 y axis scale for different readout.

LTspice a feature named "Plot Panes" and automatically plots
more vertical scales if you plot items with different units.
Are you aware of that?

Direct waveform measurement like scope.

I don't expect such features like scope measurements.

Wizard to implement models so we can implement generic
symbol with 3rd vendor.

Some help to create a symbol is already implemented.

Customized short cuts keys

They are already implemented.

Control Panel -> Drafting Options
Control Panel -> Waveforms

Wizard to support measure feature.

OK, it's not implemented. I think this could be very helpful.
Maybe you or somebody will write one in the future.

Link to forums example library and discussion

Links to the Internet are always a problem.
I recommend to search in all_files.htm of this group.

We happy to pay for premium release for DIY user.
Ie lower price than pspice.
Tux
Riscy

I prefer to have only one version, the free one.
You can pay money if you like. Somebody offers an
optimizer (49$?).


If you have wishes for new features in LTspice, you should
send them to Mike, the author of LTspice. His address is
the email address given in the Help -> About.

Best regards,
Helmut

In message <k1d6qc+gecf@...>, dated Sun, 26 Aug 2012, Helmut <helmutsennewald@...> writes:

For example dual or 4 y axis scale for different readout.

LTspice a feature named "Plot Panes" and automatically plots more vertical scales if you plot items with different units. Are you aware of that?

You can have ONE plot with a Y-axis on the left and another on the right in certain cases, such as AC sweeps, and if you plot a current and a voltage simultaneously.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Instead of saying that the government is doing too little, too late or too
much, too early, say they've got is exactly right, thus throwing them into
total confusion.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Mike has said, in the LTspice World Tour seminars, that the extended versions of LTspice are used internally within Linear for chip design. He has said, specifically, that certain features, that would make it "too easy" for other parties to replicate LT parts will never appear in the public version of LTspice.

Likewise, by inference, if someone asks for a change that would require changes by LT employees, I'd bet that the benefit would have to be very high.

Jim Wagner
Oregon Research Electronics

On Aug 26, 2012, at 5:26 AM, Heinz-W. Schockenbaum wrote:

--- In LTspice@..., "Richard" <riscy00@...> wrote:

I was curious if there is any prospect or plan for upgrade to, enchance LTspice or are u being restricted by ltc company.

LTspice is made by the company LT. So mainly it uses LT parts. And i's free.
But as LTspice is compatible with Spice, mostly you may use models developed for Spice. (and there are many) to be contrary to Hpice or Tina.

Btw Tina by TI is also free, but i think more restricted to TI parts as LTspice to lt parts.

Mike Engelhardt is the creator of LTspice and is an employee of LT. From the grapewine: An extended version of LTspice is internally used to develop new LT IC's

Helmut Sennewald, moderator of this group, is a german and not related or paid in any way by LT.
Btw: Thank you Helmut for your patience and time. Maybe we meet personally on one of next europe tour of Mike.

hws

[Non-text portions of this message have been removed]

I wish to thank as well to Helmut.
Does the company LT spice intends to make upgrade on LTSpice to improve useability?

Hi Helmut thank for the reply, it is much appericated.

One thing I found in LTSpice is the documentation, I was reading about .measure feature which is very difficult to understand them until I went to LTSpice forum which point to example which make sense this way, then I look back to document and sorry it did not work out.

My comment under ###

--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:

--- In LTspice@..., "Richard" <riscy00@> wrote:

I was curious if there is any prospect or plan for upgrade to,
enchance LTspice or are u being restricted by LTC company.

Hello Riscy,

LTspice is SPICE. You can use any SPICE model from any
component vendor.
Why do you think it's restricted?

### I do not say Spice is restricted but feature of the LTSPice appears to be restricted because LTC, I fear only interest in supporting their products and model.

I do not see much upgrade for some time now but it is very bug
free.

I am sure Mike will add new features in the future.

### I'm not convinced. There are several features that could be upgraded by obvious demands, but it has it not for a while. I would be nice to see what Mike plan for upgrade on LTSpice.

For example dual or 4 y axis scale for different readout.

LTspice a feature named "Plot Panes" and automatically plots
more vertical scales if you plot items with different units.
Are you aware of that?

###Sorry I should make myself clear, I was referring to independent Y-axis scale of 2,3,4 type, ie one y-axis -1V to +1V and other y-axis -50V to +10V and so on. When doing noise/interference analysis, one axis show uV scale while the PSU O/P with ripple on V scale.

Direct waveform measurement like scope.

I don't expect such features like scope measurements.

### It would be good feature in any cases, it more direct than .measure.

Wizard to implement models so we can implement generic
symbol with 3rd vendor.

Some help to create a symbol is already implemented.

### Please advise, maybe I missed that.

Customized short cuts keys

They are already implemented.

Control Panel -> Drafting Options
Control Panel -> Waveforms

### thanks.

Wizard to support measure feature.

OK, it's not implemented. I think this could be very helpful.
Maybe you or somebody will write one in the future.

I'm not employee of the LTC, and it does not support 3rd party extension implementation. Maybe it would be good thing to have for community to write their own feature.

Link to forums example library and discussion

Links to the Internet are always a problem.
I recommend to search in all_files.htm of this group.

### Okay np.

We happy to pay for premium release for DIY user.
Ie lower price than pspice.
Tux
Riscy

I prefer to have only one version, the free one.
You can pay money if you like. Somebody offers an
optimizer (49$?).

### What this?, link if you please?

If you have wishes for new features in LTspice, you should
send them to Mike, the author of LTspice. His address is
the email address given in the Help -> About.

Best regards,
Helmut

### I send this copy to mike, once again thank for forum.

Sorry I was referring to independent Y-axis scale link to the waveform. The current arrangement is too limited.

In message <k1f6b3+f6lm@...>, dated Mon, 27 Aug 2012, Richard <riscy00@...> writes:

###Sorry I should make myself clear, I was referring to independent Y-axis scale of 2,3,4 type, ie one y-axis -1V to +1V and other y-axis -50V to +10V and so on. When doing noise/interference analysis, one axis show uV scale while the PSU O/P with ripple on V scale.

You can use waveform arithmetic to do that. To plot a microvolt value Vu with tens-of-volt values, click on 'Vu' at the top of the plot and enter 'Vu*1E7' in the dialogue box.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Instead of saying that the government is doing too little, too late or too
much, too early, say they've got is exactly right, thus throwing them into
total confusion.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Does the company LT spice intends to make upgrade on LTSpice to improve useability?

In case it wasn't clear already ...

This forum is essentially a user's group, a collection of LTspice
users. It is not run by Linear Technology Corporation (LTC)
(www.linear.com), and is not even moderated by them. Yes there is at
least one employee of Linear who visits here often, but he (Mike) is
not a moderator here. We are LTspice users, not LTspice program
developers.

I think the person to direct this question to, is Mike; and/or the
management of Linear Technology, the company behind LTspice. The
other 38,000 people here don't work for Linear and have no direct say
in the program's development.

However, my personal view is that LTspice is, and has continually been
improved. and I expect that this trend will likely continue. But I
don't speak for the management of LTC.

If you don't think LTspice has improved over the years, then you may
have a very narrow view of what features it needs, only to suit your
specific requirements. LTspice has a wide user base and its features
have expanded to meet the needs of that user base. It handles
3rd-party SPICE models (non-Linear Tech products) very well and I
would guess that the vast majority of users are using it with
3rd-party models. (Yes there are exceptions; encrypted HSpice models
are an example of that.) I would not expect LTspice to ship complete
with non-LTC SPICE models built-in to the program or in its libraries.

Are you looking for a statement from their Board of Directors, saying
that they intend to continue development of and improvements to the
program?

Andy

Hi Helmut,

as always, I am deeply appreciative of this group, of your moderation and assistance, and to LT for making it free.

having said all that, I have noticed one thing that I don't think is directly my fault in being a most NON-expert user of LTspice: when I use an outside .asy and .subckt, it sure seems to me that I get a lot more run errors of all kinds.

For example, I had to give up on using TI's TL081 op amp symbol and model, because LTspice kept insisting - but in an oddly random fashion; it wasn't every time - there was a floating node. I examined the .asy in great detail; I examined the .subckt in great detail; I examined the circuit connections in exhaustive detail; nowhere could I find any hint of why LTspice was rejecting the .asy or the .subckt, but I eventually just had to give up and use the "universal op amp" symbol and LTspice's built-in model for it. I would have used an LT op amp, but it was extremely difficult for me to figure out which LT op amp was comparable to the TL081; I eventually gave up on that as well, despite searching over and over again through the LT website (without the help of a cross-reference, of course).

So, it's weird...on the one hand, LTspice is free, this group is free, and why should I complain? I am not complaining. It's just that if I could get a spice that worked really well with a good user interface for $250, where I could use all the devices out there without huge hassle, I would switch in a heartbeat.

I almost went for Beige Bag's spice, but there were too many downsides to it. I am going to look for the "optimizer" you mention; I would gladly pay $45 for anything that would make using LTspice easier.

VB, Maturin

--- In LTspice@..., "Gandolf" <charlesknouse27@...> wrote:

Hi Helmut,

as always, I am deeply appreciative of this group, of
your moderation and assistance, and to LT for making it free.

having said all that, I have noticed one thing that
I don't think is directly my fault in being a most
NON-expert user of LTspice: when I use an outside .asy
and .subckt, it sure seems to me that I get a lot more
run errors of all kinds.

Hello,
I wonder what you did. My colleagues and I permanently use
models from LTC and other companies at the same time. They
have no problems with that except that some models hardly
converge, but this can happen with any SPICE simulator.
Most users who are in trouble with missing files had made
directory structures for their symbols and models instead
of just placing them in the folder of the schematic.

Many examples (symbols, models) are in the group's Files
especially in "Files > Libs".

...
So, it's weird...on the one hand, LTspice is free, this
group is free, and why should I complain? I am not
complaining. It's just that if I could get a spice that
worked really well with a good user interface for $250,
where I could use all the devices out there without huge
hassle, I would switch in a heartbeat.

At some point I give up to convince somebody using LTspice.
It seems it's the case here.

Best regards,
Helmut

On 27/08/2012 20:58, Gandolf wrote:

For example, I had to give up on using TI's TL081 op amp symbol and model,

I've been using TI's TL081 model without any problems but created my own symbol, just copied something else and renamed it.

Gordon
--

--- In LTspice@..., "Gandolf" <charlesknouse27@...> wrote:

Hi Helmut,

as always, I am deeply appreciative of this group, of your moderation and assistance, and to LT for making it free.

having said all that, I have noticed one thing that I don't think is directly my fault in being a most NON-expert user of LTspice: when I use an outside .asy and .subckt, it sure seems to me that I get a lot more run errors of all kinds.

For example, I had to give up on using TI's TL081 op amp symbol and model, because LTspice kept insisting - but in an oddly random fashion; it wasn't every time - there was a floating node. I examined the .asy in great detail; I examined the .subckt in great detail; I examined the circuit connections in exhaustive detail; nowhere could I find any hint of why LTspice was rejecting the .asy or the .subckt, but I eventually just had to give up and use the "universal op amp" symbol and LTspice's built-in model for it. I would have used an LT op amp, but it was extremely difficult for me to figure out which LT op amp was comparable to the TL081; I eventually gave up on that as well, despite searching over and over again through the LT website (without the help of a cross-reference, of course).

So, it's weird...on the one hand, LTspice is free, this group is free, and why should I complain? I am not complaining. It's just that if I could get a spice that worked really well with a good user interface for $250, where I could use all the devices out there without huge hassle, I would switch in a heartbeat.

I almost went for Beige Bag's spice, but there were too many downsides to it. I am going to look for the "optimizer" you mention; I would gladly pay $45 for anything that would make using LTspice easier.

VB, Maturin

Maturin,

I agree with Helmut on this one. I put all the relevant files you posted to the MATURIN TEMP folder into a common folder on my PC and the circuit ran fine except the LM139 model was not present. I deleted it and all the stuff around it, and the rest was fine.

As Helmut says, always put all you models in the same folder as your top level schematic. The is nothing wrong with LTspice, but it can't do anything about cockpit errors (except give a reasonable error message) or crappy models (except give a reasonable error message).

Rick

Hi VB

I use the universal op amp 2.
You tweak the params to match youre device.
Works Every time!

Ditto for mosfets.
Never use out side models / subcircuits
if you can help it.

Al D.


On 08/27/2012 03:58 PM, Gandolf wrote:

For example, I had to give up on using TI's TL081 op amp symbol and

model, because LTspice kept insisting - but in an oddly random fashion; it wasn't every time - there was a floating node.

-- AC2CL I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything. - Nikola Tesla