? ?"Using "uic" in an amplifier having any capacitor is a very bad idea. One waste a long simulated time until the steady state operating point will be reached to the last milli-Volt."
I wholeheartedly agree!
The simulation in the original circuit ran for 10 seconds of simulated time. ?I ran it for >30 seconds, and some of the waveforms were still significantly changing even without having to zoom in to the millivolt level. ?Because the bias points were still shifting, and some of the intermediate signals are low-level, it was having a huge effect on the output.
Removing UIC fixed that.
Andy
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i did all these...process which u said but when i m simulating then it is saying an error that unknown subcircuit about CD4013
On Sunday, June 1, 2014 1:16 AM, "Andy Andrew.Ingraham@... [LTspice]" wrote:
?
Kesi Kumar wrote:
? ?"can anyone do a favor of help that how to get ASC file of CD4013B"
1. ?Go to the group's main webpage
2. ?Read the instructions there about finding and downloading the "Table of Contents" file.
3. ?Get that file. ?Open it in your web browser.
4. ?Search the file for "CD4000.lib". ?You will find that it is located in its own directory of Digital CD4000 family parts. ?Click on the hotlink to the file and it will take you to that directory.
5. ?Download the file "CD4000.lib". ?While you are there, also download the file "CD4000.zip", which has schematic symbols for the CD4013.
6. ?Put the files "CD4000.lib" and "CD4013B.asy" in your working directory where you plan to use it.
FYI, I have not seen an ASC file for the CD4013. ?But the .lib file (above) is a model of the CD4013, just not in schematic form.
Regards,
Andy
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Kesi Kumar wrote:
? ?"can anyone do a favor of help that how to get ASC file of CD4013B"
1. ?Go to the group's main webpage
2. ?Read the instructions there about finding and downloading the "Table of Contents" file.
3. ?Get that file. ?Open it in your web browser.
4. ?Search the file for "CD4000.lib". ?You will find that it is located in its own directory of Digital CD4000 family parts. ?Click on the hotlink to the file and it will take you to that directory.
5. ?Download the file "CD4000.lib". ?While you are there, also download the file "CD4000.zip", which has schematic symbols for the CD4013.
6. ?Put the files "CD4000.lib" and "CD4013B.asy" in your working directory where you plan to use it.
FYI, I have not seen an ASC file for the CD4013. ?But the .lib file (above) is a model of the CD4013, just not in schematic form.
Regards,
Andy
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can anyone do a favor of help that how to get ASC file of CD4013B, actually i forget, i did previously but i m not getting...so if anybody can help me..
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Hello,
>? Is there something wrong about SPICE's ordinary operating point analysis with respect to this amplifier?
Using "uic" in an amplifier having any capacitor is a very bad idea. One waste a long simulated time until the steady state operating point will be reached to the last milli-Volt.
Best regards,
Helmut
|
Marcel wrote:
? ?"With UIC one can provide a hint for the steady-state."
Actually, with UIC, one does not provide a hint. ?One provides the entire steady-state operating point. ?SPICE bypasses finding the operating point and takes what you give it, as the operating point.
If you use IC= or .IC without UIC, then SPICE takes what you have provided as a hint, and continues from there to converge on a steady-state solution.
I find the reason most people use the UIC, is because of not understanding what SPICE does, or because they are simulating something like an oscillator, for which careful use of UIC can be beneficial. ?Otherwise, UIC should mostly not be used, and I don't understand why so many people seem to think that adding it is a useful thing to do.
Is PSS something that really helps analyze a DC coupled audio amplifier? ?Is there something wrong about SPICE's ordinary operating point analysis with respect to this amplifier?
Regards,
Andy
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Re: Li-ion BAttery models
In message <lmcqgn+ui7i2a@...>, dated Sat, 31 May 2014, "thutches@... [LTspice]" <LTspice@...> writes: The only other setting that I have that could affect this is that I use
the BOLD option with Arial 10-pt font, which makes it pop a little
better.. I don't think that makes a significant difference.
So other than resetting to defaults and redrawing my schematic for
this, which is entirely tangential to the original intent of pointing
out the Saft model and how I used it?to the OP, I'm beyond being able
to spend time on it because it seems kind of open-ended as to what
satisfies others about it should look like.
I doubt that anyone expects you to, especially now I've explained how to fix it to use a larger font size and still see everything clearly.
But I'll keep this in mind in the future
The point is that LTspice (and probably most Spices) fixes the position of text on the schematic screen, I think, by the x-y position of the first character. So if the font size changes from a small number to a larger, especially to the default (which is actually the rather enormous Tahoma 28pt Bold), the text strings run over everything in their path. I don't think there is any better way of locating the text, short of setting up 'exclusion areas' around the schematic elements and setting the ends of strings to just touch the exclusion boundary. I think some printed circuit drawing programs do this, but it's very complicated to implement, because a string so placed might intersect another exclusion area along its length. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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Re: Li-ion BAttery models
John,
The only other setting that I have that could affect this is that I use the BOLD option with Arial 10-pt font, which makes it pop a little better..
So other than resetting to defaults and redrawing my schematic for this, which is entirely tangential to the original intent of pointing out the Saft model and how I used it?to the OP, I'm beyond being able to spend time on it because it seems kind of open-ended as to what satisfies others about it should look like.
But I'll keep this in mind in the future.
Tim
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Re: Li-ion BAttery models
I found this, but have not tried it (yet): ?
It is NOT a *SPICE model, but I plan on making one from it.
--Steven Hill Excerpt: "Because the charging process for?Li+?batteries can take an hour or longer, testing a?Li+?battery charger using its natural load is time consuming and frequently impractical. To speed battery-charger testing, this article presents a simple circuit for simulating the behavior of a?Li+?battery. This circuit provides an efficient means of testing?Li+?chargers without using real batteries.
"
On Sat, May 31, 2014 at 10:21 AM, John Woodgate jmw@... [LTspice] <LTspice@...> wrote:
?
In message , dated Sat, 31 May 2014,
" thutches@... [LTspice]" < LTspice@...> writes:
>
>All I uploaded a screen shot of how the circuit looks on my screen.? If
>that is what is considered clumsy, well - it is what it is.
The screenshot is OK. What is in the ZIP is an .asc schematic file, not
a screenshot. All the text areas are superimposed on the actual circuit
elements, so neither are intelligible.
>
>
>Otherwise though, I'm using Arial 10pt font.? that and some other
>setting in my options could be causing it to jumble up on other
>screens.? ???
AHA! Setting the font size to 10 instead of the default fixes the
problem. But it's then difficult to read the text. So MOVE the text
blocks away from the schematic and increase the size until it can be
read.
--
OOO - Own Opinions Only. With best wishes. See
Nondum ex silvis sumus
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
|
Re: Li-ion BAttery models
In message <lmckku+11hc6fs@...>, dated Sat, 31 May 2014, "thutches@... [LTspice]" <LTspice@...> writes:
All I uploaded a screen shot of how the circuit looks on my screen.? If
that is what is considered clumsy, well - it is what it is.
The screenshot is OK. What is in the ZIP is an .asc schematic file, not a screenshot. All the text areas are superimposed on the actual circuit elements, so neither are intelligible.
Otherwise though, I'm using Arial 10pt font.? that and some other
setting in my options could be causing it to jumble up on other
screens.? ???
AHA! Setting the font size to 10 instead of the default fixes the problem. But it's then difficult to read the text. So MOVE the text blocks away from the schematic and increase the size until it can be read. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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>
>Hi
>
>I need the LTspice model for varicap diode MVAM108 or MVAM125.
>Shall appreciate if anybody can help me. >
>
>Best regards
>
>Abu-Hafss
Take a look at VVC.zip on the Device Models & Subcircuits page of my
website...
??????
<>
???????????????????????????????????????
...Jim Thompson
Jim Thompson
35129 North Laredo Drive
San Tan Valley, AZ? 85142
Voice: 480-460-2350?? Fax: 480-460-2142
Wearer of the Brass Rat - Class of 1962
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Re: Li-ion BAttery models
Hello M. Tutches? or Tim Yes your file Charger.jpg is very clear. Your file .asc should be like that. Could you make a "Reset to Default Values" in LTspice ? I'm absolutly not an expert. And I write bad English. Best Regards, PhB
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Re: Li-ion BAttery models
Phillippe, does your screen look like the screenshot I posted??
?If not, I'd like to see what the clumsy screen version of the circuit actually looks like on another screen, so please someone upload a screenshot.? Hopefully I can learn to make my circuits "not-so-clumsy", so that If I ever post something, it doesn't create total confusion and consternation.
?:-)
Thanks,
Tim
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Re: Li-ion BAttery models
Hello M. John Woodgate Some years ago, I saw the sale problem. I can't remember the reason why. Very hard to try to make this schematic clearer. Bests Regards, PhB
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Re: Li-ion BAttery models
All I uploaded a screen shot of how the circuit looks on my screen.? If that is what is considered clumsy, well - it is what it is.
Otherwise though, I'm using Arial 10pt font.? that and some other setting in my options could be causing it to jumble up on other screens.? ??? Tim
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Re: Li-ion BAttery models
In message <lmchu0+ui59cn@...>, dated Sat, 31 May 2014, "basier.philippe@... [LTspice]" <LTspice@...> writes: In the file you have uploaded all comments, LTspice directives, models and
subckt are on the schematic drawings.
So your schematic is quasi unreadable ( for me ).
Could you make your file clearer I suspect that the uploaded/downloaded .asc doesn't look like the author's original. I suggest he looks at it, so as to understand the problem. What has caused it? Helmut, do you have an explanation? -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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Re: Li-ion BAttery models
Hello M. Tutches In the file you have uploaded all comments, LTspice directives, models and subckt are on the schematic drawings. So your schematic is quasi unreadable ( for me ). Could you make your file clearer ? Bests Regards, PhB
|
PSS == Pseudo Steady-State algorithm (e.g. http://www.mos-ak.org/sanfrancisco_2012/presentations/T05_Lannutti_MOS-AK_121212.pdf).? A PSS is useful for power electronics circuitry (where the steady-state is a trajectory in state-space).
When the option UIC is *not* used,?SPICE?automatically finds an initial solution?at t=0. This?works (very) well for most analog (non-switching) circuits.?With UIC one can provide a hint for the steady-state. IMHO this should be faster in all non-trivial cases, but I notice that the experience of people in this forum is different.
A?brute-force PSS algorithm?simply runs a .tran until you detect that the state trajectories are converging. This convergence is actually?quite?tricky to detect, especially when there is feedback involved.
I hope this answers your question.
-marcel
|
Marcel wrote:
? ?"I am not aware that LTSpice has a PSS algorithm?"
What is a PSS algorithm?
Regards,
Andy
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Re: Waveform export from Mac LTspice?
Hello,
There are few hints in the Files section.
Files > MAC
?
Best regards,
Helmut
|
thutches