Re: Mike Engelhardt at Electronica
Hello Mike,
I assume it's this book below or is it another version or language?
Best regards, Helmut
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Re: parameters (.model) mosfet
Very first hit when Googling VTO:
Jan
?
I do not know wrote multiple times this question... In help I did not find, about Whats mean the parameter (vto) in (.models) for MOSFET.
?
j.bernabe1 wrote (again):
? ? "Once in standard.mos file, In the (.model) transistor, What mean the parameter (vto) ??"
There's no need to ask the same question multiple times.
Read LTspice's Help.? It is answered there.
More detailed descriptions can be found elsewhere (e.g., PSPCREF).
Regards, Andy
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Mike Engelhardt at Electronica
And I'm giving out Brocard's book.
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Meet Mike Engelhardt at electronica 2018, Munich
Mike is also present at electonica this year, at the Analog Devices booth . I talked to him there yesterday, listened to a short presentation by him and got a free signed copy of the book .
Best regards, Frank
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Behavioral source timestep limits ?
Hello, :
May I ask, is there any limitation when using the behavioral source (bv, bi) ? I found it seems there are some differences in my simulations, when I tried to add the BV behavioral voltage source to do some math manipulation of a feedback signal in a application schematic (eg: flyback, etc), before adding the BV into the feddback, the simulation ran quite normal as expected, but after adding the BV to the feedback, the "FB" signal seems having larger swing amplitude which makes the output to switch separated in chunks (many time durations), the only thing I doubt caused those differences is the timestep, the simulation without adding the BV model, ran into smaller timestep while the one with BV didn't, the worse resolution of the simulation made the errors.
So , may I confirm, what's the difference(/limitations) when using BV in those kinds of applications ?
Thank you very much
Have a nice day!
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Re: parameters (.model) mosfet
Javier Bernabe wrote:
"I do not know wrote multiple times this question... In help I did not find, about Whats mean the parameter (vto) in (.models) for MOSFET."
Perhaps you have a different Help file to me...
This is how to do it.
In LTspice, press [F1] -> Help opens
In the search bar, type "vto" Press "List Topics" -> Listed topics: JFET, MOSFET, MESFET, IGBJT
Every occurence of the search text is highlighted in the right pane, where the meaning of every parameter used in the standard MOSFET models is listed, if you select the topic "MOSFET".
Regards, Tony
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Re: Problem finding DC op point with LT8609S
Many thanks for all the sage advice. I will try all those suggestions. I am interested in how it starts up, so setting g Al voltages and currents to zero sounds reasonable to me. I independently found another solution. I used ptrannax=0.00001 .IC(L1) =0.... And that got me underway. Your other suggestions seem better... Many thanks.. all good now...
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Re: parameters (.model) mosfet
Vto is the threshold voltage of the transistor in the spice model of the transistor. In the simplest models at this voltage, the current of the transistor is zero. But when sub-threshold currents are lost (Vgate-source), this is not the case. Those. in the real transistor there is no such parameter. In the reference data indicate the values at some current! And the more powerful the transistor, the greater this reference current. ? Bordodynov.
14.11.2018, 11:04, "Javier Bernabe j.bernabe1@... [LTspice]" <ltspice@...>:
?
I do not know wrote multiple times this question... In help I did not find, about Whats mean the parameter (vto) in (.models) for MOSFET.
?
j.bernabe1 wrote (again):
? ? "Once in standard.mos file, In the (.model) transistor, What mean the parameter (vto) ??"
There's no need to ask the same question multiple times.
Read LTspice's Help.? It is answered there.
More detailed descriptions can be found elsewhere (e.g., PSPCREF).
Regards, Andy
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Re: parameters (.model) mosfet
I do not know wrote multiple times this question... In help I did not find, about Whats mean the parameter (vto) in (.models) for MOSFET.
En martes, 13 de noviembre de 2018 22:34:17 CET, Andy ai.egrps@... [LTspice] escribi¨®:
?
j.bernabe1 wrote (again):
? ? "Once in standard.mos file, In the (.model) transistor, What mean the parameter (vto) ??"
There's no need to ask the same question multiple times.
Read LTspice's Help.? It is answered there.
More detailed descriptions can be found elsewhere (e.g., PSPCREF).
Regards, Andy
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Re: Problem with using LM4562
It might well be possible to post a modified version that shows
the problem but not the confidential part. In any case, some
claims of confidentiality are given greater importance than is
justified, compared with finding the solution without wasting
time.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
Rayleigh, Essex UK
toggle quoted message
Show quoted text
?
I think
Alan said he can't reveal his schematic because it is
proprietary.
Therefore,
he is on his own.
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Hello Helmut I will keep the suggested lower limit of 10mOhm in mind. It seems you could use 1 Ohm and its negative value just fine. -- Vlad ______________________ ltspicegoodies.ltwiki.org -- holding, among others: a universal analog/digital filter, block-level models for power electronics (and not only), math blocks with a more stream-lined approach, some digital ADC, DAC, (synchronous-)counter, JKflop, etc.
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Re: Problem with using LM4562
Can you elaborate on this difference (for us non-native).
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Show quoted text
?
Bordodynov, for me (speaking English in USA), there is a
difference between "working point" and "operating point".
That is why I wanted to mention it -- so that people know
that your file was about the "operating point".
Andy
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Re: introduction of a new vacuum tube spice model approach
Adrian,
In response to your request a few days ago, I uploaded printscreens of my attempts to find your ZIP file.? Photos are in Photos > "Screen shots from Adrian's website ".
On 7 November you provided this link:??which you said was for a zip file of your triode models.? "AdrianPage1.png" is what I see when I go to that link.? The link itself doesn't go to the zip file, and I don't see a link on that page to the zip file.
If I click on "... for vacuum tubes" near the top, I get to this page: "AdrianPage2.png".? Both the German and English have a "link" near the top.? But that link doesn't go to the zip file either.? It goes to only a PDF file, which is shown in "AdrianPage3.png".
So if I go back again to the previous page, and scroll down and down, there are SPICE Netlists, and graphs.? I did not see anything about a zip file.? I did see six links to subcircuits for six different triodes.? I thought that was all there was.
However, if I actually search that page for "zip", indeed it is there!? Until today, I did not see that.? ("AdrianPage4.png")? There was so much other stuff on that page, that I went right past it and did not see it.? It is about a third of the way (about 6 screenfuls) down a very long webpage.
So, you are correct that the link to the zip file is there -- but it was almost impossible to find it until I used my web browser's Search (ctrl-F).
Normally I am not a big fan of making things so obvious that they jump out at you.? However this was a case of the opposite, where it was almost hidden.
Regards, Andy
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Re: Problem with using LM4562
Thank you Endy. But GOOGLE translates to me two different words in your letter into Russian equally, namely as a working point. Although the regime point, Google translates right. ? Bordodynov.
14.11.2018, 09:35, "ai.egrps@... [LTspice]" :
?
Bordodynov, for me (speaking English in USA), there is a difference between "working point" and "operating point". That is why I wanted to mention it -- so that people know that your file was about the "operating point".
Andy
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Re: Problem with using LM4562
Bordodynov, for me (speaking English in USA), there is a difference between "working point" and "operating point". That is why I wanted to mention it -- so that people know that your file was about the "operating point".
Andy
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Re: Problem with using LM4562
Andy. I am sorry, but for me it is synonymous. Although your clarification is correct. In the absence of a signal, they are equal. ? Bordodynov.
14.11.2018, 08:31, "Andy ai.egrps@... [LTspice]" :
?
Bordodynov, where you wrote "working point", I'm guessing you mean the "operating point"?
Andy
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Re: Negative value elements
Hello Andy. I was studying (and upgrading) models of tunnel diodes and met a model that used a negative resistor. After that, I experimented with negative capacitors (I tried to realize a skin effect). ? *Tunnel Diode Default ?MCE ?A K ?7-14-95 *MCE 600V 50A 27.2ns pkg:TO-220 .SUBCKT XTUNNEL 1 2 RS ?1 3 ?6 RP ?3 4 ?-75 CP ?3 4 ?0.6E-12 LS ?4 2 ?0.1E-9 .ENDS XTUNNEL ? Bordodynov.
14.11.2018, 08:26, "Andy ai.egrps@... [LTspice]" :
?
If I remember correctly, some SPICE programs do not allow negative component values.? I always thought this was an interesting feature of LTspice.
Andy
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Re: Problem with using LM4562
Bordodynov, where you wrote "working point", I'm guessing you mean the "operating point"?
Andy
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Re: Problem with using LM4562
Hi. Look at my example in the file. See MCP6001.ZIP in TEMP folder. ? Bordodynov.
14.11.2018, 07:56, "Andy ai.egrps@... [LTspice]" :
?
Dave Wade,
Thanks for the information about Windows usernames.? That is interesting.
Andy
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Re: Negative value elements
If I remember correctly, some SPICE programs do not allow negative component values.? I always thought this was an interesting feature of LTspice.
Andy
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Jan Didden
Mike Engelhardt
Frank Wiedmann
Tony Casey
John Woodgate