Hello All,
?
I changed the models concerned to alpha notation in order to match the alpha-based symbols and all is good.
But now my issue is with obtaining a .mout file.
If I do "File-Execute .Measure Script" from the plot window I get a .mout file.
But, if I add ".inc Original.meas" to a schematic, the measurements can be seen to run but, no .mout file is created.
?
This defeats the purpose of having a -b batch mode.
Does anyone know how to force LTspice to create that .mout file?
?
All for now
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Here is the original detector article.
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On May 31, 2024, at 8:54?PM, Jim Wagner <wagnejam99@...> wrote:
Aaarg spell checker~ ?Tayloe
Jim On May 31, 2024, at 8:43?PM, Jim Wagner <wagnejam99@...> wrote:
That is an awfully simple circuit to need a pre-made model. ?There are some good articles by Taylor, himself, that provide all the gory details.
Jim On May 31, 2024, at 8:34?PM, Robert Nickels <ranickels@...> wrote:
True.? The Tayloe Detector model here is the one that I was interested in:
Bob
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Aaarg spell checker~ ?Tayloe
toggle quoted message
Show quoted text
On May 31, 2024, at 8:43?PM, Jim Wagner <wagnejam99@...> wrote:
That is an awfully simple circuit to need a pre-made model. ?There are some good articles by Taylor, himself, that provide all the gory details.
Jim On May 31, 2024, at 8:34?PM, Robert Nickels <ranickels@...> wrote:
True.? The Tayloe Detector model here is the one that I was interested in:
Bob
|
That is an awfully simple circuit to need a pre-made model. ?There are some good articles by Taylor, himself, that provide all the gory details.
toggle quoted message
Show quoted text
On May 31, 2024, at 8:34?PM, Robert Nickels <ranickels@...> wrote:
True.? The Tayloe Detector model here is the one that I was interested in:
Bob
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True.? The Tayloe Detector model here is the one that I was interested in:
Bob
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Re: opamp with offset pins
I haven't read the book yet, I imagine that when it comes to the models there isn't much to change, more due to the theme and how it is dealt with.
Em sex., 31 de mai. de 2024 ¨¤s 23:21, Andy I via <AI.egrps+io= [email protected]> escreveu:
Carlos wrote:
? ?
That looks maybe not quite exactly, but very nearly identical to the LM741.asc that is already on your computer, in the folder examples > Educational.? (See message #153898.)? It's from the LM741/uA741 datasheets from decades ago.
Andy
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Re: opamp with offset pins
Carlos wrote: ? ? That looks maybe not quite exactly, but very nearly identical to the LM741.asc that is already on your computer, in the folder examples > Educational.? (See message #153898.)? It's from the LM741/uA741 datasheets from decades ago. Andy
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Re: opamp with offset pins
I found the first edition of the book Replicated on a website, by Professor Gordon W. Roberts, follows the link below if someone else may need.
--
Carlos Delfino Quem sou:?
Keybase (PGP): ORCID:?
Celular: ? ? ?(85)?985-205-490 (OI) - Aquiraz/CE ¡°Para o Triunfo do Mal, s¨® ¨¦ preciso que os homens de bem n?o fa?am nada¡± - Edmund Burke ¡°Ningu¨¦m comete erro maior do que n?o fazer nada porque s¨® pode fazer um pouco¡± - Edmund Burke
Conhe?a o Curso Maker (Arduino Minas): ? Arvore dos Saberes/Tecnologia no Social: ?
Em qui., 30 de mai. de 2024 ¨¤s 00:56, Spehro Pefhany via <speff= [email protected]> escreveu:
At 07:27 PM 2024-05-29, you wrote:
Greetings everyone, I need a 741
model or it could be another op amp that has offset correction pins, the
need for these pins is because I'm making some circuits for teaching
purposes, such as the full wave rectifier precision, these circuits are
didactic and reinforcement in nature.
grateful
--
Carlos Delfino
Quem sou:?
Keybase (PGP):
ORCID:?
You can just add the two pins to a transistor-level model of the LM741.
If you can't find a decent transistor-level SPICE model, Sedra/Smith has
one in Chapter 10 of?
SPICE for for Microelectronic circuits, 3rd edition
You would connect the tops of the two 1k resistors R1 and R2 in Fig. 10.1
As others have said, using the offset null pins tends to introduce
excessive temperature dependence.
Best regards,
Spehro Pefhany
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Re: opamp with offset pins
The diagram appears to have the pins, but the posts do not have concrete information on the topic. The link to github is invalid and there is no repository with a similar name in the author's account.
The post is very old too.
Em sex., 31 de mai. de 2024 ¨¤s 17:47, hyu hyu via <hyu2123= [email protected]> escreveu:
Hello Carlos.
I think that PSpice has the LM741 with the offset null pins (1 and 5).?
In this link you can see it:
Hyu
On Friday, May 31, 2024 at 12:51:05 AM GMT-3, Carlos Delfino < consultoria@...> wrote:
Here's another book that I would love to have in my library, but the time is not right for shopping.
Em qui., 30 de mai. de 2024 ¨¤s 00:56, Spehro Pefhany via <speff= [email protected]> escreveu:
At 07:27 PM 2024-05-29, you wrote:
Greetings everyone, I need a 741
model or it could be another op amp that has offset correction pins, the
need for these pins is because I'm making some circuits for teaching
purposes, such as the full wave rectifier precision, these circuits are
didactic and reinforcement in nature.
grateful
--
Carlos Delfino
Quem sou:?
Keybase (PGP):
ORCID:?
You can just add the two pins to a transistor-level model of the LM741.
If you can't find a decent transistor-level SPICE model, Sedra/Smith has
one in Chapter 10 of?
SPICE for for Microelectronic circuits, 3rd edition
You would connect the tops of the two 1k resistors R1 and R2 in Fig. 10.1
As others have said, using the offset null pins tends to introduce
excessive temperature dependence.
Best regards,
Spehro Pefhany
|
Re: Model for a Type D Flip Flop
On 31/05/2024 22:12, gioffantasy@... wrote:
Hi
again, i tried the library 74LVC1G, so I downloaded the .lib file
and the symbols from:
/g/LTspice/files/z_groups.io/Files%20sorted%20by%20message%20number/msg_128609/74LVC1G.lib
/g/LTspice/files/z_yahoo/Lib/Digital%2074LVC1Gxxx/74LVC1G.zip
I dont know if they are correct, because both files are in
diferent directories (z_yahoo and z_groups).
The thing is that I can run the flipflop "74LVC1G175" with no
errors, but the symbol has 2 pins with no labes, so I dont know if
they are VCC and GND, or what?
I let those pins unnconected and set .param VCC = 3.3 and include
the libray .inc 74LVC1G.lib.
The problem is that the Q output has the same response that CLK.
If CLK goes H, Q goes H. if CLK goes L, Q goes L.?
D is a constant 3.3V so Q should be equal to D all the time, and
only be updated on rise of CLK if D change. ~CLR is on HIGH all
the time.
I'm doing something wrong with this library??
As Andy suggested, the two "unlabelled pins should be connected to
"real" power and GND nodes. You might notice that there is a
downwards arrow in the lead to the top pin. This was meant to convey
it's a DC connection, but maybe it's not so obvious.
The reason for the making the power pins visible and necessary is
because these parts generate considerable current pulses on the
supply pins due to shoot-through conduction on the output stage. For
anyone that wants to model the effects of this on power supply
decoupling, it could be useful.
You might like to peruse the example in this
folder. It's a test circuit for the 74LVC1G86, but it's a
useful example for all the parts in the library. I do have test
circuits for all the parts in the library, but didn't feel it
necessary to upload all of them.
If you have a problem using the library after studying the example,
please report back, and I'll try to assist.
For some background notes on the model library, please open the
library file 74LVC1G.lib in LTspice or a text editor (but don't
change anything).
--
Regards,
Tony
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Re: opamp with offset pins
If it is just for didactic purposes, just add the resisters externally to the inputs.? For extra credit, buffer them with a common base stage.
Hyu wrote, "I think that PSpice has the LM741 with the offset null pins (1 and 5).?"
I guess you would need to install PSpice to get that model.
That reddit page is somewhat confusing.? The Netlist code below the picture shows that the two LM741's have only 5 pins, not 7, so they did not include the offset pins.? It's not clear what is going on.
I've checked T.I.'s LM741 SPICE (PSpice) models, and theirs do not have the offset pins.? In fact I think they do not have that portion of the on-chip circuitry at all, so you can't just dig into the model and find the two resistors where the pins would go.? They are not there at all in the SPICE model (from T.I.).? That's not saying that ALL (LM)741 models from T.I. are like that.? Sometimes T.I. has several web pages for minor versions of the same basic part, some with and some without SPICE models.
Andy
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Re: Model for a Type D Flip Flop
gioffantasy wrote, "I dont know if they are correct, because both files are in diferent directories (z_yahoo and z_groups)."
I think Tony is the expert on those.? But looking at them right now:
The two unlabeled pins on the symbol are for VCC (top pin, closer to the D input) and VGND (bottom pin, closer to MR input).? They should be connected to power and ground.? Not connecting them would be wrong.
The pins agree between the symbol file (under z_yahoo) and the model lib file (under z_groups.io).? So I think the symbols and .lib file can be used together.
Andy
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Re: opamp with offset pins
Hyu wrote, "I think that PSpice has the LM741 with the offset null pins (1 and 5).?"
I guess you would need to install PSpice to get that model.
That reddit page is somewhat confusing.? The Netlist code below the picture shows that the two LM741's have only 5 pins, not 7, so they did not include the offset pins.? It's not clear what is going on.
I've checked T.I.'s LM741 SPICE (PSpice) models, and theirs do not have the offset pins.? In fact I think they do not have that portion of the on-chip circuitry at all, so you can't just dig into the model and find the two resistors where the pins would go.? They are not there at all in the SPICE model (from T.I.).? That's not saying that ALL (LM)741 models from T.I. are like that.? Sometimes T.I. has several web pages for minor versions of the same basic part, some with and some without SPICE models.
Andy
|
Re: opamp with offset pins
Hello Carlos.
I think that PSpice has the LM741 with the offset null pins (1 and 5).?
In this link you can see it:
Hyu
On Friday, May 31, 2024 at 12:51:05 AM GMT-3, Carlos Delfino <consultoria@...> wrote:
Here's another book that I would love to have in my library, but the time is not right for shopping.
Em qui., 30 de mai. de 2024 ¨¤s 00:56, Spehro Pefhany via <speff= [email protected]> escreveu:
At 07:27 PM 2024-05-29, you wrote:
Greetings everyone, I need a 741
model or it could be another op amp that has offset correction pins, the
need for these pins is because I'm making some circuits for teaching
purposes, such as the full wave rectifier precision, these circuits are
didactic and reinforcement in nature.
grateful
--
Carlos Delfino
Quem sou:?
Keybase (PGP):
ORCID:?
You can just add the two pins to a transistor-level model of the LM741.
If you can't find a decent transistor-level SPICE model, Sedra/Smith has
one in Chapter 10 of?
SPICE for for Microelectronic circuits, 3rd edition
You would connect the tops of the two 1k resistors R1 and R2 in Fig. 10.1
As others have said, using the offset null pins tends to introduce
excessive temperature dependence.
Best regards,
Spehro Pefhany
|
Re: Model for a Type D Flip Flop
Hi again, i tried the library 74LVC1G, so I downloaded the .lib file and the symbols from:
/g/LTspice/files/z_groups.io/Files%20sorted%20by%20message%20number/msg_128609/74LVC1G.lib
/g/LTspice/files/z_yahoo/Lib/Digital%2074LVC1Gxxx/74LVC1G.zip
I dont know if they are correct, because both files are in diferent directories (z_yahoo and z_groups).
The thing is that I can run the flipflop "74LVC1G175" with no errors, but the symbol has 2 pins with no labes, so I dont know if they are VCC and GND, or what?
I let those pins unnconected and set .param VCC = 3.3 and include the libray .inc 74LVC1G.lib.
The problem is that the Q output has the same response that CLK. If CLK goes H, Q goes H. if CLK goes L, Q goes L.?
D is a constant 3.3V so Q should be equal to D all the time, and only be updated on rise of CLK if D change. ~CLR is on HIGH all the time.
I'm doing something wrong with this library??
|
Webinar and video "LTspice 24: Faster, Better, Easier Circuit Simulation"
I received a notice in my email about an upcoming webinar from Analog Devices titled " LTspice? 24: Faster, Better, Easier Circuit Simulation".? The date of the webinar will be the 19th of June, 2024. There is a video with exactly the same title, " LTspice? 24: Faster, Better, Easier Circuit Simulation", released a week ago on the 24th of May. My first thought was that the webinar would be the video.? (Not surprising; some webinars are pre-recorded.)? But no.? The presenters are not the same, and the pre-recorded video is quite short at less than 2 minutes.? Perhaps it was meant to be a "teaser" for the webinar. On the other hand -- the description for the webinar suggests that it is not about LTspice!? Perhaps either the description or the title is wrong. Short video:
Recorded May 24, 2024
Presenter: Christian Westpfahl, Field Application Engineer, Analog Devices
Only 1 minute 35 seconds long
Future webinar:
(link to event.on24.com not shown here, in case it is region-specific)
Wednesday, June 19, 2024
Presenter: Benjamin Voegeli, Senior Principal Engineer, LTspice Tool Development, Analog Devices
Unknown length (probably about 1 hour)
Description accompanying the video:?
LTspice is a powerful, fast and free SPICE simulator, schematic capture and waveform viewer with a vast and growing model library. Currently, these libraries contain over 30,000 models, including over 5000 ADI product models and example circuits. LTspice¡¯s waveform viewer allows you to probe schematics to display simulation results. LTspice 24 is a major upgrade released this year, running simulations faster than earlier versions. One significant new feature found in LTspice 24 is the addition of a FRA device, which can be used to perform frequency response analysis on non-linear circuits. This is particularly helpful in improving the loop stability and regulation speed of switch-mode DC-DC converters.
Description for the upcoming webinar:
In this webinar, find solutions for battery wear & tear, unnecessary power consumption, and over heating found in battery-powered applications and how supervisors optimize each circuit.
Attendees will Learn:
-
-
Common applications and challenges for battery-powered applications
-
Basic function, features and benefits of using supervisors
-
How to optimize battery-operated solutions using supervisors
As you can see, the description does not say anything about LTspice.? We will see if someone corrects it. Andy
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On Fri, May 31, 2024 at 07:57 AM, Robert Nickels wrote:
I came across this site for sharing LTSpice models: ?
It seems pretty dated but has a model I'd like to look at,? but I wasn't able to get the registration process to complete.???? Just wonder if anyone knows the status or has the ability to download a model for me?
Thanks and 73,
Bob W9RAN
Not all models on youspice.com are "free", so it would help to identify a specific model.
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I have gone to Youspice from time to time, but it is rather less useful than one might like.? The pop-up ads and on-screen ads are rather annoying.? If I remember correctly, many of the resources were locked, or required additional registration, or payment.? I think some of the articles led to models elsewhere (not at youspice.com itself), making them inaccessible.
When I registered for the site, more than a decade ago, it was challenging and took a few tries.? For logging in, the username might be case-sensitive.? That was unexpected.
Andy
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Great practical jokes, too. -marcel
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On 31/05/2024 16:57, Robert Nickels wrote:
I came across
this site for sharing LTSpice models: ?
It seems pretty dated but has a model I'd like to look at,? but I
wasn't able to get the registration process to complete.???? Just
wonder if anyone knows the status or has the ability to download a
model for me?
What model are you interested in? This is a pretty good site for
sharing models too.
--
Regards,
Tony
|
eewiz
Tony Casey
Roy McCammon