I happened to come across a link the other day to
, which some people here might
recognise as the website of Jim Thompson, a long-time contributor to
this group and many others. Sadly, the website has been taken down.
Some people might remember a while ago Jim mentioning that he was
ill, but fighting back, #105957. That was a while back - there have
been no messages since June. I'm inclined to fear the worst.
I never met, nor can pretend to have been a friend of Jim, or even
directly corresponded, but as one of almost the same vintage, I
developed a respect for his work over the years. I cut my teeth back
in the '70s and '80s developing RF and microwave frequency
synthesisers and the like, often with the help of chips that Jim had
designed during his time with Motorola, when they were ascendant:
classics including the MC1648, MC1658, MC12040 and MC4044.
These designs, of course, pre-date SPICE itself.
If anyone in this group has further information they are able to
offer, that would be appreciated, especially if it's along the lines
of Mark Twain's famous quote.
Regards,
Tony
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Eric wrote, asking Bordodynov, "I'm still trying to figure though how to download the ZZZ symbols file?"
That's inside his "lib.zip" file.? The ZZZ symbol folders are inside it.? The file is 12MB, but most of that is not the symbols.
Regards, Andy
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Eric wrote, "When I click the link you gave below it seems there is error now downloading files from yahoo."
Yahoo was wonky today.? It seems to be better now.
By the way, in case you have not discovered this yet -- when you see a link (in an email or elsewhere) to a file in a Yahoo!Group, you can't right-click on the link to download it directly.? You have to first go to that link (left-click on it), then you can download.? Also be careful not to let it sit too long before starting to download, because the URLs "time out" and become stale after several minutes.? And there are times when Yahoo just doesn't work right at all.
Regards, Andy
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Hi Andy,
Thank you again for your support. I haven't gotten to the file yet but I have found another part I can use 74hc595 with both asy and subckt files. I tried to abort? my request but you guys are just? very quick to respond.? When I click the link you gave below it seems there is error now downloading files from yahoo. But i'm ok already with the 74hc595..
Thanks also for your advise to check on the Group files. I think I missed to continue searching down for more files when I got too excited.
Best regards, Eric
?
Eric asked about the file "74hc_v.lib", needed in a downloaded simulation.
I don't know if you found the answer to your question already (the replies I received might not be in order).? However, the file you were looking for is in the group's Files, here:
? ? Files > Lib > Digital 74HCxxx > 74HC_v.lib
? ?
I remind people to try the "Table of Contents" file (all_files.htm) when something like this is needed.
By the way -- the schematic uses the 74HC194 but not the original/bipolar 74194, despite the name of the schematic.? I guess that schematic was an answer to someone's question and you'd have to go back to that question (99370) if you wanted to see why the names didn't agree.
Regards,
Andy
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Hi Bordodynov, Thank you for your help. I went to your ltwiki link. It's mind boggling the volume of work you have done. Thanks for sharing to us. Some of the parts were in my wish list. I'm still trying to figure though how to download the ZZZ symbols file?
Thanks and best regards, Eric
?
Hi Eric. I opened your circuit and everything was modeled. I just did: .tran 0 10m 0 uic I have installed libraries in ../Documenty/LTspiceXVII/ .. You can find it on my page: ? Bordodynov
?
Hi Helmut, Do you happen to have still the "74hc_v.lib file" used in the "74194 test.asc" schematic? It is not inside the zip file so I could not load it into the "sub" directory. The schematic would not run and is looking for it. I tried working through your instruction how to convert a .asc file into .lib but was too heavy for me. I reloaded the file dated Nov 19, 2016 for reference. I wrote an ealier email but seems did not go thru. Thanks and best regards, Eric ? ? ? ? ? ? ? ? ? ? ? ?
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madehakamal1996 wrote:
? ? "I actually found this spice model? ? ? ?... ? ? ?but it doesn't work."
In what way does it not work?
Are you asking this question because you don't know how to use a SPICE model?? Did you know what to do with that model, how to use it?? Did you assume that it's broken because you didn't know what to do with it?? Or did you use it (correctly) but the simulation didn't show you the result you expected, and what result would that be?? Or did your computer grind to a halt?
Regards, Andy
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Hello,
There is a model of the 1N4733 on page 36 in this presentation for students.
.MODEL 1N4733 D(IS=7.03E-16 RS=0.871 TT=5.01E-8 CJO=1.89E-10 VJ=0.75 M=0.33 BV=5.059 IBV=0.049 Vpk=5.1 mfg=Fairchild type=zener)
Best regards, Helmut
|
'Doesn't work' doesn't tell us anything we can
use to help you. Upload the .ASC that doesn't work to Files
=> Temp and send a message to say you did that.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
Rayleigh, Essex UK
toggle quoted message
Show quoted text
?
I actually found this spice model?
.model D1N4733 D(Is=1.214f Rs=1.078 Ikf=0
N=1 Xti=3 Eg=1.11
+ Cjo=185p M=.3509 Vj=.75 Fc=.5 Isr=2.601n
Nr=2 Bv=5.1 Ibv=.70507
+ Nbv=.74348 Ibvl=4.8274m Nbvl=6.7393
Tbv1=176.471u)
but it doesn't work.
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Hi. *SRC=1N4733A;1N4733A;Diodes;Zener <=10V; 5.10V ?1.00W ? Diodes Inc. Zener .SUBCKT 1N4733A ?1 2 * ? ? ? ?Terminals ? ?A ? K D1 1 2 DF DZ 3 1 DR VZ 2 3 3.69 .MODEL DF D ( IS=80.8p RS=0.620 N=1.10 CJO=189p VJ=0.750 M=0.330 TT=50.1n ) .MODEL DR D ( IS=16.2f RS=0.296 N=1.87 ) .ENDS ? Bordodynov.
27.11.2018, 20:24, "John Woodgate jmw@... [LTspice]" :
?
A simple web search gives at least two hits
for a spice model.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
Rayleigh, Essex UK
?
Hello,
? ? ? ? ?I need a spice model of 1N4733A zener diode.
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Re: Trying to create a lookup table without any success
There seems no need for the 100 V source,
still less the 10 ohm load, and your .TRAN command makes no
sense, since nothing varies, and the 1ps max time step is just
bizarre.? You can't specify the output of a B source in the way
you have written it, and in fact I don't think it will do what
you want anyway. However, what you want isn't at all clear. What
do you want the look-up table for?
You wrote: 'I wish it will take
the voltage and the output of V1' . The output of V1 IS 'that
voltage', so it's impossible to tell what you meant to do.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
Rayleigh, Essex UK
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Show quoted text
?
Hello,
I am trying to generate a value from a lookup table
but unfortunately I am doing something wrong and ltspice
complains. I have a V1 voltage that generates constantly
100V and I use a behavioral voltage source that I wish
it will take the voltage and the output of V1 and by
going through a table it will return a value. Any ideas
about that?
Thansk in advance!
|
Re: Trying to create a lookup table without any success
Hello,
Example:
V-source V1 connected between net "abc" and net "GND".
V1 abc 0 SINE(....)
Bv-source
V=table(V(abc), -100,20, -50, 15, 0, 5, 50, 20, 100, 30)
LTspice will use linear interpolation between the table-values.
Best regards, Helmut
|
I actually found this spice model?
.model D1N4733 D(Is=1.214f Rs=1.078 Ikf=0 N=1 Xti=3 Eg=1.11
+ Cjo=185p M=.3509 Vj=.75 Fc=.5 Isr=2.601n Nr=2 Bv=5.1 Ibv=.70507
+ Nbv=.74348 Ibvl=4.8274m Nbvl=6.7393 Tbv1=176.471u)
but it doesn't work.
|
A simple web search gives at least two hits
for a spice model.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates
Rayleigh, Essex UK
toggle quoted message
Show quoted text
?
Hello,
? ? ? ? ?I need a spice model of 1N4733A zener diode.
|
Re: FFT in LTspice Mac version
Hello,
> Do you know if there are ways to fix this bug?
Yes, convince the developer to fix it. :-)
Therefore write a bug report to LTspice@....
You could additionally ask this question on the official forum of Analog Devices.
Best regards, Helmut
|
Trying to create a lookup table without any success
Hello,
I am trying to generate a value from a lookup table but unfortunately I am doing something wrong and ltspice complains. I have a V1 voltage that generates constantly 100V and I use a behavioral voltage source that I wish it will take the voltage and the output of V1 and by going through a table it will return a value. Any ideas about that?
Thansk in advance!
|
Re: FFT in LTspice Mac version
I have the same problem with fft on macOS Mojave 10.14.1
Do you know if there are ways to fix this bug??
|
Model for F0800LC180 PUK diode
I am looking for a model for that diode or the way to obtain it. I like that diode because its price is not so high and reach 775A averaged and 1800V. The specs can be found here, appear the Trr that is important in the design of a high power rectifier:
?
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Re: Saving and restoring inductor current
>? ?A smarter way around this problem might be to select the test?> frequency points and cycles used such that the test and? > switching frequencies are always related to each other? > by whole numbers ratios (for the parametric output plot,? > there is no need that frequency points be evenly spaced).
I've experimented with an injected signal which contains the sum of all test frequencies one wants to inspect. It is then easy to? sync?to the switching frequency. The FFT of the output directly? correlates to the amplitude Bode diagram (to get the phase is a bit more work). It appears to work, but I've had no time to analyze it in depth yet.?
For the experiment I used an?experimental SPICE?that? accepts a fixed timestep.
-marcel
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Re: Saving and restoring inductor current
Hello Alexander,
Your English has improved noticeably over the years.
My great-grandfather was third generation Russian whose father became an American when Alaska was purchased.? His great-grandfather migrated to Russia from Germany and was the captain of the first ship when the Russians explored and colonized Alaska.? My great-grandfather died before I was born, but his wife (who was half Danish and half Japanese) lived well into her nineties.? She died when I was a young man in university, so she was a favorite grandmother to me when I was a boy.
She taught me a few Russian phrases and I grew up eating pickled herring (the creamy kind), borscht, black caviar, black tea from a large samovar, yeast-dough piroshki, and praniki (hard, flat, white mint flavored cookies) as well as many other Russian foods without names to me (such as pickled onions, beets and cabbage).? It makes my mouth water thinking about them.? Of course I learned to like many Japanese foods as well.
---In LTspice@..., <BordodunovAlex@...> wrote : Hello analogspiceman. ? Thank you for enlightening me. I added the following to my collection of models: ? .subckt Lrememb 1 2? .param ? L=1 Rser=1m Rpar=1/Gmin ic=0 C1 3 0 {L} Rser={1/Rpar} Rpar={1/Rser} ic={ic} G1 1 2 3 0 1 G2 3 0 2 1 1 .ends Lrememb ? Bordodynov.
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Re: Saving and restoring inductor current
Hello Vlad and Alexander (and Helmut, who is always such a gentleman expert),
Thanks for noticing.? The things that interest me most about LTspice are always so arcane and often not of interest to most users so it is nice when some of the more sophisticated group members take notice (kind of like the situation with Adrian Immler and his amazing, improved tube models).
I haven't tried it yet, but thought this "dual inductor" would be useful in a improved version of LTspice's example file transient domain loop-gain analyzer that uses .measurement statements because it could perhaps save a lot of time lost recalculating steady state at each new frequency step of the analysis.
In his Ridley Works software (was Power 4-5-6), Ray Ridley uses a seemingly improved variation of the post processing loop-gain analyzer technique for switching circuits (his Excel engine generates a LTspice version of the subject schematic).? His software requires 32 bit Excel and all my machines are 64 bit, so I haven't been able to try his free, limited, but complete example (for buck converters only).? Thus I haven't been able to examine exactly what his software does to determine if it has improved upon the standard methods that are used in the LTspice example file.
If you can, please try out his free software and report back what you think of it.? It also generates superb, elegant and efficient LTspice models for winding and core loss (something I have done on a case by case basis as needed, but his software has generalized automated method of doing so).? We could probably duplicate his methods.
The transient domain loop-gain analyzer essentially performs a discrete Fourier transform at each analysis frequency point.? This can be problematic with much injected fractional cycle noise if the switching frequency and the test frequency do not both end on exactly whole periods.? The usual solution to this problem is to apply a complicated and computationally expensive tapered windowing function to minimize the deleterious effects of fractional alignment.? A smarter way around this problem might be to select the test frequency points and cycles used such that the test and switching frequencies are always related to each other by whole numbers ratios (for the parametric output plot, there is no need that frequency points be evenly spaced).
My goal is to create a transient domain frequency response analyzer for switching power supplies in LTspice that produces as clean and noise-free results as does SIMPLIS while still running reasonably quickly.
---In LTspice@..., <imbvlad@...> wrote : Hello analogspiceman
LTspice can save and restore node voltages, but not branch currents. This means that by using ".savebias time=<tstop>" and ".loadbias" a simulation with inductors is only partially saved and restored because inductor currents are ignored. It occurred to me that by making a "dual inductor" using current sources and a capacitor, one might trick LTspice into saving "inductor" currents. The inductor dual is very simple and can be a subcircuit with the inductor symbol edited to represent the dual inductor with the expected symbol.
Don't how this compares speed-wise and coupled inductors would require an extension, but this technique might prove useful in certain stepped simulations that could run much quicker if the operating point did not need to be refound each time.
That's a nice trick, thank you. The penalty shouldn't be that much if not too many inductors are used, for example a SMPS could really use that. Even filters that are not too large could benefit from this.? Coupled inductors might be trickier to set up, though. -- Vlad
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Tony Casey
John Woodgate