Hi Andy, I'm able to download it now. The circuit works already. I also learn something else which is the word wonky:) Thanks and best regards, Eric
?
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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Anyone working with class D amplifiers or audio ADCs/DACs needs to be
mindful of excluding sampling artefacts from their audio measurements.
Audio Precision include an AES17-20k recommendation brick wall filter in
their esteemed test equipment. You can buy modules on eBay that say they
do the same.
In the pretend world of simulation, the same requirements apply
regarding noise and distortion measurements. I have uploaded a model of
an AES17-20k filter that meets all the requirements of the 20kHz brick
wall filter:
Insertion loss at 20kHz: < 0.1dB
Rejection at 22kHz: > 20dB
Rejection from 25kHz to 10MHz: >65dB
The upload contains model, symbol and test schematic.
Files > Examples > Apps > AES17-20k.zip
Regards,
Tony
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I have worried about Jim Thompson.? A month or so ago I even did a web search, just to see if his life status had changed -- fortunately found nothing.? Maybe he is in treatment or recovery and just not able to maintain things on the web at the moment.? I hope he will be back.
He has many accomplishments.? Like you, I used some of the ICs he designed.
Regards,
Andy
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Re: Trying to create a lookup table without any success
evangelos.liakos, I strongly recommend NOT labeling the ground net "N".? It already has a label, which it gets from the "ground" symbol, and LTspice needs to use that label, not yours.? Don't try to attach another net name to the ground net or any other net that is already named.? ?Especially, don't try to use that other net name in an expression.? LTspice will discard your added label.? Fortunately, LTspice was able to modify your "V(Cb,N)" expression to "V(Cb,0)", so that expression did the right thing.
Please read how Tables are supposed to be used.? See this Help page: ? ? Help > LTspice > Circuit Elements > B. Arbitrary Behavioral Voltage or Current Sources
Scroll down that page until you reach "table".? The word "table" must be part of the expression.? You forgot that.? I think that was the biggest mistake.
Table() is a function.? The first parameter is where you would put "V(Cb)" (there's no need to write "V(Cb,0)" but you could).? Therefore, in your schematic you should right-click on your B1 source and change the Value line to this: ? ? V=table( V(Cb),
Change the Value2 line to this: ? ? (0,3000), (50,650), (100,490), (150,400), (200,350), (250,400), (300,300), (400,250), (500,220), (600,215), (700,210), (800,210), (900,210), (1000,210) )
Note that I've added a comma between each pair of values (I guess it's necessary), and one more close-parenthesis at the end so that the parentheses are balanced.
FYI, the schematic you uploaded was "Draft3.asc".? In the future, please choose a better filename than that, when you upload something -- the filename should mean something helpful.? Also, please upload to the "Temp" folder only.? To do that, navigate to the Temp folder first, and only then, click the Upload button. There are many examples of Tables in our group's Files section.
As John already posted, other parts of your schematic don't make any sense; but I'm guessing you just threw this together to demonstrate Tables without trying to make it "do" anything.? Also there is a missing ground on the right half of the schematic.? B1/R3 should be grounded.
I'll upload a corrected schematic (Draft3_Lookup_Tables_fixed.asc).
Regards, Andy
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All,
Try this link if you want to capture any of his website:
As Tony mentioned, I used a lot of the I.C.'s that he had developed over the decades.
Jay www.analogdesign.com
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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
|
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
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'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
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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!
|
Tony Casey
Jay Philippbar
John Woodgate