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Re: AD8336 failure
Tony Casey
--- In LTspice@..., "stm6823@..." <stevemorris@...> wrote:
Hello STM, It's possible I looked before the files were actually there, but when I found them they were in Files>Temp>AD8336, not Files>AD8336. It's also helpful when uploading files, to check the box about making an announcement to the group with a comment, not least because that message will have the correct hyperlink to the uploaded file because it's autogenerated and not prone to user error. I'm glad Helmut sorted you out, though, as he usually does when others fail. Regards, Tony |
Re: Simple model for diffin-diffout amp
ehydra
Indeed, and that is the reason why I just use the datasheet and the universalopamp symbol to get rid of the problems. Most times the universalopamp makes a better job.
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- Henry -- ehydra.dyndns.info RobertTalty schrieb: The Microchip opamp spic models are very complex and attempt to model all types of errors and their Temp variations, but in the end these models cause convergence problems, so what is the point of a complex model that causes beginners convergence problems. Convergence can be hard for experienced spice users to solve, so it is the last thing that beginners need. |
Re: AD8336 failure
Tony,
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Thanks for answering. I thought FILES\AD8336 in my help request would indicate where all the files were. Is there another way I should have done it? STM --- In LTspice@..., "Tony Casey" <tony@...> wrote:
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Re: adding noise to the model of a sensor
--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
Thank you, noisegen.asc + noisegen.asy is what I needed! Ruggero |
Re: About impedance
Dear Helmut,
? Thank you very much for your quick response. Yes, I was doing .AC simulation. ? Sincerely, ? Mahmudul Kabir, Japan? --- In LTspice@..., Mahmudul Kabir <nilonjana@...> wrote: Hello Mahmudul Kabir, I assume you use .AC simulation. In this case you can plot in Cartesian format which shows the real part with a solid line and the imaginary part with a dashed line. Best regards, Helmut [Non-text portions of this message have been removed] |
Re: Hey i am working on a Class D amp project, need help about LT Spice
John Woodgate
In message <j4sde1+lkfq@...>, dated Thu, 15 Sep 2011, cukkacan <mustafa_cukka@...> writes:
Hey, i am sophomore at the university, and i have a circuit sketch and data sheet. However, i dont know how to use LT Spice effectively. i couldnt build the circuit on LT Spice perfectly. Could you help me about this issue ?Study the examples and tutorials available on the list's web site. Read the Help. Upload your non-working schematic to the web site Files -> Temp and tell us you've done it. This list is not a general design help list. A web search for 'Class D' will provide you with hundreds of good hits (and some bad ones, but you can't win them all). -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK When I point to a star, please look at the star, not my finger. The star will be more interesting. |
Re: About impedance
--- In LTspice@..., Mahmudul Kabir <nilonjana@...> wrote:
Hello Mahmudul Kabir, I assume you use .AC simulation. In this case you can plot in Cartesian format which shows the real part with a solid line and the imaginary part with a dashed line. Best regards, Helmut |
Re: adding noise to the model of a sensor
--- In LTspice@..., "rug_rossi" <rrossi@...> wrote:
Hello Ruggero, The 1/f noise is implemented in diodes. Thus diode noise may be the natural choice for an 1/f noise source. Files > Tut > noisegen Files > Tut > noisegen_with_subcircuits Files > Tut > new_diode_noise.asc You already mentioned the "universalopamp". It contains parameters en and enk to set noise value and corner frequency. Best regards, Helmut |
About impedance
Dear Members,
? Is there any chance to calculate of real or imaginary part of impedance while doing a simulation?with any AC voltage? ? Or is it possible to draw?a trace of real part or imaginary part of impedace in LTspice? ? Thank you in advance, ? Mahmudul Kabir, Japan ? [Non-text portions of this message have been removed] |
Re: AD8336 failure
--- In LTspice@..., "stm6823@..." <stevemorris@...> wrote:
Hello STM, I have corrected your symbol and the schematic. It has been also necessary to add some convergence help. It has required the critical option .options cshunt=1e-15 I have uploaded a working example. Files > Temp > AD8336 > AD8336_1.zip. Best regards, Helmut |
adding noise to the model of a sensor
I need to add a noise generator to the model of a sensor (simply a behavioral source), in order to perform some noise analysis.
Noise is described by a noise density and a 1/f corner. which is the best way to do that? Add to my model a voltage follower made with the Universal OP amp level 1, or there is a better way? best regards, Ruggero Rossi |
Hey i am working on a Class D amp project, need help about LT Spice
cukkacan
Hey, i am sophomore at the university, and i have a circuit sketch and data sheet. However, i dont know how to use LT Spice effectively. i couldnt build the circuit on LT Spice perfectly. Could you help me about this issue ?
Also, advices about Class D amp are welcome. i need a working class-d amp circuit about 10-20W.i have checked on the web, topics are not live. |
Re: Implementing BSS138 spice model
--- In LTspice@..., "pindsen" <windven@...> wrote:
Hello Carsten, 4a) Ctrl-right-mouse-click on the placed symbol nmos. Change Prefix:MN to Prefix:X 2) I always recommend to save model files in the folder of the schematic. Best regards, Helmut |
Implementing BSS138 spice model
Hi,
I need an BSS138 in my LTSpice simulation. Since I can't find that component in the program itself, I need to make it. I have done the following steps but LTspice won't simulate: 1) Downloaded a Zetex BSS138 spice subcircuit and placed it in a "BSS138.sub" file 2) The spice file is placed in c:\program files\LTC\LTspiceIV\lib\sub 3) Included a nmos symbol (nmos.asy) in the design 4) Renamed the symbol to BSS138/ZTX 5) Add a spice directive command ".inc BSS138.sub" 6) Hit the run button 7) LTspice can't simulate and says "Can't find definition of model "bss138". The Zetex spice model can be seen here: *ZETEX BSS138 Spice Mosfet Subcircuit Last revision 11/91 * .SUBCKT BSS138/ZTX 3 4 5 * Nodes D G S M1 3 2 5 5 MOD1 RG 4 2 343 RL 3 5 6E6 D1 5 3 DIODE1 .MODEL MOD1 NMOS VTO=1.109 RS=1.474 RD=1.59 IS=1E-15 KP=0.597 +CGSO=23.5P CGDO=4.5P CBD=53.5P PB=1 LAMBDA=267E-6 .MODEL DIODE1 D IS=1.254E-13 N=1.0207 RS=0.222 .ENDS Can anyone help? Best regards Carsten Wind Denmark |
Re: General SPICE environment setup
Dear Sir,
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Will you please tell us how to do it? There might be cases when it is not such a bad idea. Best Regards E.A.Neonakis --- In LTspice@..., "analogspiceman" <analogspiceman@...> wrote:
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Re: What changes would make LTspice better?
martin562284
--- In LTspice@..., "Tony Casey" <tony@...> wrote:
Incidentally, the registry hack method works for almost any kind of file association, and can usefully be employed to invoke the a native Linux PDF reader, for example, from within many Windows applications (running in wine) that can call PDF files, instead of using a Windows version installed in the same wine bottle.Thanks for that, although I use the Linux version of the Adobe reader for viewing PDFs. and LTspice is now the only Windows app that I use on a regular basis. However, I'd like to try it on .net, .cir and .log files - I don't like the appearance of Notepad (purely a personal thing) so I'll try setting up an association to use the native editor of my choice. Cheers, Martin |
Re: General SPICE environment setup
Jim Wagner
On Sep 14, 2011, at 10:24 PM, martin562284 wrote:
I really do agree with Martin. The simple idea that one way fits all is simply not productive. Many of us have different styles of file management. The idea that our user environment must be exactly that which facilitates sharing over the internet is constraining. And, it is really at odds with the idea of giving the user many ways to hang him or her self. If we need to share a design, then why not a "share design" or "export" menu item that packages all of the needed files together and zips them in an appropriate hierarchy of folders (and adjusts directive-based model references)? The inclusion of a "project file" that references all of the project files would make file management quite straight forward. I am really quite surprised that such a strategy has not been adopted. It need not get in the way of using legacy netlists or model files. After all, virtually every software development environment allows inclusion of library files of all sorts. LTspice need not be any different! Jim Wagner Oregon Research Electronics [Non-text portions of this message have been removed] |
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