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Hello Helmut, S-parameters are a very useful representation of a given network. For a 1-port, they correspond to the voltage reflection coefficient, and they can therefore be displayed on the Smith

<colombobolo@h...> wrote: netlist Hello "bolocolombo", thanks for the S-parameter example. I tried it immediately and it seems to work. I have to admit that I have only a small idea about the

Hello Helmut. Thank you for your advice. I was able to modify the transistor models from the SPICE directive, or even better, by editing the model files for the NPNs. The .STEP is a good suggestion

<jgraham@...> Try these sites for more information: http://www.national.com/an/OA/OA-18.pdf http://www.national.com/an/AN/AN-856.pdf http://www.national.com/an/AN/AN-1255.pdf

Helmut you saved me again, thank you. Part of the confusion that I had was that I don't really know what the syntax should be. What I did was cut and pasted the example in the help file to my library

<bunnyblues2001@y...>" <bunnyblues2001@y...> wrote: Hello Bunny, the problem is that your model/subcircuit doesn't follow SPICE syntax. Your switch model in the library has to be only: .model CSWITCH1

Then it should have been able to include the file. Until the help documents the paths searched for .lib and .inc files. Until you get the problem figured out, you might just use absolute paths. --Mike

That was the first thing I checked. There's only one extention on the file. Does the rest of the code check out?

wrote: - - - > SNIP < - - - If anybody knows of more recent works than what I previously cited, I am definitely interested in learning about them!! I've been putting together an EXCEL spreadsheet that

<jgraham@o...> wrote: If you're employed as a design engineer, sometimes you can get a vendor to develop a model on request. Mere mortals have to use what's available on published data sheets and try

What's the best way of creating an opamp model if the manufacturer does not have a spice model for it? Thanx, -Jon

Is the file really called "MYLIBRARY1.LIB" or "MYLIBRARY1.LIB.txt"? I turn off "Hide file extension for known file types" in Explorer=>Tools=>Folder Options=>View "MYLIBRARY1.LIB" needs to be the full

OK where did I go wrong, I'm getting - Could not open include file "MYLIBRARY1.LIB" I copied the switch out of help, and the library is in the sub directory. MYLIBRARY1.lib *SYM=CSW .MODEL CSWITCH1 1

<colombobolo@h...> wrote: gate can where about Hello Bolo, I remember one method to do something like that. So at least the .STEP command allows access to the transistor's parameters. Example syntax:

I recently discovered LTSpice and I love the program. My question is the following: I wish to modify the model parameters of say, the NPN bipolar transistor, so as to see the impact of various

You can do this if the symbol is modeled with a subcircuit. It's described in one of the downloads of this group and now also in the help section Schematic Capture=>Creating New Symbols=>Adding

I need a method to bind schematics to cell and block symbols that uses the symbol attributes, so that instantiating and placing a symbol causes that symbol's definition to be included as a subcircuit

Spectrum Software (makers of MicroCap) has an application note concerning gas tubes at http://www.spectrum-soft.com/news/winter99/sparkgap.shtm While the syntax might be different from LTSpice, the

<rd.weaver@n...> wrote: wrote: used complex found problems beginning. Hello Russell and Mike, thanks for your advices to solve

Helmut, The tolerances that are typically most useful to loosen are abstol, vntol, and chgtol. If you loosen reltol, it's best not to loosed it too much. The "No Bypass" check box is also often an