[sdiy] Problem with LTspice "Unkown VDMOS level: 3:

Harry Bissell hbissell at wowway.com
Sat Sep 24 05:32:13 CEST 2022

Thanks Andrew. 
I (probably) can do that but I’m trying to find the root cause.  The standard.mod files live in the same directory as the bipolar transistors, diodes, capacitors,etc. and they all work. This all “used” to work just fine. Even with a fresh download I can draw a new schematic using nmos and change the part number to whatever I like, but every one gets the same error message. Only on nmos and pmos. As if the program has forgotten how to interpret the level 3 model.

I think it must be “just me” as I find no one else mentioning the issue. I see the point of copying the model in the schematic but that is unnecessarily complicated for what are supposed to be simple models.

I just tried loading a .cir file and auto-generate a symbol. That works fine. I have hundreds of legacy schematics and I want to open them without too much rework.

Thanks for your help.

Sent from my iPhone

> On Sep 23, 2022, at 9:09 PM, Andrew Simper <andy at cytomic.com> wrote:
> Yep, sounds like a path issue, but you can just copy and paste the stuff from the file into a .model comment inside your document and it will work, and that way you can more quickly try out variations to the model, and also mismatch the model parameters by hand, which I find much quicker than messing around with lib files - and also it makes the doc portable so you can share it with anyone without them needing to setup the lib stuff properly.
> Andy
>> On Sat, 24 Sept 2022 at 04:36, Mr&MrsAccount <hbissell at wowway.com> wrote:
>> Hi All:
>> I've recently updated LTspice and have an issue with the nmos and pmos models. I can put them in a circuit and use either the default model or choose any other
>> model. When I run I get the error message listed above.
>> I tried the same with NPN and PNP model and it all worked out OK.
>> So I don't think it is a path problem etc.  I opened the lib\cmp\standard.mos file and all the model information is there.
>> Any ideas?   I'm not new to this but this one has me beat.
>> thanks
>> Harry
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