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VDMOS complete mathematical model including "mtriode" and "ksubthres" parameters

Patricio Cohen All Messages By This Member #81958 Hello all, I'm learning how to model MOSFETs using the VDMOS model. I have been reading a paper written by Hendrik, the author of the VDMOS tool, and helped a lot. However, I can't find how the mtriode and ksubthres parameters are used in the model.? I would really appreciate if someone can post the equations that are used in this model in terms of all its parameters. It would be fantastic to have them, so we can clearly see how the model behaves under certain conditions. Also, by having these equations it is possible to perform curve fitting using matlab or other similar tool. Thanks in advance, Patricio Cohen.
Александр Бордодынов All Messages By This Member #82018 Hello?Patricio Cohen. See?Research_of_model_Vdmos.zip in /Temp. I figured with two parameters of the model. But subthreshold mode current only partially. My approximation is close to the results of LTspice. For my surprise it turned out that the current change in podporoge in "e = 2.71828 ...." times observed when the voltage on deltaV = 2 * Ksubthres. I will continue to seek to approximate the subthreshold current equal to the results LTspice. Bordodynov. ?
Александр Бордодынов All Messages By This Member #82019 I am sorry. I used the Russian word "podporog" instead of the words subthreshold current. I would like to say that For my surprise it turned out that the subthreshold current change in "e = 2.71828 ...." times observed when the voltage on deltaV = 2Ksubthres. Bordodynov. 07.08.2015, 09:24, "BordodunovAlex@... [LTspice]" <LTspice@...>: toggle quoted message Show quoted text Hello?Patricio Cohen. See?Research_of_model_Vdmos.zip in /Temp. I figured with two parameters of the model. But subthreshold mode current only partially. My approximation is close to the results of LTspice. For my surprise it turned out that the current change in podporoge in "e = 2.71828 ...." times observed when the voltage on deltaV = 2 Ksubthres. I will continue to seek to approximate the subthreshold current equal to the results LTspice. Bordodynov.
@theeten2 All Messages By This Member #82020 Hello Bordodynov Your uploaded file Ksubthres.asc? has a typo and gives the following error message: .model test vdmos(rd=0 rs=0 vto=1 kp=1 ksubthres=0.1);--> * Unrecognized parameter "ksubthres" -- ignored Regards PhB
Александр Бордодынов All Messages By This Member #82021 Hello PhB. I considered everything correctly and no error messages, no. I'm using LTspice version 4.23e (Jul 28, 2015). Bordodynov. 07.08.2015, 09:41, "basier.philippe@... [LTspice]" <LTspice@...>: toggle quoted message Show quoted text Hello Bordodynov Your uploaded file Ksubthres.asc? has a typo and gives the following error message: .model test vdmos(rd=0 rs=0 vto=1 kp=1 ksubthres=0.1);--> * Unrecognized parameter "ksubthres" -- ignored Regards PhB
@theeten2 All Messages By This Member #82022 Hello Bordodynov You're allright with your version of LTspice. Earlier versions accepted only subthres parameter ( not ksubthres) but with bad results. By the way the help has not been corrected or updated. Curious........ Regards PhB
@theeten2 All Messages By This Member #82023 Hello Bordodynov You wrote: "I am sorry. I used the Russian word "podporog" instead of the words subthreshold current.? " No problem : that was clear :-) PhB
Patricio Cohen All Messages By This Member #82221 Thank you :)
[email protected] All Messages By This Member #103864 Hi, Andy: Thank you for the suggestion and file sharing at another recent thread "Re: Diode's Is vs. Ir (reverse current in datasheet)". Then I am trying to find those of MOSFET (VDMOS modeling), I found the URL?, I am not sure if it's enough for making a good VDMOS modeling (I don't know the paper mentioned by the owner Patricio of this thread, which it helps a lot in VDMOS), at least I found a question when I traced the parameter table step by step by searching the meaning in the material of the URL, it's the "Kp". For example, the "Kp"'s definition is "transconductance parameter" , but how can I find out a component's "transductance parameter" from the datasheet ? eg:??(the (infineon) CoolMOS Power transistor SPD06N80C3), I can't find any "transconductance parameter" in the datasheet. If anyone could suggest , the paper or guideline. Thank you very much Have a nice day! Best regards. ---In LTspice@..., <patricio.cohen@...> wrote : Hello all, I'm learning how to model MOSFETs using the VDMOS model. I have been reading a paper written by Hendrik, the author of the VDMOS tool, and helped a lot. However, I can't find how the mtriode and ksubthres parameters are used in the model.? I would really appreciate if someone can post the equations that are used in this model in terms of all its parameters. It would be fantastic to have them, so we can clearly see how the model behaves under certain conditions. Also, by having these equations it is possible to perform curve fitting using matlab or other similar tool. Thanks in advance, Patricio Cohen. ?

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