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Can I determine Vth for a MOSFET from a Curve Tracer? - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


mmaassel
Post subject: Can I determine Vth for a MOSFET from a Curve Tracer? Posted: Thu Feb 05, 2009 11:13 am

Colonel


Joined: Mon Apr 10, 2006 12:43 pm
Posts: 25
Good day. This might be a very simple question but I am stuck.

I have setup a curve tracer simulation within SPICE (LTSPICE from Linear Technology). I am just using the generic MOSFET model that comes with LTSPICE.

How can I determine the threshold voltage from the output of the curve tracer?

LTSPICE does allow me to export the data from the curve tracer plot into a form that I can import into an Excel Spreadsheet.

Any suggestions and/or reference material would be greatly appreciated.

Michael


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IR
Post subject: Re: Can I determine Vth for a MOSFET from a Curve Tracer?Posted: Thu Feb 12, 2009 3:59 pm

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello Michael,

I don't use this kind of Spice. But in general I would say that for MOSFET (Depletion or Enhancement), Vth is the point at which the current starts to ramp up rapidly.

Here is a picture to demonstrate:

http://en.wikipedia.org/wiki/File:IvsV_mosfet.png

Hope this helps!

_________________
Best regards,

- IR


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mmaassel
Post subject: Re: Can I determine Vth for a MOSFET from a Curve Tracer?Posted: Fri Feb 13, 2009 10:56 am

Colonel


Joined: Mon Apr 10, 2006 12:43 pm
Posts: 25
Good day IR.

Thank you very much for the answer and the link.

Michael








Posted  11/12/2012
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