Is it possible in SPICE to create a MOSFET with user defined values of V_T(Threshold Voltage)?

This question cropped up because I was taking a course on Analog Design with videos & problem sets(without answers) available online.I got stuck in the problem sets and have no way to verify my answer and thought process.So I thought instead of shamelessly posting the question here, simulation of the circuit would solve the problem and increase my intuition & understanding.

But I discovered that only specific models from various Companies are available.

The only parameter I want to change is V_T?Is there any way to 'create' such a component and simulate it???

  • \$\begingroup\$ Usually on simulators you can open the model of a device and edit various parameters. I think Vgs might be what you are looking for. Maybe your version doesn't allow this? \$\endgroup\$
    – Andy aka
    Commented Jul 4, 2013 at 22:13
  • \$\begingroup\$ What SPICE and MOSFET? \$\endgroup\$
    – Matt Young
    Commented Jul 5, 2013 at 1:09
  • \$\begingroup\$ @MattYoung:LTSpice \$\endgroup\$ Commented Jul 5, 2013 at 5:17

1 Answer 1


If you have issue wrt LTSpice, you can post the question on LTSpice forum on Yahoo. Otherwise, take a MOSFET spice file in text format, create your own symbol in LTSpice and simulate. This particular method we exactly use when, expected components are not available in library.


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