Help Please: MOSFET SWITCH Lumped Element Model

Discussion in 'General Electronics Chat' started by Management, May 28, 2009.

  1. Management

    Thread Starter Active Member

    Sep 18, 2007
    306
    0
    Can someone help me with a lumped element model of a N-Channel Depletion Mode MOSFET? One that doesn't have the body diodes in it (being used as a switch).

    If someone can post the schematic or a drawing it would be greatly appreciated.

    I found this one and I guess I can just remove the diodes. I would be shorting the body to the source.
    [​IMG]

    I know all the values, can calculate them, but I don't know how to use the Idrain in the model. That would have to be set to an equation for drain current (depletion equation)? If so, how do I do that in spice, i.e. make that a voltage controlled current source?

    Any help would be appreciated!
     
  2. Management

    Thread Starter Active Member

    Sep 18, 2007
    306
    0
    Any ideas on this?

    I want to use GPOLY for the Voltage Controlled Current Source (VCCS). Anyone have any idea on exactly how to input that polynomial and.or in what form? Would it just be an Id = equation?

    Some help on this would be greatly appreciated.
     
    Last edited: Jun 3, 2009
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