NMOS Resistances

Discussion in 'Homework Help' started by ElectricMagician, Nov 12, 2013.

  1. ElectricMagician

    Thread Starter Member

    Jul 26, 2012
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    0
    Hello,

    I have two questions regarding the transistor in the attached figure,
    - Can we assume that R1 and R2 are equivalent?
    - Is their value calculated from KVL or through the Rout formula (I/λIDS)?

    Thank you!
     
  2. WBahn

    Moderator

    Mar 31, 2012
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    What would the basis be for saying they are equivalent?

    Perhaps the place to start would be to consider what, precisely, each of those parameters means.
     
  3. ElectricMagician

    Thread Starter Member

    Jul 26, 2012
    57
    0
    Hello WBahn,

    The problem just states R1 and R2, my only clue is that they represent Ron.
     
  4. WBahn

    Moderator

    Mar 31, 2012
    17,716
    4,788
    In general, when you have an R and an arrow like that, it is asking for the resistance as seen looking into that port. This usually means the incremental, or differential, resistance, which is

    R = dI/dV where I is the current into that port and V is the voltage at that port.
     
    anhnha likes this.
  5. ElectricMagician

    Thread Starter Member

    Jul 26, 2012
    57
    0
    Got it, thank you.
     
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