Drain current of Depletion type MOSFET in two different regions

Discussion in 'Analog & Mixed-Signal Design' started by Babun Pal, Jul 20, 2016.

  1. Babun Pal

    Thread Starter New Member

    Jul 13, 2016
    14
    1
    Hi,

    I have a few doubts about depletion type MOSFET:


    1. The schematic symbol of Depletion type MOSFET and Deletion-Enhancement type MOSFET are the same. Therefore, if any one of them is used in a circuit schematic, how can we distinguish them?


    2. For Enhancement type MOSFET, the drain current in two different regions are:


    Triode region:

    upload_2016-7-20_15-51-22.png


    Saturation Region:

    upload_2016-7-20_15-51-1.png



    What are the drain current equations for a Depletion type MOSFET in saturation region and triode region?


    Would you be kind to clarify me the above two doubts?

    Thank you.
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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  3. crutschow

    Expert

    Mar 14, 2008
    13,016
    3,235
    You would have to look at the part number to determine whether the MOSFET is enhancement or depletion.

    I believe the equations are the same except Vth is opposite polarity for a depletion mode.
     
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