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 Why is E-Mosfet Not Going into Saturation With Drain Current? 

Last post Mon, Dec 3 2012 2:09 AM by oldmouldy. 1 replies.
Started by Shiraz 01 Dec 2012 07:23 AM. Topic has 1 replies and 615 views
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  • Sat, Dec 1 2012 7:23 AM

    • Shiraz
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    • Joined on Sun, Sep 23 2012
    • Posts 15
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    Why is E-Mosfet Not Going into Saturation With Drain Current? Reply

    Ok I am assuming that if you force an appropriate drain current into an e-mosfet it should go into saturation (Vgs becomes greater than Vt ).

    Here is the simple archived project : https://docs.google.com/open?id=0BwG45lg3wcwnU3ZDQ3NtNjZCM2s

    If I force a drain current into an n channel mosfet which forces the mosfet into saturation I should NOT have to bias the mosfet further right ? YET I have to do this here where I supply a dc voltage and get an n channel mosfet into the saturation region (I have to figure out the bias voltage by observing the VTC traits (Vds vs Vgs graph)).

    Then I give the right dc voltage to bias the amplifier in the right region. I am fairly new to CS amplifiers but my professor was surprised that it needed a bias voltage AND an active load.

     p.s. the above project  :  Project_Working with 1000 Gain-Nov-30-2012.zip is a file that has the original circuit which gives an input signal of 1mv(peak) an amplification of 1000 (to bring it around 1V(peak)).

    • Post Points: 20
  • Mon, Dec 3 2012 2:09 AM

    • oldmouldy
    • Top 10 Contributor
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    • Woking, Surrey
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    Re: Why is E-Mosfet Not Going into Saturation With Drain Current? Reply
    A MOSFET with a Vgs of 0 of not going to conduct worth a light. I doubt that the Saturation current of a Power MOSFET is going to be in the order of uA. See if that helps.
    • Post Points: 5
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Started by Shiraz at 01 Dec 2012 07:23 AM. Topic has 1 replies.