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A Very Basic NMOS question

Discussion in 'Electronic Basics' started by Saran, Oct 8, 2004.

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  1. Saran

    Saran Guest

    Hello All,

    I am a computer science person. I am learning Analog VLSI. I have a
    basic question about MOSFETS. For instance, consider two NMOS
    transistors series connected. I have VDD = 5V, VG (dev1) = 3 =
    VG(dev2). Device two source is connected to ground.

    \(Vdd = 5V)
    |
    |------out1
    N1(gate vol=3v)
    |
    |------out2
    N2(gate vol = 3v)
    |
    |
    gnd

    If the nmos can be considered as a simple resistor with the
    appropriate voltages ensuring the conduction through the device, why
    is by out2 showing me zero (I am using cadence spectre for
    simulation). Should I not expect out2 current to be the drain current
    of N2?

    I am really sorry if this question is too basic for you. I have been
    scratching my head over this question for too much time now..I thought
    you people might help me out.

    Thanks,
    Saran
     
  2. Saran

    Saran Guest

    The problem was with spectre. To see the current at the source, I
    needed dummy voltage sources (0V) connected. Thanks.

    Saran
     
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