Wat is this inverter called?

Discussion in 'Homework Help' started by zenov, Mar 24, 2008.

  1. zenov

    Thread Starter New Member

    Mar 24, 2008
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    0
    hi, wld appreciate if someone can tell me the name of this circuit. i'm investigating the DC characteristics, wat elements am i missing in there? is the VTC supposed to look like that of a CMOS inverter?

    thanx ;)

    [​IMG]
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    You have an odd looking Mosfet symbol. A battery with an arrow pointing in the wrong direction.

    If both Mosfets are the same then they are not complementary like in a Cmos inverter.

    It looks like you have a current-source at the top that feeds a Mosfet inverting transistor at the bottom.
     
  3. Dave

    Retired Moderator

    Nov 17, 2003
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    It's a ratioed logic inverter. M1 is always on (although it should switch of as Vout gets close to Vdd). When Vin is high, Vout is pulled down to GND and there is a current path from Vdd to GND through M1 and M2. When Vin is low, M2 is off and Vout is pulled up to Vdd.

    It is very like pseudo-nMOS where the pulll-up transistor is a pMOSFET with the gate to GND.

    Dave
     
  4. zenov

    Thread Starter New Member

    Mar 24, 2008
    2
    0
    wow! thanx for pointing out the mistake in my diagram, and thanx for explaining :)
     
  5. Dave

    Retired Moderator

    Nov 17, 2003
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    There is no mistake in your diagram, it is just a particular arrangement of inverter using nMOS transistors.

    Dave
     
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