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mos operation regions

Discussion in 'General Electronics Discussion' started by vead, May 24, 2014.

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  1. vead

    vead

    473
    14
    Nov 27, 2011
    there are three regions of operation in mos transistor
    1. cut off
    2. linear
    3.saturation

    consider cmos Inverter circuit
    Input is high -> output is low
    pmos in cut off -> nmos in linear

    Input is low -> output is high
    pmos in linear ->nmos in cut off

    I am having problem to understand last condition '' saturation "
    how transistor work in saturation work
     
  2. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    Saturation is when the transistor is turned fully on like a switch. The current through it is controlled by the external circuit.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    2,788
    Jan 21, 2010
    Where you write "linear" in your explanation of a mosfet, you really mean "saturation".

    The transistors in a digital circuit spend as little time as possible in the linear region, they are either on (saturated) or off (cutoff).
     
  4. vead

    vead

    473
    14
    Nov 27, 2011
    transistor are either on (saturated) or off (cutoff).

    so what happen when transistor in linear mode
    transistor will be on or off
     
  5. LvW

    LvW

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    146
    Apr 12, 2014
    I think, there are no "digital parts". Rather we have parts which mostly are operated between two extreme conditions ("digital") or any where in between.
    That means: We shouldn´t only distinguish between "on" and "off". A ggod example is the CMOS inverter which can be (and is in some applications) operated in a quasi-linear mode.
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    In a digital circuit this means it is actively switching (or it's being forced not to be digital as in the case mentioned by LvW above).
     
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