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inversion layer

Discussion in 'Electronic Basics' started by novice, Dec 21, 2005.

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  1. novice

    novice Guest

    what is an inversion layer? how it is caused?also what is body effect?
  2. Richard

    Richard Guest

    May be wrong group. There doesn't appear to be a group, so you
    may want ? You could also try Google.

    Effect on what?

  3. Ralph Mowery

    Ralph Mowery Guest

    It is a layer of air that is either warmer or colder than the layers above
    and below it. It will bend the radio waves. Also in the ocean water it is
    a layer of water that is warmer or colder than the water above and below it.
    The sonar used to search for submarines will bend and give a false
    indication of where the sub is if it even bounces off of it.
  4. Jasen Betts

    Jasen Betts Guest

    hot air trapped below cold air
    cold wind aproaching hot ground flowing over the top of hills for example.
    I think that's when air flows faster past an obstacle, but I'm not sure.
  5. Bob Monsen

    Bob Monsen Guest

  6. novice

    novice Guest

    i'm sorry i was talking about FET's not weather....
  7. Yes. Indeed you were. Quite frankly, I am somewhat amused at the
    responses to this question in this group.

    Oh...The "body effect" is noted by the change in threshold voltage that
    occurs when the backgate/substrate connection of the mos is connected to
    a lower potential then its source (nmos case).

    If the mos is an isolated structure, one can tie its local tank/well to
    its source. This minimises its Vt. If the structure is a non-isolated
    one, then this cant be done. In this case the effective Vt will be
    higher if the source is not at the substrate potential, e.g. in a nmos
    differential pair. Isolated mos use more area, so its a trade off as to
    how one designs the circuit. A higher Vt usually can result in less
    signal handling range.

    The weather over here (London) is a bit drizzly and cold today though.

    Kevin Aylward
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
  8. Tim Williams

    Tim Williams Guest



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