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    Why MOSFET IS OPERATED in Saturation region.................

    Why MOSFET IS OPERATED in Saturation region in most of the analog applications? please explain with some references..

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  2. #2
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    Why MOSFET IS OPERATED in Saturation region.................

    At the low-current end(weak inversion),
    we do not want to use
    the weak-inversion current
    region either. The absolute values of the currents and of the transconductances become so small
    that the noise becomes exceedingly large. Moreover, only low speeds can be obtained.

    At velocity saturation region:
    gm(sat) does not depend any
    more on VGS either. It has
    become a constant. This is
    why this region is never used
    by analog designers. The
    transconductance does not
    increase any more but the
    current consumption does!!



    This is why the highest
    values of VGS used are the
    ones in the middle current
    region, close to the velocity
    saturation region.


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