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PMOS vs NMOS size

Discussion in 'Electronic Basics' started by Gurjot Singh Bakhshi, Jul 8, 2004.

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  1. Someone told me in CMOS the size of the P-MOSFET is thrice the size of the NMOS.

    is it so? why?

    and what is thrice? the Lenght,Width or Area?
     
  2. Bob Myers

    Bob Myers Guest

    It's due to the lower (poorer) mobility of charge carriers
    in P-type material vs. N-type; N mobilities are generally
    more than twice that of P.
    There would be some impact in all areas, but generally
    it would be the "width" - if by that we're talking about
    the dimension primarily responsible for controlling the
    per-unit-length resistance. (In other words, "width"
    with respect to the direction of current flow, not
    necessarily the shorter of two dimensions of a given
    rectangle.)

    Bob M.
     
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