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unbiased transistor leakage analysis

Discussion in 'General Electronics' started by Fred Chen, Aug 28, 2004.

  1. Fred Chen

    Fred Chen Guest

    Does anyone know of where one can get unbiased (i.e., objective)
    transistor leakage power figures for the various CPU processors? I
    have checked various benchmarking web sites, but sometimes it is hard
    to get the feel that it is not subjective.

    Also is there any detailed analysis available of the electric field
    associated with the leakage current?

    Much appreciated,
    Fred
     
  2. Robert Baer

    Robert Baer Guest

    Transistor leakage is measured in microamps, not in watts.
    CPUs have millions of transistors, in various states depending on
    operations (if any) being done.
    CPU power requirements can vary widely, depending on the program or
    instruction mix.
    One "benchmark" can be "tuned" tomake a CPU look better than a
    (horrors!) competitors.
    And benchmarks are rarely representative of actual useage by "the
    average user", what ever "average" means...
     
  3. Fred Chen

    Fred Chen Guest

    Yeah, I was afraid of that.

    I have read that tunneling thru the gate dielectric is now the
    dominant factor in the leakage current. So I wanted to find out more
    about the electric field associated with this current.
     
  4. Robert Baer

    Robert Baer Guest

    AFAIK, that tunneling is most dominate in the (latest) dinky
    geometries, and we may not see CPUs based on the latest and "greatest"
    dinky geometries for a few years.
    Maybe we will be lucky in that the manufacturers will learn that the
    resulting excessive power drain cannot be tolerated in light of the
    green movement (and laws) by various government organizations,
    especially being compounded by their propensity to increase the number
    of transistors by such large amounts...
    ....furthermore, the equipment costs seem to go up by the cube (or more?)
    of the inverse of linewidth (in the billions now).
     
  5. Fred Chen

    Fred Chen Guest

    With oxide thickness ~ 1 nm, tunneling has to be an issue. The
    wave-function of the electron or hole should be important at this
    scale.

    I don't have any "real" numbers on the actual current magnitude, but
    if leakage is something like 100 nA/transistor, and there are a 100
    million transistors, operating at 1V, that is 10 W of power
    dissipation right there.
     
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