So, what is the condition on to satisfy this condition? Can be a constant as stated in assumption 1? To study this point let derive an expression for . Utilizing equation () yields

From the machine characteristic, equation (), it can be shown that

Substituting equation () into equation () yield,

It can be shown that equation () can be transformed into

According to the ``common'' model , and are independent of the gate area, . The term is not a constant and is a function of (possibility other parameters).

To maintain the mass balance must be a function at least of the gate area, . Since the ``common'' diagram assumes that is a constant it diametrically opposite the mass conservation principle. Moreover, in the ``common'' model, a major assumption is that the value of depends on the metal, therefore, the mass balance is probably never achieved in many cases. This violation demonstrates, once for all, that the ``common'' diagram is erroneous.

copyright Dec , 2006

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