The name is absent



exact value of the leakage current involves elaborate expressions. Since such an
exact leakage model does not affect our basic approach, we use following model
presented (n [60].

ʃɪeak = qie^L+^L2\                          (3.1)

Ileak is the leakage current of a transistor; q1, q2, and ⅛ are three constants
that are determined by physical characteristic of the transistor and
L is the
gate length of the transistor,
q3 is a small number and q3L2 q2L [60]. This
model suggests an exponential relation between the transistor gate length and
the leakage power. Thus, the leakage current approximately has a log-normal
distribution and
pu = φup‰ where pɑ and pu are nominal power and real power
of the gate, respectively, and
φu = e^“ ; where ≠u represent variation in transistor
dimension.

Thus, given a combinational circuit C consisting of N logical gates, Pj input
pins, and
Pq output pins, each gate gu, based on its inputs signals b, consumes a
specific power
pguj>∙ Because of the process variation, power consumption of gate
gu does not equal to its nominal power consumption pθj,. Rather, it is scaled by
Φu∙

Pgu,b = Pgu,bΦu

The scaling factors of gates, φu, need to be estimated, whenever it is feasible.

24



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