o Temperature Inversion effect is seen at lower technology nodes (28nm and below), where cell delay is inversely proportional to the temperature. This is mainly because of reduced supply voltage at lower nodes.
o
Cell delay depends on carrier mobility and
threshold voltage of transistor. Both mobility and threshold voltage inversely
proportional to the temperature.
o
At higher nodes, due to high supply voltage,
effect of mobility is dominant over
threshold voltage on cell delay. So, As
temperature increases, mobility decreases
and cell delay increases.
o
While at lower nodes, as supply voltage is
reducing, effect of threshold voltage is dominant on cell delay compared to
mobility. So, As temperature increases,
threshold voltage decreases and cell
delay decreases
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