A method for optimal driver selection uses a cost function that is based on
the non-linear delay characteristics and the stage gain of the candidate
drivers. The cost function operates to select an optimal driver for
driving the predetermined capacitive load which simultaneously minimizes
the delay and the amount of input capacitance introduced. In one
embodiment, a method for selecting a driver for driving a load capacitance
from a group of drivers includes: computing for each driver a cost based
on a cost function associated with the driver, and selecting the driver
having the smallest cost. The cost function is directly proportional to a
delay of the driver and inversely proportional to the logarithm of a stage
gain of the driver. In another embodiment, the stage gain is an output
capacitance driven by the driver (the load capacitance) divided by an
input capacitance of the driver.
