Sizing apparatus for active devices of integrated circuits and s

Details Sizing apparatus for active devices of integrated circuits and s Sizing apparatus for active devices of integrated circuits and s

1996-03-14

1998-06-09

Trans, Vincent N.

Boots, shoes, and leggings

364489, G06F 1750

Patent

active

057645310

ABSTRACT:
A sizing apparatus for active devices of an integrated circuit has a storage unit for storing information about connections between the active devices and a delay constraint, a size initializing unit for initializing a size of the active device to a minimum value, an electric current consumption change rate arithmetic unit for calculating a change rate of an electric current or power consumption when the size is increased, a delay calculating unit for calculating a maximum signal delay by analyzing a timing on the basis of the connecting formation, a delay constraint judging unit for judging whether or not a maximum signal delay satisfies the delay constraint, a critical path extracting unit for extracting a critical path from paths that do not satisfy the delay constraint, a delay improvement arithmetic unit for calculating an improvement rate of the signal delay of the critical path with respect to a variation quantity of the electric current or power consumption when increasing the size of the active device, a selecting unit for selecting the active device having the maximum improvement rate and a control unit for selecting a minimum change rate of the electric current or power consumption and making the delay calculating unit calculate a signal delay when increasing the size of the active device in accordance with the selected change rate.

REFERENCES:
patent: 4698760 (1987-10-01), Lembach et al.
patent: 4827428 (1989-05-01), Dunlop et al.
patent: 5392221 (1995-02-01), Donath et al.
patent: 5459673 (1995-10-01), Carmean et al.
patent: 5619418 (1997-04-01), Blaauw et al.

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