Appeal No. 1999-0259
Application 08/596,857
This is a decision on appeal under 35 U.S.C. § 134
from the final rejection of claims 1-3, 10, 13 and 16-18.
Claims 4-9, 14, and 15 stand objected to in the current appli-
cation. Claims 11 and 12 are allowed.
The instant invention relates to a method of
modeling a plurality of serially coupled circuit cells with a
distributed serial load. Appellants’ specification
(“specification”), page 1, lines 5-8. The distributed
serial load model is used in applications where the loading on
one cell, e.g. cell 12, is affected by output loading on
subsequent cells, e.g. cells 16, 18, and 20. Specification,
page 9, lines 14-17. Cells 16-20 affect the loading on cell
12 because the input and outputs of cells 16-20 are
transparent and unbuffered. Specification, page 9, lines
14-19. Since design rules do not require the input and output
of each cell to be buffered, the loading on the one cell is
affected by loading on the subsequent circuit cells, i.e.
downstream loading is conveyed back to the first cell.
Specification, page 10, lines 13-19. The effective load
impedance of the unbuffered cells cannot be accurately modeled
2
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