Standard cell design incorporating phase information

Details Standard cell design incorporating phase information Standard cell design incorporating phase information

2006-04-11

2006-04-11

Siek, Vuthe (Department: 2825)

Computer-aided design and analysis of circuits and semiconductor

Nanotechnology related integrated circuit design

C716S030000, C716S030000

Reexamination Certificate

active

07028285

ABSTRACT:
Phase information is incorporated into a cell-based design methodology. Standard cells have four edges: top, bottom, left, and right. The top and bottom edges have fixed phase shifters placed, e.g. 0. A given cell C will have a phase set created with two versions: 0-180 (left-right) as well as 180-0. Alternatively, the same phase set: 0—0 and 180—180 could be created for a cell. The phase sets are selected based on the ability to phase shift the features within the cell C. By creating a phase set for most of the cells of a cell library, standard cell placement and routing techniques can be used and phase can then be quickly assigned using a simple ripple technique. This ensures a phase compliant design upfront for the standard cell areas. In some instances, phase sets are created for every cell in a library

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