Standard cell design incorporating phase information
US7028285B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2002 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Oct 16, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/70558
- WIPO fieldOptics
- WIPO sectorInstruments
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
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.