Mixed static and domino logic on the CMOS gate forest |
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Authors: | Kernhof J. Selzer M. Beunder M.A. Hoefflinger B. Laquai B. Schindler I. |
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Affiliation: | Inst. for Microelectron., Stuttgart; |
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Abstract: | In a semicustom design environment with unified transistor geometries, logic circuit optimization is achieved using an efficient physical circuit implementation. In particular, the semicustom realization of domino logic is demonstrated with a standard-cell and a multiplier design which are used to support the implementation of such a dynamic logic design style on a gate forest, which has a higher n count than p count. The mixture of complementary and dynamic logic allows the designer to improve the critical-path delay and to reduce the size of the layout. The domino standard-cell architecture supports multiple-output configurations and additional internal precharge. The operation time for a mixed static/dynamic multiplier is approximately 30% higher than that of the static version based on a carry select adder. This difference mainly affects the critical delay of the sign-extension path of the parallel adder array |
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