High-performance adder

Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed

Reexamination Certificate

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Reexamination Certificate

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09967240

ABSTRACT:
An adder for use in summing two binary numbers in an arithmetic logic unit of a processor. The adder includes a sparse carry-merge circuit adapted to generate a first predetermined number of carries and a plurality of intermediate carry generators coupled to the sparse carry merge circuit and adapted to generate a second predetermined number of carry signals. The adder further includes a plurality of conditional sum generators coupled to the intermediate carry generators and to the sparse carry-merge circuit to provide the sum of the two binary numbers. The adder may also include a multiplexer recovery circuit that enables a single rail dynamic implementation of the adder core.

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Cheng et al., the improvement of conditional sum adder for low power applications, 1998, IEEE, p. 131-134.
Jien-Chung Lo A fast bianry adder with conditional carry generation, Feb. 1997, IEEE Transactions on computers, vol. 46, No. 2, pp. 248-253.
Woo, R., et al., “A 670ps, 64bit Dynamic Low-Power Adder Design”,IEEE International Symposium on Crcuits and Systems, Geneva, Switzerland, pp. I-28-I31, (May 28-31, 2000).

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