Lookahead adder

Details Lookahead adder Lookahead adder

1990-07-18

1992-11-24

Malzahn, David H.

Boots, shoes, and leggings

G06F 752

Patent

active

051668998

ABSTRACT:
In a lookahead adder of the type wherein carry signals for successive stages of the adder are derived by a pyramid of hierarchically-arranged logic circuits, supplemented by carry signals from intermediate ones of the adder stages. The need to rely on such intermediate carry signals is dispensed with by additional non-hierarchically-arranged logic circuits whose outputs provide the information previously derived from intermediate carry outputs.

REFERENCES:
patent: 3805045 (1974-04-01), Larson
patent: 4764886 (1988-08-01), Yano
patent: 4858168 (1989-08-01), Hwang
patent: 5047974 (1991-09-01), Young
Schmookler et al, "Group-Carry Generator" IBM Tech. Disclosure Bulletin vol. 6 No. 1 Jun. '63 pp. 77-78.
"Pipelined Carry-Lookahead Adder for Fixed-Point Arithmetic" IBM Tech. Disclosure Bulletin vol. 28 No. 9 Feb. '86 pp. 4106-4108.

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