Binary-number comparator

Details Binary-number comparator Binary-number comparator

2006-03-21

2006-03-21

Ngo, Chuong D. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C340S146200

Reexamination Certificate

active

07016931

ABSTRACT:
A comparator for comparing binary numbers with N bits, where N>1, in which a plurality (200) of bit-to-bit comparators supplies a plurality of equality-difference signals, arranged in order of decreasing significance of the bits compared, to a matrix of transistors, arranged in 4 columns (201, 202, 203, 204) of N rows of transistors arranged in order, so as to control the gates of the transistors; the matrix, which receives, at the sources of the transistors of two (203, 204) of the columns, the signals representative of the bits of one of the numbers compared and their negated signals, is interconnected in a manner such as to identify the most significant difference by a simultaneous logic process, and to decide, on the basis of the bit signals received, which of the binary numbers is greater than, or greater than or equal to the other, presenting the outcome of the decision at an output (U2) within a very short time and with the use of much fewer active components than are required by conventional combinatory logic.

REFERENCES:
patent: 4648059 (1987-03-01), Gregorcyk
patent: 4685079 (1987-08-01), Armer
patent: 4933662 (1990-06-01), Szczepanek
patent: 5592142 (1997-01-01), Adams et al.
patent: 6177862 (2001-01-01), Sakata
patent: 0 390 454 (1990-10-01), None
European Search Report from European application No. 01830424, filed Jun. 22, 2001.

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