Digital signal comparator for comparing n-bit binary signals

Details Digital signal comparator for comparing n-bit binary signals Digital signal comparator for comparing n-bit binary signals

1991-08-29

1993-06-15

Malzahn, David H.

Communications: electrical

Digital comparator systems

G06F 702, G06F 704

Patent

active

052203069

ABSTRACT:
A digital value comparator circuit for comparing in magnitude first and second digital values, each represented by n-bit binary signal (n is an integer larger than 1) is disclosed to comprise first and second signal converters for receiving the first and second digital signals, each converter including a parallel connection of first to n-th FETs with powers, respectively, m.sup.0, m.sup.1, m.sup.2, m.sup.3, . . . , m.sup.n-1 times (m is an integer larger than 1) of a predetermined power and having respective gates connected to the n bits of the supplied digital signal sequentially from its least significant bit, and an adder circuit for generating an output signal indicative of a sum of currents flowing through drain-source circuits of the first to n-th FETs, and a decision circuit connected to the first and second signal converters for comparing the output signals thereof and generating a signal representing the result of comparison.

REFERENCES:
patent: 3508198 (1967-06-01), Coombs, Jr. et al.
patent: 3601801 (1971-08-01), Sauvan
patent: 3836908 (1974-09-01), Hegendorfer
patent: 4017830 (1977-04-01), Shigemori et al.
patent: 4031511 (1977-06-01), Britton
patent: 4109141 (1978-08-01), Sasaki
patent: 4891534 (1990-01-01), Kanoh
Gautier et al., "Two-Bit Words Comparison Circuit" IBM Tech. Disclosure Bulletin vol. 18, No. 8 Jan. 1976 pp. 2544-2545.
Texas Instruments, Advanced Bipolar Logic Family Data Book pp. 4-658 to 4-665, 1990.

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