Fail-safe digital comparator

Details Fail-safe digital comparator Fail-safe digital comparator

1980-05-23

1982-05-04

Malzahn, David H.

Communications: electrical

Digital comparator systems

G06F 704

Patent

active

043285414

ABSTRACT:
A digital comparator with a comparison cell for each pair of digits of two words stored in separate register banks. Each corresponding pair of register stages is coupled to the associated comparator cell by a rectifier interface network which supplies an actuating signal only when the associated word digits have complementary characteristics. The comparator cells are coupled in series and interfaced to input and output by optical coupler units. Each cell includes an LC network tuned to the selected frequency of an input test signal which is passed through the comparator chain, from highest to lowest order cells, only if each cell is actuated by an input signal from the associated interface network, thus indicating that each pair of word digits is complementary.

REFERENCES:
patent: 3508198 (1970-04-01), Coombs, Jr. et al.
patent: 3517175 (1970-06-01), Williams
patent: 3983329 (1976-09-01), Rock
patent: 3995173 (1976-11-01), Sibley
patent: 4012714 (1977-03-01), Lohmann
patent: 4017830 (1977-04-01), Shigemori et al.
patent: 4079272 (1978-03-01), Howatt
patent: 4179629 (1979-12-01), Sahasrabudhe et al.

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