Fail-safe digital comparator

Details Fail-safe digital comparator Fail-safe digital comparator

G - Physics

06

F

354/24

G06F 7/04 (2006.01) G06F 7/02 (2006.01) H03K 19/007 (2006.01)

Patent

CA 1151770

(Case No. 7036) ABSTRACT OF THE DISCLOSURE 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 unite. 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.

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