Communications: electrical – Digital comparator systems
Patent
1987-03-23
1989-03-14
Malzahn, David H.
Communications: electrical
Digital comparator systems
G06F 702
Patent
active
048128090
ABSTRACT:
A circuit checks for coincidence of a data word with a reference data word by means of EXOR gates per digit of the two data words, and a non-coincidence is permitted in a number of digits (m). The output signal that appears at the output of the circuit is the result of the current flowing therein, with the sign thereof being indicative of either a coincidence or a non-coincidence. For this purpose, the individual outputs of the EXOR gates serve to activate switch transistors with the aid of which standard currents (i) are caused to flow from the output, via an N-multiple current source, to the zero point of the circuit (ground). On the other hand, via a first P-current mirror, a current mi and, via a second P-current mirror, a current i/2 are fed to the output. By means of the N-multiple current source, the current mi is impressed upon the current input of the first P-current mirror.
REFERENCES:
patent: 3656109 (1972-04-01), Conway
patent: 3796868 (1974-03-01), Kavl et al.
patent: 3818348 (1974-06-01), Puente
patent: 4153946 (1979-05-01), Upton
patent: 4498141 (1985-02-01), Cooper
patent: 4694274 (1987-09-01), Shimada et al.
patent: 4752763 (1988-06-01), Hoffman
O'Leary Paul
Orben Hans-Josef
Deutsche ITT Industries GmbH
Malzahn David H.
Peterson Thomas L.
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