Encoder output error detecting circuit

Details Encoder output error detecting circuit Encoder output error detecting circuit

1986-04-14

1987-10-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356395, 340347P, G01D 5245

Patent

active

047000635

ABSTRACT:
An encoder having improved output abnormality detection. First and second input signals differing in phase from one another are compared by respective first and second comparators with a first reference level at an amplitude center of each of the first and second signals, and the outputs of the first and second comparators are applied to respective inputs of an EXCLUSIVE-OR gate. Third and fourth comparators compare a composite signal of the first and second signals with respective third and fourth reference levels located on opposite sides of the first reference level, and the output of the third and fourth comparators are applied to respective inputs of a first AND gate. A second AND gate, at the output of which the circuit output is provided, receives as inputs the output of the first AND gate and the output of the EXCLUSIVE-OR gate.

REFERENCES:
patent: 4021116 (1977-05-01), Martens
patent: 4491826 (1985-01-01), Krogh et al.
patent: 4551715 (1985-11-01), Durbin

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