Loop current detector with threshold setting impedance

Details Loop current detector with threshold setting impedance Loop current detector with threshold setting impedance

1982-04-28

1984-06-12

Brown, Thomas W.

179 18FA, H04M 322

Patent

active

044544774

ABSTRACT:
In a loop circuit closure detector, a circuit which connects a voltage comparator to the loop circuit is biased so that the comparator indicates loop circuit closure at a predetermined minimum non-zero value of loop current. Comparator inputs are both coupled to supply voltage connections by approximately equal-attenuation paths and are both coupled to said loop circuit by approximately equal-attenuation paths.

REFERENCES:
patent: 3622709 (1971-11-01), Tjaden
patent: 3748395 (1973-07-01), Herter
patent: 3784756 (1974-01-01), Nemchik
patent: 4056688 (1977-11-01), Stiefel
patent: 4292473 (1981-09-01), Venken et al.
patent: 4315106 (1982-02-01), Chea, Jr.
patent: 4387273 (1983-06-01), Chea, Jr.
patent: 4406929 (1983-09-01), Pace et al.

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