Opto-isolator hybrid circuit

Details Opto-isolator hybrid circuit Opto-isolator hybrid circuit

1979-11-05

1982-01-26

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

250551, H04B 900

Patent

active

043132251

ABSTRACT:
The disclosed four-wire to two-wire converter employs a pair of dual detector opto-isolator circuits to both linearize the converter transfer characteristic and eliminate signal feedback between ports. This is accomplished by feeding back the signals transmitted by the transmit portion of the four-wire port through the auxiliary detector of the opto-isolator circuit connected across the two-wire port to prevent signal feedback to the receive portion of the four-wire port. This opto-isolator feedback arrangement eliminates the need for complex feedback and impedance matching circuitry thereby enabling direct connection of the opto-isolator circuits to the communication paths while also rendering the converter circuit transparent to signals appearing thereon.

REFERENCES:
patent: 3410961 (1968-11-01), Slana
patent: 4056719 (1977-11-01), Waabon
patent: 4087647 (1978-05-01), Embree et al.
Judo et al-Bidirectional Optical Isolator-IBM Tech. Discl. Bull.-vol. 22, #4, Sep. 1979, pp. 1671-1672.
Sager-DC Isolation for Bidirectional Signal Transmission Electronik, vol. 24, #12, p. 76, Dec. 1975.

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