Interface for a telephone set

Details Interface for a telephone set Interface for a telephone set

1984-12-06

1986-12-02

Rubinson, Gene Z.

Telephonic communications

Substation or terminal circuitry

Impedance matching or line equalizing

379413, H04M 300

Patent

active

046266267

ABSTRACT:
An interface is arranged between an integrated circuit which is provided for a 5 volt supply voltage and a variable-voltage telephone line. This circuit employs an MOS transistor whose current is controlled by a current regulating transistor and a current measuring resistor and includes a negative voltage feedback path for alternating current. A time constant is provided in order to disable the action of the current regulating transistor for transient or alternating currents.

REFERENCES:
patent: 4079211 (1978-03-01), Janssen
patent: 4354060 (1982-10-01), Niertit et al.
patent: 4360710 (1982-11-01), Chaput et al.
patent: 4440979 (1984-04-01), McGibbon et al.

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