Opto-coupling device between a modem and a telephone line

Details Opto-coupling device between a modem and a telephone line Opto-coupling device between a modem and a telephone line

1994-03-15

1996-01-02

Hofsass, Jeffery A.

Telephonic communications

Subscriber line or transmission line interface

379405, H04M 100

Patent

active

054816068

ABSTRACT:
An opto-coupling device lies between an analog input circuit, such as a telephone line, and a processing apparatus, such as a modem. The device has a high impedance circuit; this is, its impedance is high with respect to the input impedance of the analog input circuit. This high impedance circuit has a voltage/current conversion circuit. The variations of the current flowing through the conversion circuit are directly induced by the variations in the voltage of the analog input signal. The high impedance circuit is in series with a constant current source, and is connected to the analog input circuit. The inputs of the opto-coupling device are in parallel with the voltage/current conversion circuit.

REFERENCES:
patent: 5245654 (1993-09-01), Wilkison et al.

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