Solid state isolation device using opto-isolators

Details Solid state isolation device using opto-isolators Solid state isolation device using opto-isolators

1991-10-10

1993-09-14

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379379, 379399, 379345, 359189, H02H 322

Patent

active

052456544

ABSTRACT:
An isolation circuit (20) that is devoid of coupling transformers and yet suitable for use as a telephone line interface. The circuit is characterized by very wide bandwidth, low noise, and high linearity. Opto-isolators couple analog transmit and receive channels in a user device (12) across an isolation barrier (57) to a line pair for full duplex communication on the line pair. The interface circuit, which also includes a hybrid (55), includes first and second oppositely directed linear optocouplers (50,52). The first is disposed between the transmit channel and the hybrid; the second between the receive channel and the hybrid.

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