Solid state isolation device using opto-isolators

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

H - Electricity

02

H

H02H 3/22 (2006.01) H04M 7/00 (2006.01)

Patent

CA 2119751

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.

L'invention concerne un circuit d'isolation (20) qui est dépourvu de transformateur de couplage mais est cependant approprié à être utilisé comme interface de ligne téléphonique. Le circuit se caractérise par une largeur de bande très grande, un faible bruit, et une grande linéarité. Des opto-isolateurs permettent le couplage de canaux analogiques de transmission et de réception dans un dispositif utilisateur (12) sur une barrière d'isolation (57) à une paire de lignes pour assurer une communication en duplex intégral sur la paire de lignes. Le circuit d'interface, qui comprend également un hybride (55), comprend des premier et second optocoupleurs linéaires de sens opposé (50, 52). Le premier optocoupleur est disposé entre le canal de transmission et l'hybride; le second optocoupleur est disposé entre le canal de réception et l'hybride.

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