Isolation amplifier with hook switch control

Details Isolation amplifier with hook switch control Isolation amplifier with hook switch control

1997-06-12

1999-08-31

Vo, Nguyen

Telephonic communications

Subscriber line or transmission line interface

379 561, 379379, H04M 100, H04M 1100

Patent

active

059463945

ABSTRACT:
An isolation amplifier circuit with hook switch control includes first and second amplifier stages optically isolated from and coupled to each other. A biasing circuit is optically coupled to the amplifier to provide a switchable prebias to the amplifier to allow the amplifier to process bipolar voltage input signals. A hook switch circuit is coupled to the biasing circuit such that as the bias condition is switched, the hook switch is opened or closed. The same optical coupling circuitry can be used to couple the first and second amplifier stages and to couple the biasing circuit to the hook switch circuit such that savings in circuit space and cost are realized.

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Bob Krause, "Designing Linear Amplifiers Using the IL300 Optocoupler Appnote 50", Siemens Application Note, 1995, pp. 11-163 --11-179.

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