Isolation amplifier with hook switch control
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United States of America Patent
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Aug 31, 1999
Grant Date -
N/A
app pub date -
Jun 12, 1997
filing date -
Jun 12, 1997
priority date (Note) -
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Importance
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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