Amplifier having an output protection, in particular operational amplifier for audio application
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United States of America Patent
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Nov 2, 2010
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N/A
app pub date -
Apr 4, 2008
filing date -
Apr 6, 2007
priority date (Note) -
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Abstract
An amplifier with an output protection having an input stage defining a feedback node, an output stage connected to the feedback node and defining an output node supplying an output voltage, and a feedback stage connected between the output and the feedback nodes. A mirror stage is connected to the feedback node and has the same structure as the output stage, the mirror stage defining a reference node connected to the feedback stage for generating a reference voltage to be compared to the output voltage by the feedback stage. The feedback stage generates a current limitation signal fed to the feedback node when a difference between the output and the reference voltages is higher than a threshold.
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