Method and apparatus for output amplifier protection
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United States of America Patent
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May 18, 2010
Grant Date -
Feb 4, 2010
app pub date -
Aug 1, 2008
filing date -
Aug 1, 2008
priority date (Note) -
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Abstract
An amplifier circuit includes a first circuit and a second circuit connected in series. The first circuit has a first terminal coupled to a first power supply terminal, a second terminal coupled to an output node, and a control terminal for receiving a first signal for controlling a current flow. The second circuit has a first terminal coupled to the output node, a second terminal couple to a second power supply terminal, and a control terminal for receiving a second signal controlling a current flow in the first circuit. A bias circuit is coupled to the third terminal of the first circuit and is configured to limit a current flow in the first circuit when a voltage at the output node is outside a predetermined voltage range. In an embodiment, the bias circuit includes a plurality of diode devices connected in series and a switch device coupled to the diode devices.
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