Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-04-05
2011-04-05
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000
Reexamination Certificate
active
07920026
ABSTRACT:
An output stage of an amplifier circuit includes one or more output transistors that are selectively driven by a boosted drive circuit, where the boosted drive circuit is arranged such that the output range of the amplifier circuit is increased while maintaining reduced quiescent current. The drive signal to each output transistor is selectively increased only when demanded by the output load conditions. The threshold for boosting the drive signal can be adjusted for optimized performance. In one example, a class AB output stage includes a separate drive boost circuit for each output transistor. For this example, each drive boost circuit has a separate threshold for boosting each of the drive signals to the output transistors. The boosting can also be adjusted to optimize the differential input stage and current mirror maximum current requirement while maintaining minimum required bias currents.
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National Semiconductor Corporation
Nguyen Khiem D
Pascal Robert
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