Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-11-06
2007-11-06
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S260000, C330S310000, C330S311000
Reexamination Certificate
active
11137237
ABSTRACT:
An amplifier arrangement is provided having a first differential amplifier stage and a second differential amplifier stage, which are connected to one another with negative feedback. The second differential amplifier stage has a first voltage divider that is connected to the controlled path of the second differential amplifier stage and has at least two signal taps. The second differential amplifier stage also has a second voltage divider with at least two signal taps. Furthermore, a switching device is provided, and is connected to the at least two signal taps of the first voltage divider and to the at least two signal taps of the second voltage divider. The switching device is used to connect one of the at least two signal taps of the first voltage divider to a first output tap of the amplifier arrangement, and one of the at least two signal taps of the second voltage divider to a second output tap of the amplifier arrangement. The overall input impedance can thus be adjusted in a suitable preferred manner.
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Pretl Harald
Stöger Claus
Eschweiter & Associates, LLC
Infineon - Technologies AG
Nguyen Patricia
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