Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-09-19
2006-09-19
Van Nguyen, Khanh (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000, C330S311000
Reexamination Certificate
active
07109796
ABSTRACT:
The invention is directed to an amplifier circuit with adjustable gain which includes a plurality of parallel-connected differential amplifiers connected to a common cascode stage. An actuation unit is used to activate the differential amplifiers independently of one another on the basis of an applied control signal. The principle described makes it possible to dispense with inductances in the differential amplifier and hence to reduce unwanted crosstalk, while having a high linearity. Secondly, the amplifier's drawn current matches the respective output power which can be tapped off. Overall, the principle described is particularly suitable for use in UMTS mobile radios.
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Heigelmayer Bernhard
Pretl Harald
Eschweiler & Associates LLC
Infineon - Technologies AG
Nguyen Khanh Van
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