Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-09-05
2006-09-05
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C327S359000
Reexamination Certificate
active
07102435
ABSTRACT:
An amplifier arrangement and also a control loop having the amplifier arrangement are specified, wherein the amplifier arrangement is based on a Gilbert multiplier. Connected in parallel in this case with one of the transistors of the differential amplifier cells is an additional transistor, at which it is possible to tap off a signal that is proportional to the gain factor. Processing this signal in a suitable manner, for example in a control loop, makes it possible to compensate for temperature and manufacturing fluctuations and also to obtain a highly linear characteristic curve having a gain factor which can be set in a stable manner. In addition, the structure shown is current-saving and can be used, in particular, for application in radio frequency technology as an amplifier having a variable gain factor (VGA).
REFERENCES:
patent: 6316996 (2001-11-01), Puotiniemi
patent: 6657494 (2003-12-01), Twomey
patent: 61033006 (1986-02-01), None
“Bipolar and MOS Analog Integrated Circuit Design”, A. Grebene, ISBN 0-471-08529-4, Figure 8.36, p. 446.
Bosch Martin
Traub Johann
Eschweiler & Associates LLC
Infineon - Technologies AG
Mottola Steven J.
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