Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-04-18
2009-11-10
Mottola, Steven J (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S283000
Reexamination Certificate
active
07616059
ABSTRACT:
The invention relates to an differential amplifier circuit comprising an amplifier stage comprising a first and a second transistor, the gates of which are connected to differential input terminals of the amplifier stage. The differential amplifier further comprises a temperature compensation circuit comprising a third and fourth transistor. The third transistor is connected to the source of the first transistor and the fourth transistor is connected to the source of the second transistor. Further, the temperature compensation circuit comprises a constant current source connected to the respective sources of the third and fourth transistors. Thereby the temperature compensation circuit is arranged to provide a feedback resistance in dependence on the operating temperature so as to compensate for variations of the resistance of the first and second transistors.
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Veeravalli, A., et al. “Transconductance Amplifier Structures With Very Small Transconductances: A Comparative Design Approach.”IEEE Journal of Solid-State Circuits. vol. 37. No. 6. Jun. 2002. 770-775. (6 Pages).
Korotkov, A., et al. “A 2.5-V, 0.35 μm CMOS transconductance-capacitor filter with enhanced linearity.” The 2002 45th Midwest Symposium on Circuits and Systems. Tulsa, IEEE 2002. 141-144. (4 Pages).
Grewing Christian
Theil Detlev
Van Waasen Stefan
Infineon - Technologies AG
Maginot Moore & Beck
Mottola Steven J
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