Amplifiers – With semiconductor amplifying device – Including protection means
Reexamination Certificate
2008-04-04
2010-11-02
Mottola, Steven J (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including protection means
C330S290000
Reexamination Certificate
active
07825734
ABSTRACT:
An amplifier with an output protection having an input stage defining a feedback node, an output stage connected to the feedback node and defining an output node supplying an output voltage, and a feedback stage connected between the output and the feedback nodes. A mirror stage is connected to the feedback node and has the same structure as the output stage, the mirror stage defining a reference node connected to the feedback stage for generating a reference voltage to be compared to the output voltage by the feedback stage. The feedback stage generates a current limitation signal fed to the feedback node when a difference between the output and the reference voltages is higher than a threshold.
REFERENCES:
patent: 4714898 (1987-12-01), Botti et al.
patent: 5162749 (1992-11-01), Kobayashi
patent: 5739712 (1998-04-01), Fujii
patent: 5905617 (1999-05-01), Kawasoe
patent: 6218900 (2001-04-01), Nolan
European Search Report from corresponding European Application No. 07105835.8, filed Apr. 6, 2007; Date of Search Report Jul. 26, 2007.
Murin Peter
Saman Hynek
Jorgenson Lisa K.
Morris James H.
Mottola Steven J
STMicroelectronics Design and Application S.r.o.
Wolf Greenfield & Sacks P.C.
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