Amplifiers – With amplifier condition indicating or testing means
Reexamination Certificate
2007-01-11
2009-02-10
Mottola, Steven J (Department: 2817)
Amplifiers
With amplifier condition indicating or testing means
C330S254000, C330S256000
Reexamination Certificate
active
07489186
ABSTRACT:
A current sense amplifier for a voltage converter wherein the voltage converter has at least one channel providing an output current through an output inductor, the current sense amplifier monitoring the current in the at least one channel through the output inductor, the current sense amplifier comprising a plurality of variable gain amplifiers, there being at least one more variable gain amplifier than channels in the voltage converter, whereby at least one variable gain amplifier is in a calibration mode for a preset period of time during which the variable gain amplifier is compensated for an offset error and the gain of the variable gain amplifier is calibrated to compensate for temperature of the output inductor, while during said preset period of time any remaining variable gain amplifiers are connected to monitor the channel current in each output inductor.
REFERENCES:
patent: 6894464 (2005-05-01), Zhang
patent: 2006/0001408 (2006-01-01), Southwell et al.
patent: 2007/0064456 (2007-03-01), Schuellein
patent: WO 2005/031955 (2005-04-01), None
International Rectifier Corporation
Mottola Steven J
Ostrolenk Faber Gerb & Soffen, LLP
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