Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-09-19
2006-09-19
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S407000
Reexamination Certificate
active
07109783
ABSTRACT:
Method and apparatus for regulating voltage within an integrated circuit is described. For example, a voltage regulator receives a first reference voltage and produces a regulated voltage. A comparator includes a first input for receiving a second reference voltage and a second input for receiving the regulated voltage. The comparator includes an offset voltage. The comparator produces a control signal indicative of whether the difference between the second reference voltage and the regulated voltage is greater than a predetermined offset voltage. A clamp circuit clamps the regulated voltage to the second reference voltage in response to the control signal. In another example, the clamp circuit is removed and a multiplexer selects either a first reference voltage or a second reference voltage to be coupled to a voltage regulator. The multiplexer is controlled via output of a comparator that compares the first reference voltage and the second reference voltage.
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Costello Philip D.
Kondapalli Venu M.
Voogel Martin L.
Webostad W. Eric
Xilinx , Inc.
Zweizig Jeffrey
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