Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-03-15
2005-03-15
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S543000
Reexamination Certificate
active
06867640
ABSTRACT:
An integrated overvoltage and reverse voltage protection circuit that includes two p-channel double-sided extended drain transistors coupled to a high voltage source, each having their n-well coupled through a resistor to the high voltage source. For voltage regulation, a voltage divider is coupled in series with a first of these transistors, while the drain of the second transistor is coupled to the gate of the first transistor. For voltage blocking, the voltage divider may span the entire supply voltage. An n-channel transistor couples the second p-channel transistor to a low voltage source. A middle node in the voltage divider is coupled to one input of a comparator, with a reference voltage coupled to the second input. The comparator output drives the gate terminal of the n-channel transistor. A load to be protected may be disposed in parallel with the voltage divider.
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Laraia J. Marcos
Scott Greg
AMI Semiconductor Inc.
Tra Quan
Workman Nydegger
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