Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-09-06
2005-09-06
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
C323S280000
Reexamination Certificate
active
06940336
ABSTRACT:
Voltage regulator with an output transistor MP1, including a first PMOS FET, whereby the input voltage Vdd of the voltage regulator is applied to the source of the output transistor MP1and where the drain of the output transistor MP1constitutes the output of the voltage regulator. The voltage regulator, furthermore, includes a regulation circuit1that may, for example, consist of an error amplifier and that controls the output transistor in such a way that the least possible deviations between the output voltage Vout and the target output voltage are allowed to occur. The voltage regulator includes a switch-on protection circuit that includes a second PMOS FET MP2,whereby the source of the second PMOS FET MP2is connected to the input voltage Vdd of the voltage regulator, the drain of the second PMOS FET MP2,by way of a pulldown resistor R3,to a reference potential Vss, and the gate of the second PMOS FET MP2to the reference potential Vss, and which furthermore includes a third PMOS FET MP3,where the source of the third PMOS FET MP3is connected to the input voltage Vdd of the voltage regulator, the drain of the third PMOS FET MP3is connected to the gate of the output transistor MP1, and the gate of the third PMOS FET MP3is connected to the drain of the second PMOS FET MP2.
REFERENCES:
patent: 6628489 (2003-09-01), Pardoen et al.
patent: 6801419 (2004-10-01), Fukui
Brady W. James
Swayze, Jr. W. Daniel
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
Tra Quan
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