Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-02-14
2006-02-14
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S540000, C327S541000, C323S313000
Reexamination Certificate
active
06998902
ABSTRACT:
A bandgap reference voltage circuit includes a constant-current circuit, a reference voltage output circuit generating a reference voltage according to the constant current, a power supply voltage detection circuit, and a start-up output circuit. The start-up output circuit supplies a starting potential to the constant-current circuit until the power supply voltage detection circuit detects that the power supply has reached a voltage sufficient for the constant-current circuit to maintain operation. The power supply voltage detection circuit has elements analogous to the elements in the constant-current circuit that determine this voltage, so start-up operation can occur and end reliably. The start-up output circuit includes a low-impedance path from the power supply to a node controlling supply of the starting potential, so power-supply noise does not trigger unwanted output of the starting potential after start-up operation has ended.
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Cunningham Terry D.
Oki Electric Industry Co. Ltd.
Volentine Francos & Whitt PLLC
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