Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-10-03
2006-10-03
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
C323S313000
Reexamination Certificate
active
07116158
ABSTRACT:
A bandgap reference circuit as may be used in ultra-low current applications is provided. An exemplary bandgap circuit can be configured to generate a positive temperature coefficient without the need for a resistor to offset a negative temperature coefficient. In accordance with an exemplary embodiment of the present invention, a bandgap circuit comprises a negative temperature coefficient generated from a junction device and a positive temperature coefficient generated from an FET-based device. An exemplary junction device can comprise a bipolar, junction diode or any other device for generating a negative temperature coefficient, while an exemplary FET-based device comprises a gate-drain connected device configured to provide a gate-source voltage having a positive temperature coefficient coupled in series with the bipolar device. In accordance with another exemplary embodiment, the bandgap circuit can be configured with a threshold voltage elimination device comprising a second FET-based device configured to subtract out a threshold voltage component of the first FET-based device.
REFERENCES:
patent: 5187395 (1993-02-01), Pirez
patent: 5451860 (1995-09-01), Khayat
patent: 6091286 (2000-07-01), Blauschild
patent: 6937001 (2005-08-01), Ueda
patent: 2004/0155700 (2004-08-01), Gower et al.
Larson Tony R.
Teel John C.
Englund Terry L.
Moore J. Dennis
Tra Quan
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