Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2008-06-03
2008-06-03
Richards, N. Drew (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S513000, C323S313000
Reexamination Certificate
active
07382179
ABSTRACT:
A composite voltage reference with improved temperature stability includes a monolithic voltage reference integrated circuit (“IC”). The voltage reference IC has an internal voltage reference, an internal OpAmp circuit including scaling resistors, a monolithic voltage reference IC temperature coefficient, and a user accessible input to vary a monolithic voltage reference IC output voltage. A second voltage reference has a second voltage reference temperature coefficient lower than the monolithic voltage reference IC temperature coefficient. The second voltage reference is electrically coupled to the user accessible input wherein the temperature coefficient of the composite circuit of the monolithic voltage reference IC and the second voltage reference is improved over the monolithic voltage reference IC temperature coefficient.
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Hernandez William
Richards N. Drew
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