Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-03-08
2005-03-08
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
C327S541000, C323S315000
Reexamination Certificate
active
06864741
ABSTRACT:
The junction difference used for a band gap voltage reference is designed so that it has the needed temperature coefficient without amplification. This is accomplished by the appropriate choice of the number of junctions and the appropriate current densities. Only one polarity of bipolar transistors is required. The noise terms of each junction add in root mean square, rather than be linear amplification, resulting in a lower noise reference than other designs requiring only a single type of bipolar transistors. By using metal available in standard integrated circuit processes to form a resistor, a low temperature coefficient current source can easily be obtained.
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Buche, McDonald, Lewis, Viswanathan, Jan. 2002, IEEE Journal of Solid State Circuits, vol. 37, #1, ACMOS, Band gap reference without resistors, p 81-83.
Ganesan Apparajan
Marsh Douglas G.
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