Electric reference voltage generating device of improved...

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

Reexamination Certificate

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Reexamination Certificate

active

11062888

ABSTRACT:
The present invention relates to a device for generation of a reference electrical voltage. The device includes a first current generator outputting a current proportional to temperature. The first current generator comprises at least one operational amplifier and two branches in parallel, a first branch comprising a first current source and a first bipolar transistor, and a second branch comprising a second current source, a first resistance and a second bipolar transistor. A second current generator outputs a current conversely proportional to temperature. The device includes means of summating the currents so as to obtain a voltage independent of the said temperature, and means of reducing dependence of the current circulating in the said first branch on the value of the said first resistance. The reduction means comprises at least one second resistance with a non-adjustable value.

REFERENCES:
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patent: 7034514 (2006-04-01), Tachibana et al.
patent: 2002/0125938 (2002-09-01), Kim et al.
patent: 0 197 965 (1991-01-01), None
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patent: 2 842 317 (2004-01-01), None
V. Gupta et al., “Predicting the Effects of Error Sources in Bandgap Reference Circuits and Evaluating Their Design Implications”, IEEE, XP002300515, vol. 3, 2002, pp. III-575 to III-578.
H. Banba et al., “A CMOS Bandgap Reference Circuit with Sub-l-V Operation”, IEEE Journal of Solid-State Circuits, vol. 34, No. 5, May 1999, pp. 670-674.

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