CMOS bandgap reference with low voltage operation

Details CMOS bandgap reference with low voltage operation CMOS bandgap reference with low voltage operation

2006-07-18

2006-07-18

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

07078958

ABSTRACT:
A bandgap reference voltage generator includes, in part, a first closed-loop circuit having a first operational amplifier and adapted to generate a first current with a positive temperature coefficient and a second closed-loop circuit having a second operational amplifier and adapted to generate a second current with a negative temperature coefficient. The bandgap reference voltage generator is further adapted to include a multitude of output stages. Each output stage may be independently scaled to sum any selected multiple of the first current to any selected multiple of the second current to generate an output voltage having either a nearly zero, a positive or a negative temperature coefficient. For example, the first output stage may be scaled to generate a reference output voltage with a nearly zero temperature coefficient. Similarly, the second output stage may be scaled to generate a reference output voltage with a negative temperature coefficient.

REFERENCES:
patent: 5666046 (1997-09-01), Mietus
patent: 6489835 (2002-12-01), Yu et al.
patent: 6563371 (2003-05-01), Buckley et al.
patent: 2002/0014914 (2002-02-01), Perque et al.
Leung et al., “A Sub-1-V ppm/°C CMOS Bandgap Voltage Reference Without Requiring Low Threshold Voltage Device,”IEEE Journal of Solid State Circuits, vol. 37, No. 4, Apr. 2002, pp. 526-530.

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