Curvature-compensated band-gap voltage reference circuit

Details Curvature-compensated band-gap voltage reference circuit Curvature-compensated band-gap voltage reference circuit

2011-04-26

2011-04-26

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

Reexamination Certificate

active

07932772

ABSTRACT:
A band-gap reference voltage is developed by a phase-clocked band-gap circuit including a single PN junction through which first and second constant currents are alternately directed. A current proportional to absolute temperature is selectively added to one of the first and second constant currents to curvature-compensate the developed band-gap reference voltage. The band-gap circuit is calibrated at any desired temperature by interrupting the curvature compensation current and trimming the one constant current to bring the un-compensated band-gap reference voltage into correspondence with a nominal band-gap voltage functionally related to the calibration temperature and circuit component values.

REFERENCES:
patent: 6563370 (2003-05-01), Coady
patent: 7248098 (2007-07-01), Teo
patent: 7598799 (2009-10-01), Marinca
patent: 7737768 (2010-06-01), Byeon
patent: 7839202 (2010-11-01), Sengupta et al.
Pertijs et al., “A CMOS Smart Temperature Sensor With a 3-Sigma Inaccuracy of +/−0.5 Degrees C. to +120 Degrees C.”, IEEE Journal of Solid State Circuits, vol. 40, No. 2, Feb. 2005.

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