Nauman Afzal

US Patent:

20140117966, May 1, 2014

Filed:

Dec 20, 2012

Appl. No.:

13/722679

Inventors:

- Sunnyvale CA, US
Nauman AFZAL - San Ramon CA, US

Assignee:

INVENSENSE, INC. - Sunnyvale CA

International Classification:

G05F 3/02

US Classification:

323313

Abstract:

A curvature-corrected bandgap reference is disclosed. The curvature-corrected bandgap reference comprises a Brokaw bandgap circuit. The Brokaw bandgap circuit includes an output node providing a reference voltage. The Brokaw bandgap circuit further comprising a first BJT device including a first base terminal coupled to the output node and a first emitter terminal. The first BJT device operates at a first current density that is substantially proportional to absolute temperature. The curvature-corrected bandgap reference also includes a second BJT device including a second base terminal coupled to the output node and a second emitter terminal. The second BJT device operates at a second current density that is substantially independent of temperature. Finally the curvature-corrected bandgap reference includes a correction voltage proportional to a voltage difference of the first and second emitter terminals, wherein the correction voltage substantially cancels a curvature of the reference voltage.