US Patent 7253597 Curvature corrected bandgap reference circuit and method

Patent 7253597 was granted and assigned to Analog Devices on August, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Analog Devices

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7253597

Patent Inventor Names

A. Paul Brokaw0

Date of Patent

August 7, 2007

Patent Application Number

11064668

Date Filed

February 23, 2005

Patent Primary Examiner

‌

Jeffrey Sterrett

Patent abstract

A curvature corrected bandgap reference circuit comprises a first bipolar transistor having a base-emitter voltage Vbe1 and operated such that it has a constant operating current, and a second bipolar transistor having a base-emitter voltage Vbe2 and operated such that it has an operating current consisting of an approximately temperature proportional component and a non-linear component. The circuit is arranged such that the ratio of the current densities in the two transistors varies with temperature, such that the difference voltage (ΔVbe=Vbe1−Vbe2) includes a residual component which approximately compensates bandgap curvature error.