The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 2003
Filed:
Mar. 09, 2001
Joshua C. Park, Madford, MA (US);
Xiaodong Wang, Acton, MA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A bandgap reference voltage circuit having a bandgap start-up circuit for initiating operation of the bandgap reference voltage circuit, a bandgap core circuit for developing a bandgap reference voltage, and a bandgap output circuit for supplying a bandgap reference voltage. The bandgap start-up circuit is connected to a low impedance leg in the bandgap core circuit and the bandgap output circuit has a feedback circuit that is connected to a high impedance leg in the bandgap core circuit. The connection of the bandgap start-up circuit to the low impedance leg of the bandgap core circuit eliminates the possibility of metastable operation of the bandgap reference voltage circuit. This bandgap reference voltage circuit can be used in battery powered units having reduced supply voltages as low as, for example, 1.7V and the arrangement of the feedback circuit of the bandgap output circuit allows supplying of reference voltages greater and less than typical bandgap voltage.