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. 29, 2007
Filed:
Jun. 25, 2004
Akhil K. Garlapati, Boston, MA (US);
David Pietruszynski, Austin, TX (US);
Bruce P. Del Signore, Hollis, NH (US);
Akhil K. Garlapati, Boston, MA (US);
David Pietruszynski, Austin, TX (US);
Bruce P. Del Signore, Hollis, NH (US);
Silicon Laboratories Inc., Austin, TX (US);
Abstract
A voltage reference generator generates a stable reference voltage that is less than the bandgap voltage of silicon for power supply voltages less than 2V, yet provides sufficient voltage headroom to operate a current mirror. In one embodiment, the voltage reference generator has a power supply rejection ratio of at least 60 dB and has comparable noise performance as compared to traditional bandgap cirucits. These advantages are achieved by subtracting a current proportional to a complement of an absolute temperature from a current proportional to the absolute temperature to generate a voltage having a positive temperature coefficient, which is then added to a voltage that is a complement of the absolute temperature to achieve a voltage that has a low temperature coefficient.