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. 18, 2010
Filed:
Jul. 09, 2008
Yi-hsien Cho, Taichung County, TW;
Yu-hsin Lin, Taipei, TW;
Yi-Hsien Cho, Taichung County, TW;
Yu-Hsin Lin, Taipei, TW;
Mediatek Inc., Hsin-Chu, TW;
Abstract
A reference buffer circuit is disclosed, providing a reference voltage at an output node and comprising a closed-loop branch comprising an amplifier and first and second MOS transistors and an open-loop branch comprising third and fourth MOS transistors and a tracking circuit. The first MOS transistor has a gate coupled to an output terminal of the amplifier and a source coupled to a negative input terminal of the amplifier. The second MOS transistor is coupled to the source of the first MOS transistor. The third MOS transistor has a gate coupled to the output terminal and a source coupled to the output node. The fourth MOS transistor has a drain coupled to the source of the third MOS transistor. A gate voltage of the fourth MOS transistor tracks a drain voltage of the third MOS transistor through the tracking circuit.