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:
Feb. 03, 2009
Filed:
Jun. 01, 2007
Min-chuan Wang, Taichung, TW;
Chih-sheng Lin, Tainan County, TW;
Chia-pao Chang, Taipei County, TW;
Keng-li Su, Hsinchu, TW;
Min-Chuan Wang, Taichung, TW;
Chih-Sheng Lin, Tainan County, TW;
Chia-Pao Chang, Taipei County, TW;
Keng-Li Su, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
The invention provides a multi-state sense amplifier, coupled to at least one memory cell with changeable resistance and a plurality of reference cells. The first current mirror circuit, coupled to the output terminal of the memory cell, generates a second memory cell current at a first node according to a first memory cell current through the memory cell. The second current mirror circuit, coupled to the output terminal of the reference cells, generates a plurality of second reference currents at a plurality of second nodes according to a plurality of first reference currents through the reference cells. The load circuit, coupled to the first node, the second nodes, and a ground, provides equal loads for the second memory cell current and the second reference currents to respectively generate a memory cell voltage at the first node and a plurality of reference voltages at the second nodes.