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:
Apr. 20, 2010
Filed:
Oct. 10, 2007
Chun-chih Hou, Tainan County, TW;
Wei-hsuan Tu, Hsinchu, TW;
Chun-Chih Hou, Tainan County, TW;
Wei-Hsuan Tu, Hsinchu, TW;
Mediatek Inc., Hsin-Chu, TW;
Abstract
Variable gain amplifiers with wider linear range are provided, in which first and second loads are coupled to a power voltage, and a transconductor cell comprises first and second transistors, a gain control transistor, and first and second current sources. The first and second transistors comprise control terminals receiving a set of input signals, first terminals coupled to the first and second loads respectively, and second terminal coupled to first and second nodes respectively. The first and second current sources are coupled between the first node and a first voltage and between the second node and the first voltage respectively. The first gain control transistor is coupled between the first node and second node, receiving a gain control voltage, in which the grain control transistor has a threshold voltage lower than that of the first and second transistors.