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:
Aug. 14, 2007
Filed:
Nov. 22, 2005
Hai Thanh Nguyen, Sunnyvale, CA (US);
Chung-cheng Tsai, Taichung, TW;
Hai Thanh Nguyen, Sunnyvale, CA (US);
Chung-Cheng Tsai, Taichung, TW;
United Microelectronics Corp., Hsinchu, TW;
Abstract
A low-voltage differential signal driver with a pre-emphasis circuit having a current control circuit and a pre-emphasis circuit is provided. Wherein, the pre-emphasis circuit includes the current sourcing circuit and the current sinking circuit, both of which have similar circuit structure, coupled to the current control circuit, respectively. The current sourcing circuit and the current sinking circuit are controlled by two sets of driving signals, so that the pre-emphasis circuit provides an extra driving current to the current control circuit at an instant when the current control circuit switches the current direction. In addition, each set of driving signals contains two synchronous but phase-inversed driving signals. The time it takes for the current steering circuit to switch terminated resistor current between upward and downward directions is decreased.