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:
Oct. 12, 2004
Filed:
Jun. 27, 2002
Yueyong Wang, Santa Clara, CA (US);
Chanh Tran, San Jose, CA (US);
Rambus Inc., Los Altos, CA (US);
Abstract
A circuit, apparatus and method for providing a balanced differential signal from incoming serial data having high or low voltage swings are provided in embodiments of the present invention. In an embodiment of the present invention, a circuit comprises a voltage source and a current source coupled to a node. A first electrical path is coupled to the voltage source and the node. A second electrical path is coupled to the voltage source and the node. The first path includes a first transistor having a first gate and a first channel. The first transistor gate is adapted to receive a reference voltage. The second path includes a second transistor having a second gate and a second channel. The second transistor gate is adapted to receive a data voltage that is variable as a positive and negative voltage relative to the reference voltage. A variable resistor is coupled to the first electrical path and the second electrical path, and provides a predetermined resistance responsive to a control signal. A signal processing circuit is coupled to the variable resistor and the node. The signal processing circuit generates a control signal responsive to the node voltage.