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. 28, 2012
Filed:
Jun. 21, 2010
James P. Flynn, Beaverton, OR (US);
Junqi Hua, Portland, OR (US);
John T. Stonick, Portland, OR (US);
Daniel K. Weinlader, Allentown, PA (US);
Jianping Wen, Beaverton, OR (US);
Skye Wolfer, Hillsboro, OR (US);
David A. Yokoyama-martin, Portland, OR (US);
James P. Flynn, Beaverton, OR (US);
Junqi Hua, Portland, OR (US);
John T. Stonick, Portland, OR (US);
Daniel K. Weinlader, Allentown, PA (US);
Jianping Wen, Beaverton, OR (US);
Skye Wolfer, Hillsboro, OR (US);
David A. Yokoyama-Martin, Portland, OR (US);
Synopsys, Inc., Mountain View, CA (US);
Abstract
Some embodiments of the present invention provide a voltage-mode transmitter. The transmitter can include configuration circuitry, bias circuitry, and a set of driver slices. Each driver slice can include driver transistors which drive an output value. The outputs of each driver slice can be directly or capacitively coupled with the transmitter's outputs. Each driver slice can also include one or more impedance-matching transistors which are serially coupled to at least some of the driver transistors. The configuration circuitry can configure a subset of driver slices so that the down (or up) impedance of the transmitter is within a first tolerance of a desired impedance value. The bias circuitry can bias the one or more impedance-matching transistors in each driver slice in the subset of driver slices so that the up (or down) impedance is within a second tolerance of the down (or up) impedance.