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:
Jun. 09, 2009
Filed:
Jan. 10, 2006
Zhangqi Guo, San Jose, CA (US);
Anna Tam, Sunnyvale, CA (US);
Zhangqi Guo, San Jose, CA (US);
Anna Tam, Sunnyvale, CA (US);
Pericom Semiconductor Corp., San Jose, CA (US);
Abstract
A switch fabric that carries analog differential signals is constructed from 2×2 switches. Each 2×2 switch has two differential inputs that are applied to two demultiplexers. Each 2×2 switch also has two differential outputs, each driven by an equalizing mux. Each demultiplexer has two amplifiers that drive intermediate differential signals to the two equalizing muxes. Each equalizing mux has two equalizers that receive the intermediate differential signals from the two demultiplexers. A select signal enables one equalizer but disables the other to select one of the two intermediate differential inputs. A combining amplifier receives differential outputs from both equalizers and generates a final differential output. R, C values in each equalizer can be adjusted to compensate for loading variations in the intermediate differential signals which can have different physical lengths in a switch fabric.