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:
Jul. 08, 2003
Filed:
Sep. 26, 2002
Ke Wu, San Jose, CA (US);
Michael Y. Zhang, Palo Alto, CA (US);
Pericom Semiconductor Corp., San Jose, CA (US);
Abstract
A differential output buffer has a primary stage and a secondary stage that each directly drive differential outputs. Link transistors between the secondary stage and the differential outputs are eliminated. The primary stage continuously receives differential inputs applied to gates of n-channel sourcing and sinking transistors. The sources of the sourcing transistors and the drains of the sinking transistors are connected to the true and complement differential outputs. The secondary stage also has n-channel sourcing and sinking transistors directly connected to the differential outputs. Pulsed inputs applied to secondary-stage gates are normally low, disabling the sourcing and sinking transistors in the secondary stage to disable the secondary stage. However, during a switching transient, the pulsed inputs are pulsed on, allowing the secondary stage to drive a boost current to the differential outputs. This boost current sharpens rise and fall edges to compensate parasitic capacitances, opening the eye pattern.