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:
Sep. 17, 2013
Filed:
Jun. 18, 2012
Sing-keng Tan, San Jose, CA (US);
Sing-Keng Tan, San Jose, CA (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
In an integrated circuit for an output interface, a comparator is used to compare a reference voltage and a regulated voltage to provide a comparison output. A state machine is coupled to the comparator to increment or decrement a resistance setting output of the state machine responsive to the comparison output. A reference single-ended driver is coupled to receive the resistance setting output from the state machine. An output node of the reference single-ended driver is coupled to a reference node. From the reference node, the reference voltage is input to the comparator as a feedback voltage. Transistors of the reference single-ended driver are set to be in either at least a substantially conductive state or at least a substantially non-conductive state responsive to the resistance setting output to provide an internal source termination resistance as a reference resistance.