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:
Apr. 23, 2013
Filed:
Dec. 16, 2011
Sridhar Cheruku, Bangalore, IN;
Sivaramakrishnan Subramanian, Bangalore, IN;
Nidhir Kumar, Bangalore, IN;
Sridhar Cheruku, Bangalore, IN;
Sivaramakrishnan Subramanian, Bangalore, IN;
Nidhir Kumar, Bangalore, IN;
ARM Limited, Cambridge, GB;
Abstract
Calibration circuitryfor an off-chip driver circuitand/or an on-die termination circuitis provided using a parallel network of main transistors controlled by a N-bit calibration value. During the calibration operation, the N-bit calibration value is varied until a threshold impedance value is crossed by the combination of the main transistors. A rounding transistoris then used to determine which of the N-bit calibration values produces a combined impedance closest to the designed threshold impedance.