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. 13, 2018
Filed:
Oct. 17, 2016
Globalfoundries Inc., Grand Cayman, KY;
Suhas Shivaram, Bangalore, IN;
Giri N. K. Rangan, Bangalore, IN;
GLOBALFOUNDRIES INC., Grand Cayman, KY;
Abstract
A transmission driver impedance calibration circuit and method. A circuit is disclosed that includes: a controller for controlling a set of switches; a comparator having an output that is coupled to the controller; and a first comparator input coupled to: a first selectable node coupled between a first p-type adjustable resistor segment (PSEG) and an external resistor; and a second selectable node coupled between a pair of internal resistors; and a second comparator input coupled to: a third selectable node coupled between a second PSEG and a tcoil resistor, the tcoil resistor being further coupled in series to a n-type adjustable resistor segment (NSEG); and a fourth selectable node coupled between the tcoil resistor and the NSEG.