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. 01, 2014
Filed:
Jan. 31, 2013
Texas Instruments Incorporated, Dallas, TX (US);
Andrew Pickering, Warwickshire, GB;
Andrew Stewart, Northamptonshire, GB;
Benjamin James Kerr, Northamptonshire, GB;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
The present invention provides an improvement of a 4-quadrant clock phase interpolator design to allow independent rotation of the output clocks in steps of 90°. This feature is useful in clock/data recovery where the 90° 'jumps' can be used as a coarse control to re-align the data capture clock to achieve any desired data word alignment and/or receive bus clock alignment. The phase interpolator has a switching circuit comprising a single level of switches; a set of four transistor loads; and a set of four current sources operable to be switched by the switching circuit through to any of the set of four transistor loads.