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:
Nov. 16, 2010
Filed:
Jun. 28, 2005
Doug Frey, Bethlehem, PA (US);
Axel Thomsen, Austin, TX (US);
Ligang Zhang, Oceanside, CA (US);
Silicon Laboratories Inc., Austin, TX (US);
Abstract
A noise cancellation signal is generated for a fractional-N phase-locked loop (). A divide value is provided to a first delta sigma modulator circuit (), which generates a divide control signal to control a divide value of a feedback divider () in the phase-locked loop. An error term (e) is generated that is indicative of a difference between the generated divide control signal and the divide value supplied to the first delta sigma modulator circuit. The error term is integrated in an integrator () to generate an integrated error term (x), where x=x+e; and a phase error correction circuit () utilizes the error term eand the integrated error term xto generate the phase error cancellation signal.