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. 01, 2011
Filed:
Feb. 01, 2008
Robert Bogdan Staszewski, Garland, TX (US);
Sudheer K. Vemulapalli, Allen, TX (US);
John L. Wallberg, Richardson, TX (US);
Khurram Waheed, Plano, TX (US);
Robert Bogdan Staszewski, Garland, TX (US);
Sudheer K. Vemulapalli, Allen, TX (US);
John L. Wallberg, Richardson, TX (US);
Khurram Waheed, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An embodiment of the present invention provides a phase locked loop that operates on clock signals derived from an RF clock signal generated by the phase locked loop. A frequency reference input provides a reference clock. A controllable oscillator generates the RF clock signal with a plurality of phases. A switch is coupled to receive the RF clock, and is operative to select one of the plurality of phases. A phase detection circuit is coupled to the switch and is operable to receive a selected phase and to provide digital phase error samples indicative of a time difference between the reference clock and the selected phase.