Patents by Inventor Khaled M. Sharaf

Khaled M. Sharaf has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Fractional-spurs suppression scheme in frequency tracking multi-band fractional-N phase lock loop
    Patent number: 6308049
    Abstract: The present invention discusses fractional compensation timing circuitry (15) to track a VCO output frequency, fO, and provide highly effective error cancellation in a fractional-N PLL synthesizer. This output frequency tracking is used to suppress spurious sidebands, commonly known as spurs, in both fixed-band and multi-band wireless transceiver applications which use fractional-N PLL synthesizers. Some of the critical parameters which benefit from this type of PLL include switching time, phase noise, and reference feed-through.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: October 23, 2001
    Assignee: Texas Instruments Incorporated
    Inventors: Abdellatif Bellaouar, Khaled M. Sharaf, Ahmed Reda Fridi
  • Low power fractional pulse generation in frequency tracking multi-band fractional-N phase lock loop
    Patent number: 6249685
    Abstract: Multi-band fractional-N PLL synthesizers with built-in spurious sideband compensation, which tracks the VCO output, tend to consume large amounts of power (as much as 10 times) due to the RF operation of the compensation circuitry. This patent introduces a dynamic power approach where the compensation circuitry is biased only during the fractional portion of the cycle. This technique provides the advantages of fractional-N synthesizers with spur suppression, such as higher speed and lower phase noise with ultra low power dissipation.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: June 19, 2001
    Assignee: Texas Instruments Incorporated
    Inventors: Khaled M. Sharaf, Abdellatif Bellaouar