Patents by Inventor Mehmet Eker

Mehmet Eker 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).

  • Methods and apparatus for producing a reference frequency signal with use of a reference frequency quadrupler having frequency selection controls
    Patent number: 6538520
    Abstract: Circuitry for a phase locked loop (PLL) includes a first frequency doubler; a first equalizer having an input coupled to an output of the first frequency doubler; a second frequency doubler having an input coupled to an output of the first equalizer; and a second equalizer having an input coupled to an output of the second frequency doubler and an output which is fed into the PLL. Each frequency doubler includes a first delay circuit having an input coupled to the input of the frequency doubler; and an XOR circuit having a first input coupled to an output of the delay circuit and a second input coupled to the input of the frequency doubler. The combination of the two frequency doublers in series quadruples the reference signal into the PLL, which allows the, PLL to have a smaller feedback divider ratio and a higher loop gain for reducing jitter. Advantageously, controls for the selection of the initial reference signal are provided.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: March 25, 2003
    Assignee: Applied Micro Circuits Corporation
    Inventors: Allen Carl Merrill, Joseph James Balardeta, Wei Fu, Mehmet Eker