Patents by Inventor Richard Ellis Jennings

Richard Ellis Jennings 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).

  • Dual path phase locked loop (PLL) with digitally programmable damping
    Patent number: 7777577
    Abstract: In a method and apparatus for controlling damping and bandwidth in a phase locked loop (PLL), a loop filter is configured to have a dual path for charge pump current. A 3 dB bandwidth of the PLL is controlled by adjusting gain of a proportional current path. An integral current path includes a gating circuit to digitally control an amount of time an integral charge pump current received is passed through as an effective integral charge pump current. A resistor and capacitor (RC) circuit filters the proportional and effective integral charge pump currents, thereby providing a filtered input to a voltage controlled oscillator. Damping and hence peaking of the PLL is precisely controlled by sampling one of every p samples of the integral charge pump current to provide the effective integral charge pump current, p being an integer.
    Type: Grant
    Filed: August 21, 2008
    Date of Patent: August 17, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Richard Ellis Jennings, Md Anwar Sadat, John Thomas Wilson
  • DUAL PATH PHASE LOCKED LOOP (PLL) WITH DIGITALLY PROGRAMMABLE DAMPING
    Publication number: 20090085679
    Abstract: In a method and apparatus for controlling damping and bandwidth in a phase locked loop (PLL), a loop filter is configured to have a dual path for charge pump current. A 3 dB bandwidth of the PLL is controlled by adjusting gain of a proportional current path. An integral current path includes a gating circuit to digitally control an amount of time an integral charge pump current received is passed through as an effective integral charge pump current. A resistor and capacitor (RC) circuit filters the proportional and effective integral charge pump currents, thereby providing a filtered input to a voltage controlled oscillator. Damping and hence peaking of the PLL is precisely controlled by sampling one of every p samples of the integral charge pump current to provide the effective integral charge pump current, p being an integer.
    Type: Application
    Filed: August 21, 2008
    Publication date: April 2, 2009
    Inventors: RICHARD ELLIS JENNINGS, Md Anwar Sadat, John Thomas Wilson