Patents by Inventor William A. Bacon

William A. Bacon 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).

  • Phase-locked loop circuit with switchable outputs for multiple loop filters
    Patent number: 6112068
    Abstract: An electronic system, such as a wireless telephone handset (10), having multiple voltage-controlled oscillators (26, 28) so that the system can operate in a selected one of multiple frequency bands, is disclosed. Each of the voltage-controlled oscillators (26, 28) is associated with one of multiple loop filters (32, 34), which filter the control voltage (CP1, CP2) responsive to which the frequency of oscillation of the voltage-controlled oscillators (26, 28) controlled. Only one of the voltage-controlled oscillators (26, 28) is enabled at any one time, responsive to a control signal (VCOSEL). Synthesizer circuitry (30) includes a phase detector (44) which is coupled to a common node (VCOCLK) at which outputs of the voltage-controlled oscillators (26, 28) are coupled; the phase detector (44) compares the phase of this signal (VCODIV) to a reference signal (REFDIV) based on a reference clock (REFCLK), and controls a charge pump (46) accordingly.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: August 29, 2000
    Assignee: Texas Instruments Incorporated
    Inventors: Donald E. Smith, Andrew M. Henwood, William A. Bacon