Patents by Inventor David Harnishfeger

David Harnishfeger 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).

  • Patent number: 8433255
    Abstract: In embodiments of the present disclosure, a method may include determining an ambient temperature of an oscillator. The method may also include estimating an approximate frequency of operation of the oscillator. The method may additional include determining a process-based compensation to be applied to a resonator of the oscillator based on the approximate frequency. The method may further include setting a capacitance of a variable capacitor coupled to the resonator in order to compensate for temperature-dependent and process-dependent frequency variation of the oscillator based on the ambient temperature and the process-based compensation.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: April 30, 2013
    Assignee: Fujitsu Semiconductor Limited
    Inventor: David Harnishfeger
  • Publication number: 20130039368
    Abstract: In accordance with some embodiments of the present disclosure, a method may include determining a range of frequencies allocated to resource blocks to be transmitted during a subsequent sub-frame slot or sounding reference symbol sub-slot. The method may also include determining an approximate center frequency of the range of frequencies. The method may additionally include modulating resource blocks of the sub-frame or sounding reference symbol sub-slot at the approximate center frequency. The method may further include transmitting the modulated resource blocks at the approximate center frequency.
    Type: Application
    Filed: August 12, 2011
    Publication date: February 14, 2013
    Applicant: FUJITSU SEMICONDUCTOR LIMITED
    Inventors: Daniel B. Schwartz, David Harnishfeger, Jeffrey D. Ganger, George B. Norris, Bing Xu, Mark Alan Kirschenmann, Claudio Rey
  • Publication number: 20130012141
    Abstract: In embodiments of the present disclosure, a method may include determining an ambient temperature of an oscillator. The method may also include estimating an approximate frequency of operation of the oscillator. The method may additional include determining a process-based compensation to be applied to a resonator of the oscillator based on the approximate frequency. The method may further include setting a capacitance of a variable capacitor coupled to the resonator in order to compensate for temperature-dependent and process-dependent frequency variation of the oscillator based on the ambient temperature and the process-based compensation.
    Type: Application
    Filed: July 5, 2011
    Publication date: January 10, 2013
    Applicant: FUJITSU SEMICONDUCTOR LIMITED
    Inventor: David Harnishfeger
  • Publication number: 20050040906
    Abstract: A voltage controlled oscillator (VCO) for use in a personal area network synthesizer includes a delay cell (100), a first current amplifier (201, 203) for amplifying an input current, a resister capacitor (RC) tuning network (207, 209, 211) for varying the amount of amplification and delay of an output of the first current amplifier. A second current amplifier (213, 215) is then used for amplifying an output current from the RC tuning network. The invention includes a unique composite voltage variable capacitor (CVVC) (300) for precisely tuning the amount of delay presented by the delay cell. The unique topology of the delay cell (100) allows it to be readily used in voltage controlled oscillators (VCOs) operable at frequencies above 1 GHz.
    Type: Application
    Filed: August 19, 2003
    Publication date: February 24, 2005
    Inventors: Daniel Brueske, David Harnishfeger, Stephen Machan