Patents by Inventor Fumihiro Tomisawa

Fumihiro Tomisawa 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).

  • Amplifier, transmitter, and method for compensating gain
    Patent number: 8253489
    Abstract: An amplifier includes a voltage detector that detects current flowing to a drain terminal of a transistor which amplifies a signal using GaN as a voltage difference by means of voltage conversion, a compensation decision unit that decides whether or not to perform gain compensation based on the voltage difference detected by the voltage detector, and a gain compensation unit that performs the gain compensation according to the voltage difference when the compensation decision unit decides to perform the gain compensation.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: August 28, 2012
    Assignee: Fujitsu Limited
    Inventors: Fumihiro Tomisawa, Tatsuhiko Tajima
  • AMPLIFIER, TRANSMITTER, AND METHOD FOR COMPENSATING GAIN
    Publication number: 20100289585
    Abstract: An amplifier includes a voltage detector that detects current flowing to a drain terminal of a transistor which amplifies a signal using GaN as a voltage difference by means of voltage conversion, a compensation decision unit that decides whether or not to perform gain compensation based on the voltage difference detected by the voltage detector, and a gain compensation unit that performs the gain compensation according to the voltage difference when the compensation decision unit decides to perform the gain compensation.
    Type: Application
    Filed: April 8, 2010
    Publication date: November 18, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Fumihiro Tomisawa, Tatsuhiko Tajima