Patents by Inventor Tomohiko OOHASHI

Tomohiko OOHASHI 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).

  • Linear amplifying device, input signal supplying method, and origin avoiding circuit used therein
    Patent number: 10819292
    Abstract: Ringing of a signal after passing through a low pass filter in an LINC type linear amplifier is remedied. A linear amplifying device includes the linear amplifier including the low pass filter for removing high-frequency components; and an origin avoiding circuit which receives an original input signal and is provided upstream of the linear amplifier. If the original input signal is sampled in the vicinity of an origin, the origin avoiding circuit modifies a sampled value so at to replace the sampled value with a fixed value, and supplies the modified input signal to the linear amplifier.
    Type: Grant
    Filed: May 29, 2017
    Date of Patent: October 27, 2020
    Assignee: NEC NETWORK AND SENSOR SYSTEMS, LTD
    Inventors: Yasutaka Kuroda, Noriaki Sumita, Takashi Ishikawa, Tomohiko Oohashi, Kazuki Kishi
  • LINEAR AMPLIFYING DEVICE, INPUT SIGNAL SUPPLYING METHOD, AND ORIGIN AVOIDING CIRCUIT USED THEREIN
    Publication number: 20190280653
    Abstract: Ringing of a signal after passing through a low pass filter in an LINC type linear amplifier is remedied. A linear amplifying device includes the linear amplifier including the low pass filter for removing high-frequency components; and an origin avoiding circuit which receives an original input signal and is provided upstream of the linear amplifier. If the original input signal is sampled in the vicinity of an origin, the origin avoiding circuit modifies a sampled value so at to replace the sampled value with a fixed value, and supplies the modified input signal to the linear amplifier.
    Type: Application
    Filed: May 29, 2017
    Publication date: September 12, 2019
    Applicant: NEC Network and Sensor Systems, Ltd.
    Inventors: Yasutaka KURODA, Noriaki SUMITA, Takashi ISHIKAWA, Tomohiko OOHASHI, Kazuki KISHI