Patents by Inventor Fuminori Itukaiti

Fuminori Itukaiti 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).

  • Radio receiver with amplitude limiter prior to mixer and band limiting filter
    Patent number: 5930695
    Abstract: A radio receiver is disclosed. An arbitrary receive signal received through an antenna is amplified by an input amplifier. The signal amplified by the input amplifier is converted into a predetermined frequency by a mixer. The signal frequency-converted by the mixer is shaped in waveform by a band-limiting filter. The signal thus shaped in waveform is amplified and amplitude-limited by a limiting amplifier. The signal limited in amplitude is demodulated by a demodulator. In order to prevent the mixer circuit from generating a distortion due to an excessive input, another amplitude-limiting circuit operated at a level not saturating the mixer circuit is arranged in a stage before the mixer circuit.
    Type: Grant
    Filed: December 1, 1995
    Date of Patent: July 27, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Tsutomu Yamaguchi, Fuminori Itukaiti, Kazutoshi Higuchi, Jun'ichi Nakagawa