Patents by Inventor Hiromichi Hayase

Hiromichi Hayase 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).

  • Amplification device
    Patent number: 7317353
    Abstract: An amplifier apparatus in which a signal is amplified by an amplifier and distortion produced by the amplifier is compensated for, that can continue to operate even in cases where the amplitude of a distortion component contained in the amplified signal after distortion compensation has become large. Distortion component amplitude detection means 7 and 8 detect the amplitude of distortion components produced by the amplifier 4 that are contained in signals amplified by the amplifier 4 after distortion compensation, and when the amplitude of a detected distortion component exceeds a predetermined threshold value, amplified signal level reduction control means 9 and 1 perform control to reduce the level of the signal amplified by the amplifier 4.
    Type: Grant
    Filed: September 19, 2003
    Date of Patent: January 8, 2008
    Assignee: Hitachi Kokusai Electric Inc.
    Inventor: Hiromichi Hayase
  • Amplification device
    Publication number: 20060091950
    Abstract: An amplifier apparatus in which a signal is amplified by an amplifier and distortion produced by the amplifier is compensated for, that can continue to operate even in cases where the amplitude of a distortion component contained in the amplified signal after distortion compensation has become large. Distortion component amplitude detection means 7 and 8 detect the amplitude of distortion components produced by the amplifier 4 that are contained in signals amplified by the amplifier 4 after distortion compensation, and when the amplitude of a detected distortion component exceeds a predetermined threshold value, amplified signal level reduction control means 9 and 1 perform control to reduce the level of the signal amplified by the amplifier 4.
    Type: Application
    Filed: September 19, 2003
    Publication date: May 4, 2006
    Inventor: Hiromichi Hayase
  • MOSFET amplifier circuit
    Patent number: 6335657
    Abstract: A metal-oxide semiconductor field-effect transistor (MOSFET) amplifier circuit includes a compensation circuit with a low cost MOSFET and a constant current circuit providing a constant drain current of the MOSFET, which maintains an operational point of the amplifier at an optimal state at all times. The MOSFET amplifier circuit includes a first MOSFET, a constant current circuit including a variable resistor, an operational amplifier, a power supply and a resistor, a second MOSFET having a constant current generated by the constant current circuit as a drain current thereof, and a voltage control circuit including operational amplifiers and resistors for applying a gate source voltage of the second MOSFET to the first MOSFET as a gate-source voltage thereof.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: January 1, 2002
    Assignee: Kokusai Electric Co. Ltd.
    Inventors: Hiromichi Hayase, Kotaro Takenaga, Takeshi Ishigami