Patents by Inventor Maki Shibata

Maki Shibata 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 with pass-through mode
    Patent number: 8487698
    Abstract: In an amplifier with pass-through mode of the present invention, in a pass-through mode, a signal transmission transistor and a bias control transistor are turned ON and a voltage of an output terminal is maintained in a ground potential via the bias control transistor and a resistor. Thus, a power supply voltage is applied to a control terminal of the signal transmission transistor and one main terminal of the signal transmission transistor is maintained in a ground potential. Therefore, an ON-resistance of the signal transmission transistor is decreased to a minimum level.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: July 16, 2013
    Assignee: Panasonic Corporation
    Inventors: Tsunehiro Nakamura, Naoki Okamoto, Maki Shibata
  • Amplifier circuit and wireless communication device
    Patent number: 7667541
    Abstract: An amplifier circuit has a current conversion circuit that receives a high frequency signal and produces a signal current according to the high frequency signal; a gain control circuit that includes a control signal input for receiving a control signal, a first output, and a second output, and produces the signal current from the first output or the second output according to the control signal; an impedance circuit that includes a first node connected to the first output, a second node connected to the second output, and a third node, the impedance circuit presenting a predetermined impedance between the nodes; a switch circuit that is inserted between the first output and the first node; and a load impedance unit that is connected to the first output and produces a gain signal representing an amplified high frequency signal.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: February 23, 2010
    Assignee: Panasonic Corporation
    Inventors: Naoki Okamoto, Hiroyuki Kohama, Maki Shibata
  • AMPLIFIER CIRCUIT AND WIRELESS COMMUNICATION DEVICE
    Publication number: 20080265995
    Abstract: An amplifier circuit has a current conversion circuit that receives a high frequency signal and produces a signal current according to the high frequency signal; a gain control circuit that includes a control signal input for receiving a control signal, a first output, and a second output, and produces the signal current from the first output or the second output according to the control signal; an impedance circuit that includes a first node connected to the first output, a second node connected to the second output, and a third node, the impedance circuit presenting a predetermined impedance between the nodes; a switch circuit that is inserted between the first output and the first node; and a load impedance unit that is connected to the first output and produces a gain signal representing an amplified high frequency signal.
    Type: Application
    Filed: April 25, 2008
    Publication date: October 30, 2008
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Naoki Okamoto, Hiroyuki Kohama, Maki Shibata