Patents by Inventor Akihiro Kanbe

Akihiro Kanbe 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).

  • Envelope tracking power supply circuit and high-frequency amplifier including envelope tracking power supply circuit
    Patent number: 8587271
    Abstract: An envelope tracking power supply circuit is a power supply circuit for generating an output voltage according to the envelope of a high frequency signal and includes a voltage follower circuit for receiving an envelope signal and outputting a voltage according to the envelope signal; two parallel resistors connected in parallel between the output of the voltage follower circuit and an output terminal; hysteresis comparators for detecting respective voltage drops in the parallel resistors and generating voltages according to the voltage drops; and switching converters for performing switching according to the respective voltages outputted from the hysteresis comparators and outputting a voltage to the output terminal.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: November 19, 2013
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Akihiro Kanbe, Masato Kaneta, Haruo Kobayashi, Hitoshi Hirata, Tatsuhiro Shimura
  • ENVELOPE TRACKING POWER SUPPLY CIRCUIT AND HIGH-FREQUENCY AMPLIFIER INCLUDING ENVELOPE TRACKING POWER SUPPLY CIRCUIT
    Publication number: 20110031953
    Abstract: The invention aims to maintain a high efficiency even for a high-frequency signal having a wideband envelope. The envelope tracking power supply circuit 5 is a power supply circuit for generating an output voltage according to the envelope of a high frequency signal and comprises a voltage follower circuit 7 for receiving an envelope signal and outputting a voltage according to the envelope signal SE; two parallel resistors Rsense connected in parallel between the output of the voltage follower circuit 7 and an output terminal PO; hysteresis comparators 9a, 9b for detecting respective voltage drops in the parallel resistors Rsense and generating voltages according to the voltage drops; and switching converters 11a, 11b for performing switching according to the respective voltages outputted from the hysteresis comparators 9a, 9b and outputting a voltage to the output terminal PO.
    Type: Application
    Filed: February 3, 2009
    Publication date: February 10, 2011
    Inventors: Akihiro Kanbe, Masato Kaneta, Haruo Kobayashi, Hitoshi Hirata, Tatsuhiro Shimura