Patents by Inventor Toyoaki Kito

Toyoaki Kito 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).

  • Reference current source circuit provided with plural power source circuits having temperature characteristics
    Patent number: 8305134
    Abstract: A reference current source circuit outputs a constant reference current even if surrounding environments such as temperature and power source voltage change in a power source circuit that operates in a minute current region in an order of nanoamperes. The reference current source circuit includes an nMOS-configured power source circuit, a pMOS-configured power source circuit, and a current subtracter circuit. The nMOS-configured power source circuit includes a current generating nMOSFET, and generates a first current having temperature characteristics of an output current dependent on an electron mobility. The pMOS-configured power source circuit includes a current generating pMOSFET, and generates a second current having temperature characteristics of an output current dependent on a hole mobility. The current subtracter circuit generates a constant reference current by subtracting the second current from the first current.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: November 6, 2012
    Assignee: Semiconductor Technology Academic Research Center
    Inventors: Tetsuya Hirose, Toyoaki Kito, Yuji Osaki
  • REFERENCE CURRENT SOURCE CIRCUIT PROVIDED WITH PLURAL POWER SOURCE CIRCUITS HAVING TEMPERATURE CHARACTERISTICS
    Publication number: 20100225384
    Abstract: A reference current source circuit is provided which is capable of outputting a constant reference current even if surrounding environments such as temperature and power source voltage change in a power source circuit that operates in a minute current region in an order of nanoamperes. The reference current source circuit includes an nMOS-configured power source circuit, a pMOS-configured power source circuit, and a current subtracter circuit. The nMOS-configured power source circuit includes a current generating nMOSFET, and generates a first current having temperature characteristics of an output current dependent on an electron mobility. The pMOS-configured power source circuit includes a current generating pMOSFET, and generates a second current having temperature characteristics of an output current dependent on a hole mobility. The current subtracter circuit generates a constant reference current by subtracting the second current from the first current.
    Type: Application
    Filed: February 26, 2010
    Publication date: September 9, 2010
    Inventors: Tetsuya HIROSE, Toyoaki KITO, Yuji OSAKI