Patents by Inventor Takeki Ebina

Takeki Ebina 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).

  • Operational amplifier having its compensator capacitance temporarily disabled
    Patent number: 7619478
    Abstract: An operational amplifier includes a differential amplifier connected between an input and an output port of the operational amplifier, a phase compensator capacitance connected between the differential amplifier and the output port, a switching transistor for controlling the connection between the phase compensator capacitance and the differential amplifier, a detection transistor responsive to a potential difference between the input and output ports to be rendered conductive, and a control transistor responsive to the detection transistor for controlling the switching transistor. The operational amplifier has its slew rate improved without detracting from stability against oscillation and continuity of the output waveform.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: November 17, 2009
    Assignee: Oki Semiconductor Co., Ltd.
    Inventors: Koji Yamazaki, Takeki Ebina
  • OPERATIONAL AMPLIFIER HAVING ITS COMPENSATOR CAPACITANCE TEMPORARILY DISABLED
    Publication number: 20080238497
    Abstract: An operational amplifier includes a differential amplifier connected between an input and an output port of the operational amplifier, a phase compensator capacitance connected between the differential amplifier and the output port, a switching transistor for controlling the connection between the phase compensator capacitance and the differential amplifier, a detection transistor responsive to a potential difference between the input and output ports to be rendered conductive, and a control transistor responsive to the detection transistor for controlling the switching transistor. The operational amplifier has its slew rate improved without detracting from stability against oscillation and continuity of the output waveform.
    Type: Application
    Filed: March 5, 2008
    Publication date: October 2, 2008
    Applicant: OKI ELECTRIC INDUSTRY CO., LTD.
    Inventors: Koji YAMAZAKI, Takeki EBINA