Patents by Inventor Takako Kawasaki

Takako Kawasaki 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).

  • Approximate n-th order function generating device and temperature compensation crystal oscillation circuit
    Patent number: 7154351
    Abstract: A circuit for generating a component of n-th order includes: six differential amplifiers (15A to 15F) having a pair of input terminals supplied with a common linear input signal and a constant level signal of a predetermined level, outputting a reversed or non-reversed signal to the linear input signal, and having a limiter function to limit the output signal to a predetermined maximum value and a minimum value; a constant level signal generation circuit for supplying the constant level signal to each of the six differential amplifiers; a current mirror circuit (14) for controlling current flowing in the differential amplifiers (15A to 15F); and addition resistors (16A, 16B) for adding the output current of the differential amplifiers (15A to 15F).
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: December 26, 2006
    Assignee: Asahi Kasei Microsystems Co., Ltd.
    Inventors: Takako Kawasaki, Kenji Nemoto
  • Device for generating function of approximate n-th degree and temperature compensation quartz oscillation circuit
    Publication number: 20060152294
    Abstract: A circuit for generating a component of n-th order includes: six differential amplifiers (15A to 15F) having a pair of input terminals supplied with a common linear input signal and a constant level signal of a predetermined level, outputting a reversed or non-reversed signal to the linear input signal, and having a limiter function to limit the output signal to a predetermined maximum value and a minimum value; a constant level signal generation circuit for supplying the constant level signal to each of the six differential amplifiers; a current mirror circuit (14) for controlling current flowing in the differential amplifiers (15A to 15F); and addition resistors (16A, 16B) for adding the output current of the differential amplifiers (15A to 15F).
    Type: Application
    Filed: August 27, 2003
    Publication date: July 13, 2006
    Inventors: Takako Kawasaki, Kenji Nemoto