Patents by Inventor Katsuyuki Yaginuma

Katsuyuki Yaginuma 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).

  • Jitter generation apparatus, device test system using the same, and jitter generation method
    Patent number: 8143959
    Abstract: A jitter generation apparatus for applying a phase modulation to a PLL is controlled by a control unit so as to output a signal with the desired jitter based on a parameters. When a switching unit is switched to a first state, the control unit controls first and second level control units so that the desired jitter in which an amplitude of a first modulation signal matches the parameter is added to an output signal from a voltage controlled oscillator unit, and passes through a quadrature modulator. When the switching unit is switched to the second state, the control unit controls the first and second level control units so that a quadrature modulation is applied to a local signal, which is input to the quadrature modulator without adding any jitter to an output signal from the voltage controlled oscillator unit, and a quadrature-modulated local signal is output.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: March 27, 2012
    Assignee: Anritsu Corporation
    Inventors: Katsuyuki Yaginuma, Tadanori Nishikobara
  • JITTER GENERATION APPARATUS, DEVICE TEST SYSTEM USING THE SAME, AND JITTER GENERATION METHOD
    Publication number: 20100150218
    Abstract: A jitter generation apparatus for applying a phase modulation to a PLL is controlled by a control unit so as to output a signal with the desired jitter based on a parameters. When a switching unit is switched to a first state, the control unit controls first and second level control units so that the desired jitter in which an amplitude of a first modulation signal matches the parameter is added to an output signal from a voltage controlled oscillator unit, and passes through a quadrature modulator. When the switching unit is switched to the second state, the control unit controls the first and second level control units so that a quadrature modulation is applied to a local signal, which is input to the quadrature modulator without adding any jitter to an output signal from the voltage controlled oscillator unit, and a quadrature-modulated local signal is output.
    Type: Application
    Filed: March 1, 2010
    Publication date: June 17, 2010
    Applicant: ANRITSU CORPORATION
    Inventors: Katsuyuki Yaginuma, Tadanori Nishikobara