Patents by Inventor Shingo Hashida

Shingo Hashida 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).

  • Spectrum analyzer
    Patent number: 5777464
    Abstract: The object of a spectrum analyzer of present invention is to increase a frequency stability and SPAN probability. A voltage control oscillator is rendered to a locked state based on a frequency as a reference frequency output from a direct digital synthesizer. Thereafter, the voltage control oscillator performs a sweep operation for a signal output therefrom, based on a frequency error to which a ramp signal is added by an adder, that is, based on the reference frequency output from the direct digital synthesizer.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: July 7, 1998
    Assignee: Advantest Corporation
    Inventors: Hiroaki Takaoku, Shingo Hashida