Patents by Inventor Junya Kudo

Junya Kudo 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).

  • Semiconductor integrated circuit
    Patent number: 7583215
    Abstract: The A/D converter converting an analog input signal into a digital output signal is constructed with a band pass ?? modulator. The band pass ?? modulator includes: a resonator showing a band-pass characteristic at a predetermined frequency and an attenuation characteristic at another frequency; a quantizer; and a local D/A converter. A signal of difference between the analog input signal and a local analog signal of the local D/A converter is supplied to the resonator. The A/D converter further includes an adder for supplying the analog input signal to an input of the quantizer. In addition, signal transmission circuits for reducing the influence of spike noise of the quantizer on the input to the resonator are connected between an input of the adder and an input of resonator selectively. The A/D converter constructed with the band pass ?? modulator is improved in S/N ratio.
    Type: Grant
    Filed: January 14, 2008
    Date of Patent: September 1, 2009
    Assignee: Renesas Technology Corp.
    Inventors: Takaya Yamamoto, Tatsuji Matsuura, Masumi Kasahara, Hideo Nakane, Junya Kudo, Yoshitaka Jingu
  • SEMICONDUCTOR INTEGRATED CIRCUIT
    Publication number: 20080169953
    Abstract: The A/D converter converting an analog input signal into a digital output signal is constructed with a band pass ?? modulator. The band pass ?? modulator includes: a resonator showing a band-pass characteristic at a predetermined frequency and an attenuation characteristic at another frequency; a quantizer; and a local D/A converter. A signal of difference between the analog input signal and a local analog signal of the local D/A converter is supplied to the resonator. The A/D converter further includes an adder for supplying the analog input signal to an input of the quantizer. In addition, signal transmission circuits for reducing the influence of spike noise of the quantizer on the input to the resonator are connected between an input of the adder and an input of resonator selectively. The A/D converter constructed with the band pass ?? modulator is improved in S/N ratio.
    Type: Application
    Filed: January 14, 2008
    Publication date: July 17, 2008
    Inventors: Takaya YAMAMOTO, Tatsuji Matsuura, Masumi Kasahara, Hideo Nakane, Junya Kudo, Yoshitaka Jingu