Patents by Inventor Sunguk Kim

Sunguk Kim 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).

  • Mixer circuit having improved even order noise, DC offset, and linearity characteristic
    Patent number: 7035615
    Abstract: The present invention relates to improvement of even order distortion noise, DC offset, and non-linearity of mixer circuits. According to the present invention, a mixer circuit is provided, which comprises a splitter for splitting an input signal to the first and second signal having phase difference of 180 degree, a local oscillator, first mixer for mixing the first signal with the local oscillation signal, second mixer for mixing the second signal with the local oscillation signal, and subtractor for subtracting the output of the second mixer from the output of the first mixer.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: April 25, 2006
    Assignee: Integrant Technologies Inc.
    Inventors: Youngjin Kim, Bonkee Kim, Kwyro Lee, Sunguk Kim, Yongseok Kim
  • Harmonic circuit for improving linearity
    Publication number: 20040198259
    Abstract: The present invention relates to a harmonic circuit for improving linearity, the harmonic circuit according to the present invention comprises a first terminal connected to a collector of a NPN transistor and a second terminal connected to an emitter of the NPN transistor, and removes inter-modulation noise from the signal appeared at the collector of the NPN transistor. The harmonic circuit includes a PNP transistor, a first resistor, and a second resistor. The PNP transistor generates harmonic components without affecting the main signal, and the harmonic components that are generated by the PNP transistor compensate the harmonic components that are generated by the NPN transistor by having load of different sign from the load of the harmonic components that are generated by the NPN transistor.
    Type: Application
    Filed: January 24, 2003
    Publication date: October 7, 2004
    Inventors: Sunguk Kim, Yongseok Kim
  • Mixer circuit having improved even order noise, dc offset, and linearity characteristic
    Publication number: 20030109238
    Abstract: The present invention relates to improvement of even order distortion noise, DC offset, and non-linearity of mixer circuits. According to the present invention, a mixer circuit is provided, which comprises a splitter for splitting an input signal to the first and second signal having phase difference of 180 degree, a local oscillator, first mixer for mixing the first signal with the local oscillation signal, second mixer for mixing the second signal with the local oscillation signal, and subtractor for subtracting the output of the second mixer from the output of the first mixer.
    Type: Application
    Filed: October 18, 2002
    Publication date: June 12, 2003
    Inventors: Youngjin Kim, Bonkee Kim, Kwyro Lee, Sunguk Kim, Yongseok Kim