Patents by Inventor Youngho Cho

Youngho Cho 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).

  • Broadband variable gain amplifier with high linearity and variable gain characteristic
    Patent number: 6882226
    Abstract: A broadband variable gain amplifier with improved linearity and gain characteristic is provided. According to the present invention, the broadband variable gain amplifier comprises: an amplification unit for amplifying an input signal applied to an input terminal and outputting an amplified signal to an output terminal; and a gain control unit which is connected between the input and output terminals, and for controlling gain of said amplification unit, wherein said gain control unit comprises: a variable resistance unit whose resistance value is varied according to a control signal; and a broadband matching unit for proving an optimal impedance characteristic to the input terminal said amplification unit in a broad band, where in said variable gain resistance unit and said broadband matching unit is connected in parallel.
    Type: Grant
    Filed: May 15, 2003
    Date of Patent: April 19, 2005
    Assignee: Integrant Technologies Inc.
    Inventors: Youngho Cho, Bo-Eun Kim, Bonkee Kim
  • Broadband variable gain amplifier with high linearity and variable gain characteristic
    Publication number: 20030214357
    Abstract: A broadband variable gain amplifier with improved linearity and gain characteristic is provided. According to the present invention, the broadband variable gain amplifier comprises: an amplification unit for amplifying an input signal applied to an input terminal and outputting an amplified signal to an output terminal; and a gain control unit which is connected between the input and output terminals, and for controlling gain of said amplification unit, wherein said gain control unit comprises: a variable resistance unit whose resistance value is varied according to a control signal; and a broadband matching unit for proving an optimal impedance characteristic to the input terminal said amplification unit in a broad band, where in said variable gain resistance unit and said broadband matching unit is connected in parallel.
    Type: Application
    Filed: May 15, 2003
    Publication date: November 20, 2003
    Applicant: INTEGRANT TECHNOLOGIES INC.
    Inventors: Youngho Cho, Bo-Eun Kim, Bonkee Kim
  • Method and apparatus for determining membrane pore size distribution
    Patent number: 6508935
    Abstract: Described in the present invention are a method for determining the pore size distribution of a membrane filter based on the molecular mass distribution curve of the rejected solute fraction of a feed solution when the feed is passed through the membrane, and an apparatus suitable for practicing said method.
    Type: Grant
    Filed: May 22, 2001
    Date of Patent: January 21, 2003
    Assignee: Kwangju Institute of Science & Technology
    Inventors: Jaeweon Cho, Sangyoup Lee, Youngho Cho
  • Method and apparatus for determining membrane pore size distribution
    Publication number: 20020060187
    Abstract: Described in the present invention are a method for determining the pore size distribution of a membrane filter based on the molecular mass distribution curve of the rejected solute fraction of a feed solution when the feed is passed through the membrane, and an apparatus suitable for practicing said method.
    Type: Application
    Filed: May 22, 2001
    Publication date: May 23, 2002
    Inventors: Jaeweon Cho, Sangyoup Lee, Youngho Cho