Patents by Inventor Tae Roh

Tae Roh 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).

  • Publication number: 20080038891
    Abstract: Provided are high voltage metal oxide semiconductor field effect transistor (HVMOSFET) having a Si/SiGe heterojunction structure and method of manufacturing the same. In this method, a substrate on which a Si layer, a relaxed SiGe epitaxial layer, a SiGe epitaxial layer, and a Si epitaxial layer are stacked or a substrate on which a Si layer having a well region, a SiGe epitaxial layer, and a Si epitaxial layer are stacked is formed. For the device having the heterojunction structure, the number of conduction carriers through a potential well and the mobility of the carriers increase to reduce an on resistance, thus increasing saturation current. Also, an intensity of vertical electric field decreases so that a breakdown voltage can be maintained at a very high level. Further, a reduction in vertical electric field due to the heterojunction structure leads to a gain in transconductance (Gm), with the results that a hot electron effect is inhibited and the reliability of the device is enhanced.
    Type: Application
    Filed: May 8, 2007
    Publication date: February 14, 2008
    Inventors: Young CHO, Sung KWON, Tae ROH, Dae LEE, Jong KIM
  • Publication number: 20070190709
    Abstract: Provided is a multiple-gate metal oxide semiconductor (MOS) transistor and a method for manufacturing the same, in which a channel is implemented in a streamline shape, an expansion region is implemented in a gradually increased form, and source and drain regions is implemented in an elevated structure by using a difference of a thermal oxidation rate depending on a crystal orientation of silicon and a geographical shape of the single-crystal silicon pattern. As the channel is formed in a streamline shape, it is possible to prevent the degradation of reliability due to concentration of an electric field and current driving capability by the gate voltage is improved because the upper portion and both sides of the channel are surrounded by the gate electrodes. In addition, a current crowding effect is prevented due to the expansion region increased in size and source and drain series resistance is reduced by elevated source and drain structures, thereby increasing the current driving capability.
    Type: Application
    Filed: March 26, 2007
    Publication date: August 16, 2007
    Inventors: Young Cho, Sung Kwon, Tae Roh, Dae Lee, Jong Kim
  • Publication number: 20070132495
    Abstract: A high-reliability, multi-threshold complementary metal oxide semiconductor (CMOS) latch circuit having low sub-threshold leakage current is provided. More particularly, a latch circuit and flip-flop that can be applied in the deep sub-micron era and that are entirely configured of only CMOS using a combination of a high threshold device and a low threshold device and a low-threshold-voltage stack structure, without using a power gating technique such as multi-threshold CMOS (MTCMOS) and a back bias voltage control technique such as variable threshold CMOS (VTCMOS), are provided.
    Type: Application
    Filed: September 13, 2006
    Publication date: June 14, 2007
    Inventors: Yil Yang, Jong Kim, Tae Roh, Dae Lee
  • Publication number: 20070069254
    Abstract: Provided are a multiple-gate MOS (metal oxide semiconductor) transistor and a method of manufacturing the same. The transistor includes a single crystalline active region having a channel region having an upper portion of a streamlined shape (?) obtained by patterning an upper portion of a bulk silicon substrate with an embossed pattern, and having a thicker and wider area than the channel region; a nitride layer formed at both side surfaces of the single crystalline active region to expose an upper portion of the single crystalline active region at a predetermined height; and a gate electrode formed to be overlaid with the exposed upper portion of the single crystalline active region of the channel region.
    Type: Application
    Filed: June 6, 2006
    Publication date: March 29, 2007
    Inventors: Young Cho, Tae Roh, Jong Kim
  • Publication number: 20060112258
    Abstract: Provided is a parallel data path architecture for high energy efficiency. In this architecture, a plurality of parallel process units and a plurality of function units of the process units are controlled by instructions and processed in parallel to improve performance. Also, since only necessary process units and function units are enabled, power dissipation is reduced to enhance energy efficiency. Further, by use of a simple instruction format, hardware can be programmed as the parallel data path architecture for high energy efficiency, which satisfies both excellent performance and low power dissipation, thus elevating hardware flexibility.
    Type: Application
    Filed: June 6, 2005
    Publication date: May 25, 2006
    Inventors: Yil Yang, Tae Roh, Dae Lee, Sang Lee, Jong Kim
  • Publication number: 20050263821
    Abstract: Provided is a multiple-gate metal oxide semiconductor (MOS) transistor and a method for manufacturing the same, in which a channel is implemented in a streamline shape, an expansion region is implemented in a gradually increased form, and source and drain regions is implemented in an elevated structure by using a difference of a thermal oxidation rate depending on a crystal orientation of silicon and a geographical shape of the single-crystal silicon pattern. As the channel is formed in a streamline shape, it is possible to prevent the degradation of reliability due to concentration of an electric field and current driving capability by the gate voltage is improved because the upper portion and both sides of the channel are surrounded by the gate electrodes. In addition, a current crowding effect is prevented due to the expansion region increased in size and source and drain series resistance is reduced by elevated source and drain structures, thereby increasing the current driving capability.
    Type: Application
    Filed: November 16, 2004
    Publication date: December 1, 2005
    Inventors: Young Cho, Sung Kwon, Tae Roh, Dae Lee, Jong Kim
  • Publication number: 20050224880
    Abstract: Provided are a multi-gate MOS transistor and a method of manufacturing the same. Two silicon fins are vertically stacked on a silicon on insulator (SOI) substrate, and four side surfaces of an upper silicon fin and three side surfaces of a lower silicon fin are used as a channel. Therefore, a channel width is increased, so that current driving capability of a device is improved, and high performance nano-level semiconductor IC and highly integrated memory IC can be manufactured through the optimization and stability of a process.
    Type: Application
    Filed: December 16, 2004
    Publication date: October 13, 2005
    Inventors: Dae Lee, Tae Roh, Sung Kwon, Il Park, Yil Yang, Byoung Yu, Jong Kim
  • Publication number: 20050140595
    Abstract: Provided is a source driver circuit for an active matrix electroluminescent (EL) display including a digital-to-analog converter/ramp circuit for converting a digital signal into an analog signal, and generating a ramp signal in this process, simultaneously, whereby high degree of integration would be possible since a conventional complicated circuit is not required and gray scale with the high characteristic can be implanted, regardless of a change of a temperature or a threshold voltage.
    Type: Application
    Filed: April 6, 2004
    Publication date: June 30, 2005
    Inventors: Yil Yang, Jong Kim, Dae Lee, Tae Roh, Il Park, Sung Kwon, Byoung Yu