Patents by Inventor Chang-hag Oh

Chang-hag Oh 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).

  • Patent number: 7460428
    Abstract: Provided is a DRAM having reduced current consumption and a communication terminal including the same. The DRAM includes a plurality of memory banks capable of being independently supplied with power, and a DPD controller for selectively causing some of the plurality of memory banks to enter a DPD mode.
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: December 2, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-hoon Joo, Sang-seok Kang, Byung-heon Kwak, Kang-young Cho, Chang-hag Oh
  • Publication number: 20070008802
    Abstract: Provided is a DRAM having reduced current consumption and a communication terminal including the same. The DRAM includes a plurality of memory banks capable of being independently supplied with power, and a DPD controller for selectively causing some of the plurality of memory banks to enter a DPD mode.
    Type: Application
    Filed: July 7, 2006
    Publication date: January 11, 2007
    Inventors: Jae-hoon Joo, Sang-seok Kang, Byung-heon Kwak, Kang-young Cho, Chang-hag Oh
  • Publication number: 20060132183
    Abstract: A semiconductor device that performs stable circuit operations is provided. The device includes: a pull-up driver for pulling up a first node in response to first states of input and control signals; a pull-down driver for pulling down a second node in response to a second state of the input signal; at least one fuse connected between the first node and the second node; a latch for generating an output signal to maintain the state of the second node; and a controller for generating the control signal that is maintained in a first state when the input signal is in the second state, and maintained in the first state and then transitioned to the second state after a predetermined delay time when the input signal is transitioned to the first state. In this construction, even if the fuse is incompletely cut during a process of cutting the fuse, the pull-up driver or the pull-down driver is turned off, thus preventing unnecessary current flow in advance.
    Type: Application
    Filed: December 19, 2005
    Publication date: June 22, 2006
    Inventors: Dong-Jin Lim, Sang-Seok Kang, Byung-Heon Kwak, Jae-Hoon Joo, Chang-Hag Oh
  • Patent number: 6002629
    Abstract: Integrated circuit memory devices include an array of memory cells and a row address generator circuit which generates first and second different sequences of addresses during first and second refresh modes, respectively, and also repeats at least one of the addresses in the first sequence as an address in the second sequence when transitioning from the first refresh mode to the second refresh mode. The generator circuit may also perform the function of generating row addresses during the first and second refresh modes with the most significant bit of a row address being toggled with each consecutive row address during the first refresh mode. The first refresh mode may be a CAS-before-RAS refresh mode, the second refresh mode may be a self-refresh mode and the address in at least one of the first and second periods of the self-refresh mode may be equivalent to an address in the last period of a preceding CAS-before-RAS refresh mode when transitioning from the first refresh mode to the second refresh mode.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: December 14, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jeon-Kyu Kim, Chang-Hag Oh, Choong-Sun Park, Jeon-Hyoung Lee
  • Patent number: 5867434
    Abstract: Integrated circuit memory devices contain an array of active memory cells and at least one column of dummy memory cells having missing electrical connections to either a dummy bit line and/or respective storage electrodes. The dummy memory cells are provided with missing electrical connections so that formation of stray electrical "shorts" between storage electrodes of dummy and active memory cells during fabrication do not cause memory failures when the memory devices are installed. In particular, integrated circuit memory devices are provided which comprise an array of active DRAM memory cells and a column of dummy DRAM memory cells. The active DRAM memory cells each contain electrical connections to a respective active bit line and a respective storage electrode, but the dummy DRAM memory cells are each devoid of an electrical connection to a dummy bit line and/or a respective storage electrode. Accordingly, the formation of a stringer (e.g.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: February 2, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chang-hag Oh, Sang-seok Kang, Jeon-hyung Lee, Jin-seok Lee