Patents by Inventor Ahn Choi

Ahn Choi 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: 12203980
    Abstract: A wafer-level method of testing an integrated circuit (IC) device includes: (i) applying a plurality of test operation signals to a wafer containing the IC device, (ii) generating a test enable signal in response to detecting, on the wafer, a toggling of at least one of the plurality of test operation signals, and then (iii) testing at least a portion of the IC device in response to the generating the test enable signal. The generating may also include generating a test enable signal in response to detecting, on the wafer, an inactive-to-active transition of a toggle detection signal.
    Type: Grant
    Filed: September 21, 2023
    Date of Patent: January 21, 2025
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ahn Choi, Reum Oh
  • Publication number: 20240012045
    Abstract: A wafer-level method of testing an integrated circuit (IC) device includes: (i) applying a plurality of test operation signals to a wafer containing the IC device, (ii) generating a test enable signal in response to detecting, on the wafer, a toggling of at least one of the plurality of test operation signals, and then (iii) testing at least a portion of the IC device in response to the generating the test enable signal. The generating may also include generating a test enable signal in response to detecting, on the wafer, an inactive-to-active transition of a toggle detection signal.
    Type: Application
    Filed: September 21, 2023
    Publication date: January 11, 2024
    Inventors: Ahn Choi, Reum Oh
  • Patent number: 11867751
    Abstract: A wafer-level method of testing an integrated circuit (IC) device includes: (i) applying a plurality of test operation signals to a wafer containing the IC device, (ii) generating a test enable signal in response to detecting, on the wafer, a toggling of at least one of the plurality of test operation signals, and then (iii) testing at least a portion of the IC device in response to the generating the test enable signal. The generating may also include generating a test enable signal in response to detecting, on the wafer, an inactive-to-active transition of a toggle detection signal.
    Type: Grant
    Filed: July 25, 2022
    Date of Patent: January 9, 2024
    Inventors: Ahn Choi, Reum Oh
  • Publication number: 20220357393
    Abstract: A wafer-level method of testing an integrated circuit (IC) device includes: (i) applying a plurality of test operation signals to a wafer containing the IC device, (ii) generating a test enable signal in response to detecting, on the wafer, a toggling of at least one of the plurality of test operation signals, and then (iii) testing at least a portion of the IC device in response to the generating the test enable signal. The generating may also include generating a test enable signal in response to detecting, on the wafer, an inactive-to-active transition of a toggle detection signal.
    Type: Application
    Filed: July 25, 2022
    Publication date: November 10, 2022
    Inventors: Ahn Choi, Reum Oh
  • Patent number: 11435397
    Abstract: A wafer-level method of testing an integrated circuit (IC) device includes: (i) applying a plurality of test operation signals to a wafer containing the IC device, (ii) generating a test enable signal in response to detecting, on the wafer, a toggling of at least one of the plurality of test operation signals, and then (iii) testing at least a portion of the IC device in response to the generating the test enable signal. The generating may also include generating a test enable signal in response to detecting, on the wafer, an inactive-to-active transition of a toggle detection signal.
    Type: Grant
    Filed: October 28, 2019
    Date of Patent: September 6, 2022
    Inventors: Ahn Choi, Reum Oh
  • Publication number: 20200371157
    Abstract: A wafer-level method of testing an integrated circuit (IC) device includes: (i) applying a plurality of test operation signals to a wafer containing the IC device, (ii) generating a test enable signal in response to detecting, on the wafer, a toggling of at least one of the plurality of test operation signals, and then (iii) testing at least a portion of the IC device in response to the generating the test enable signal. The generating may also include generating a test enable signal in response to detecting, on the wafer, an inactive-to-active transition of a toggle detection signal.
    Type: Application
    Filed: October 28, 2019
    Publication date: November 26, 2020
    Inventors: Ahn Choi, Reum Oh
  • Patent number: 10622088
    Abstract: A stacked memory device includes a buffer die, a plurality of memory dies stacked on the buffer die and a plurality of through silicon vias (TSVs). The buffer die communicates with an external device. The TSVs extend through the plurality of memory dies to connect to the buffer die. Each of memory dies includes a memory cell array which includes a plurality of dynamic memory cells coupled to a plurality of word-lines and a plurality of bit-lines. The buffer die includes a test circuit, and the test circuit, in a test mode, performs a test on the dynamic memory cells of a target memory die corresponding to one of the memory dies and store, an address of a memory cell row including at least one defective cell, in at least one column decoder of other memory dies of except the target memory die.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: April 14, 2020
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Ahn Choi
  • Publication number: 20200027521
    Abstract: A stacked memory device includes a buffer die, a plurality of memory dies stacked on the buffer die and a plurality of through silicon vias (TSVs). The buffer die communicates with an external device. The TSVs extend through the plurality of memory dies to connect to the buffer die. Each of memory dies includes a memory cell array which includes a plurality of dynamic memory cells coupled to a plurality of word-lines and a plurality of bit-lines. The buffer die includes a test circuit, and the test circuit, in a test mode, performs a test on the dynamic memory cells of a target memory die corresponding to one of the memory dies and store, an address of a memory cell row including at least one defective cell, in at least one column decoder of other memory dies of except the target memory die.
    Type: Application
    Filed: January 11, 2019
    Publication date: January 23, 2020
    Applicant: Samsung Electronics Co., Ltd.
    Inventor: Ahn Choi
  • Publication number: 20150049546
    Abstract: A plurality of fuse cells includes a first fuse cell and a second fuse cell. Each of the first and second fuse cells includes a first anti-fuse and a second anti-fuse. A method of programming the fuse cells includes rupturing the first anti-fuse of the first fuse cell based on first data loaded to a program control circuit. The method includes rupturing the second anti-fuse of the first fuse cell before loading second data to the program control circuit. The second data is for rupturing the first anti-fuse of the second fuse cell or the second anti-fuse of the second fuse cell.
    Type: Application
    Filed: June 17, 2014
    Publication date: February 19, 2015
    Inventor: Ahn Choi
  • Publication number: 20060287561
    Abstract: A process for increasing the production of light olefin hydrocarbons from a hydrocarbon feedstock. A process for producing an aromatic hydrocarbon mixture and liquefied petroleum gas (LPG) from a hydrocarbon mixture, and a process for producing a hydrocarbon feedstock which is capable of being used as a feedstock in the former process, that is to say, a fluidized catalytic cracking (FCC) process, a catalytic reforming process, and/or a pyrolysis process, are integrated, thereby it is possible to increase the production of C2-C4 light olefin hydrocarbons.
    Type: Application
    Filed: September 12, 2005
    Publication date: December 21, 2006
    Applicant: SK CORPORATION
    Inventors: Sun Choi, Seung Oh, Kyoung Sung, Jong Lee, Sin Kang, Yong Kim, Byeung Lim, Ahn Choi, Byoung Chang
  • Publication number: 20060058562
    Abstract: A porous solid acid catalyst for producing light olefins is prepared through pillaring and a solid state reaction of a raw material mixture. The catalyst is made of a porous material having a crystalline structure that is different from that of the raw material mixture. The catalyst exhibits excellent catalytic activity (i.e., conversion and selectivity) in the production of light olefins from hydrocarbon feeds such as full range naphthas.
    Type: Application
    Filed: September 8, 2005
    Publication date: March 16, 2006
    Applicants: SK CORPORATION, KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY
    Inventors: Sun Choi, Deuk Park, Suk Kim, Ahn Choi, Hee Kim, Yong Park, Chul Lee, Won Choi, Sang Han, Jeong Kim
  • Publication number: 20050235314
    Abstract: A method for implementing an Electronic Program Guide (EPG) A method for implementing a digital Electronic Program guide (EPG) includes the steps of: displaying a date/time selection image including a plurality of cells; and providing a user with an EPG associated with a date and time corresponding to a specific cell if the user designates the specific cell contained in the date/time selection image. The method allows the user to select EPG information corresponding to desired date and time using an additional window, such that the user can directly recognize EPG information associated with a desired date and time zone, and can conveniently search for the EPG information.
    Type: Application
    Filed: March 21, 2005
    Publication date: October 20, 2005
    Inventor: Ahn Choi