Patents by Inventor Wah K. Loh

Wah K. Loh 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: 9208899
    Abstract: An integrated circuit on-chip parametric (OCP) test structure includes a static random access memory (SRAM) universal test structure (UTS) having UTS ports and an OCP controller configured to determine first and second UTS ports of the SRAM UTS for independent connection to first and second on-chip test pads, respectively. The integrated circuit OCP test structure further includes a UTS OCP router connected to the OCP controller and configured to connect the first and second UTS ports of the SRAM UTS to the first and second on-chip test pads, respectively. Methods of operating an integrated circuit OCP test structure and OCP testing of an integrated circuit are also included.
    Type: Grant
    Filed: May 5, 2010
    Date of Patent: December 8, 2015
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Xiaowei Deng, Wah K. Loh
  • Patent number: 8437213
    Abstract: Embodiments of the present disclosure provide an integrated circuit including a functional memory and methods of characterizing a component or a defect of a memory cell in the functional memory. In one embodiment, the functional memory includes row and column periphery units having periphery sourcing and sinking voltage supply ports, an array of memory cells organized in rows and columns and a word line controlled by a word line driver that provides row access to a memory cell of the array. Additionally, the functional memory also includes a bit line controlled by a direct bit line access circuit that provides direct bit line access to the memory cell through a bit line analog access port and an independent voltage supply port.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: May 7, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Xiaowei Deng, Wah K. Loh, Theodore W. Houston
  • Publication number: 20110273946
    Abstract: An integrated circuit on-chip parametric (OCP) test structure includes a static random access memory (SRAM) universal test structure (UTS) having UTS ports and an OCP controller configured to determine first and second UTS ports of the SRAM UTS for independent connection to first and second on-chip test pads, respectively. The integrated circuit OCP test structure further includes a UTS OCP router connected to the OCP controller and configured to connect the first and second UTS ports of the SRAM UTS to the first and second on-chip test pads, respectively. Methods of operating an integrated circuit OCP test structure and OCP testing of an integrated circuit are also included.
    Type: Application
    Filed: May 5, 2010
    Publication date: November 10, 2011
    Applicant: Texas Instruments Incorporated
    Inventors: Xiaowei Deng, Wah K. Loh
  • Publication number: 20090175113
    Abstract: Embodiments of the present disclosure provide an integrated circuit including a functional memory and methods of characterizing a component or a defect of a memory cell in the functional memory. In one embodiment, the functional memory includes row and column periphery units having periphery sourcing and sinking voltage supply ports, an array of memory cells organized in rows and columns and a word line controlled by a word line driver that provides row access to a memory cell of the array. Additionally, the functional memory also includes a bit line controlled by a direct bit line access circuit that provides direct bit line access to the memory cell through a bit line analog access port and an independent voltage supply port.
    Type: Application
    Filed: December 31, 2008
    Publication date: July 9, 2009
    Applicant: Texas Instruments Incorporated
    Inventors: Xiaowei Deng, Wah K. Loh, Theodore W. Houston
  • Patent number: 5923599
    Abstract: In a built-in-self-test (BIST) unit or a memory unit, an address limits unit is provided which, prior to initiation of the test procedures, has start and stop addresses stored therein. Upon the initiation of the test procedures by the BIST unit, the start address of the address limits unit is transferred to the address counters units wherein the start address serves as the initial test address. The stop address is transferred to the address counters unit wherein the stop address will be compared with the current address. When the stop address and the current address match, the test procedure being executed by the BIST unit will be terminated. In this manner, any subarray in the memory unit can be selected for test.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: July 13, 1999
    Assignee: Texas Instruments Incorporated
    Inventors: Kuong H. Hii, Danny R. Cline, Theo J. Powell, Wah K. Loh
  • Patent number: 5309446
    Abstract: A test validation process for a semiconductor device applies signals indicating a test mode to the semiconductor device. The device produces output signals and the output signals are read to determine whether the device is in the indicated test mode. The test mode is conducted by operating the device. The output signals are read upon completion of the test mode to determine if the device is still in the indicated test mode. The test validation method is useful for memory chips and particularly Dynamic Random Access Memory, DRAM, devices that are burn-in stress tested.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: May 3, 1994
    Assignee: Texas Instruments Incorporated
    Inventors: Danny R. Cline, Wah K. Loh, Adin E. Hyslop, Hugh P. McAdams, Chok Y. Hung
  • Patent number: 5220534
    Abstract: A circuit for providing a bias to the substrate of a dynamic memory device having a memory array and peripheral circuitry formed in a semiconductor substrate is disclosed. The circuit includes a low power pump and oscillator to provide a substrate bias in a memory standby mode. A high power pump and oscillator is included to provide a substrate bias when the memory is active. A booster oscillator and pump to provide a substrate bias when the memory is active and when the substrate voltage level is greater than a preset level is also provided. A method for contolling the voltage level of the substrate upon which a dynamic memory device is formed is also disclosed.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: June 15, 1993
    Assignee: Texas Instruments, Incorporated
    Inventors: Wah K. Loh, Narasimhan Iyengar, Danny R. Cline, Wah K. Loh, Hugh P. McAdams
  • Patent number: 5200364
    Abstract: An integrated circuit device is disclosed. The device includes a first leadframe power supply bus and a second leadframe power supply bus that each have portions separate from and adjacent to one another that lie between a first plurality of leadfingers and a second plurality of leadfingers. An electronic device is connected to the first leadframe power supply bus and to the second leadframe power supply bus. Another electronic device can be connected to the first leadframe power supply bus and to the second leadframe bus. Exemplary of the electronic devices are a de-coupling capacitor and a capacitor for high frequency noise suppression. A semiconductor die is attached to the power supply busses. A substance encapsulates the components so that an integrated semiconductor chip is formed. A method of making an integrated circuit device is also disclosed.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: April 6, 1993
    Assignee: Texas Instruments Incorporated
    Inventor: Wah K. Loh
  • Patent number: 5115298
    Abstract: An integrated circuit device is disclosed. The device includes a first leadframe power supply bus and a second leadframe power supply bus that each have portions separate from and adjacent to one another that lie between a first plurality of leadfingers and a second plurality of leadfingers. An electronic device is connected to the first leadframe power supply bus and to the second leadframe power supply bus. Another electronic device can be connected to the first leadframe power supply bus and to the second leadframe bus. Exemplary of the electronic devices are a de-coupling capacitor and a capacitor for high frequency noise suppression. A semiconductor die is attached to the power supply busses. A substance encapsulates the components so that an integrated semiconductor chip is formed. A method of making an integrated circuit device is also disclosed.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: May 19, 1992
    Assignee: Texas Instruments Incorporated
    Inventor: Wah K. Loh