Patents by Inventor Xiaonan Chen

Xiaonan Chen 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: 9876123
    Abstract: An apparatus includes a metal gate, a substrate material, and an oxide layer between the metal gate and the substrate material. The oxide layer includes a hafnium oxide layer contacting the metal gate and a silicon dioxide layer contacting the substrate material and contacting the hafnium oxide layer. The metal gate, the substrate material, and the oxide layer are included in a one-time programmable (OTP) memory device. The OTP memory device includes a transistor. A non-volatile state of the OTP memory device is based on a threshold voltage shift of the OTP memory device.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: January 23, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Xia Li, Jeffrey Junhao Xu, Xiao Lu, Bin Yang, Jun Yuan, Xiaonan Chen, Zhongze Wang
  • Publication number: 20170365339
    Abstract: Memory programming methods and memory systems are described. One example memory programming method includes first applying a first signal to a memory cell to attempt to program the memory cell to a desired state, wherein the first signal corresponds to the desired state, after the first applying, determining that the memory cell failed to place in the desired state, after the determining, second applying a second signal to the memory cell, wherein the second signal corresponds to another state which is different than the desired state, and after the second applying, third applying a third signal to the memory cell to program the memory cell to the desired state, wherein the third signal corresponds to the desired state. Additional method and apparatus are described.
    Type: Application
    Filed: August 30, 2017
    Publication date: December 21, 2017
    Applicant: Micron Technology, Inc.
    Inventors: Jonathan Strand, Adam Johnson, Xiaonan Chen, Durai Vishak Nirmal Ramaswamy
  • Patent number: 9812188
    Abstract: An apparatus includes a static random-access memory and circuitry configured to initiate a corrective action associated with the static random-access memory. The corrective action may be initiated based on a number of static random-access memory cells that have a particular state responsive to a power-up of the static random-access memory.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: November 7, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Niladri Narayan Mojumder, Zhongze Wang, Xiaonan Chen, Stanley Seungchul Song, Choh Fei Yeap
  • Patent number: 9773551
    Abstract: Memory programming methods and memory systems are described. One example memory programming method includes first applying a first signal to a memory cell to attempt to program the memory cell to a desired state, wherein the first signal corresponds to the desired state, after the first applying, determining that the memory cell failed to place in the desired state, after the determining, second applying a second signal to the memory cell, wherein the second signal corresponds to another state which is different than the desired state, and after the second applying, third applying a third signal to the memory cell to program the memory cell to the desired state, wherein the third signal corresponds to the desired state. Additional method and apparatus are described.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: September 26, 2017
    Assignee: Micron Technology, Inc.
    Inventors: Jonathan Strand, Adam Johnson, Xiaonan Chen, Durai Vishak Nirmal Ramaswamy
  • Patent number: 9576658
    Abstract: Embodiments disclosed herein may relate to programming a memory cell with a programming pulse that comprises a quenching period having different portions. The memory cell may have more than two possible programmed states, where each programmed state of the memory cell includes a different fraction of amorphous material. A memory element may be melted and then quenched. The fraction of amorphous material, and thus the programmed state, may be controlled by selecting one of multiple quenching periods for the programming pulse.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: February 21, 2017
    Assignee: Micron Technology, Inc.
    Inventor: Xiaonan Chen
  • Patent number: 9576801
    Abstract: Non-volatile memory devices and logic devices are fabricated using processes compatible with high dielectric constant/metal gate (HK/MG) processes for increased cell density and larger scale integration. A doped oxide layer, such as a silicon-doped hafnium oxide (HfO2) layer, is implemented as a ferroelectric dipole layer in a nonvolatile memory device.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: February 21, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Xia Li, Jeffrey Junhao Xu, Zhongze Wang, Bin Yang, Xiaonan Chen, Yu Lu
  • Patent number: 9508439
    Abstract: An apparatus includes a multiple time programmable (MTP) memory device. The MTP memory device includes a metal gate, a substrate material, and an oxide structure between the metal gate and the substrate material. The oxide structure includes a hafnium oxide layer and a silicon dioxide layer. The hafnium oxide layer is in contact with the metal gate and in contact with the silicon dioxide layer. The silicon dioxide layer is in contact with the substrate material. The MTP device includes a transistor, and a non-volatile state of the MTP memory device is based on a threshold voltage of the transistor.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: November 29, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Xia Li, Jeffrey Junhao Xu, Xiao Lu, Matthew Michael Nowak, Seung Hyuk Kang, Xiaonan Chen, Zhongze Wang, Yu Lu
  • Patent number: 9496048
    Abstract: An OTP memory array includes a plurality of differential P-channel metal oxide semiconductor (PMOS) OTP memory cells programmable and readable in predetermined states of program and read operations, and is capable of providing sufficient margins against global process variations and temperature variations while being compatible with standard logic fin-shaped field effect transistor (FinFET) processes to obviate the need for additional masks and costs associated with additional masks.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: November 15, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Xiaonan Chen, Zhongze Wang, Xia Li
  • Patent number: 9449709
    Abstract: A volatile and one-time program (OTP) compatible asymmetric memory cell may include a first pull-up transistor having a first threshold voltage. The asymmetric memory cell may also include a second pull-up transistor having a second threshold voltage that differs from the first threshold voltage. The asymmetric memory cell may further include a switch coupled to a well of the first pull-up transistor and the second pull-up transistor to alternate between a program voltage (Vpg) and a power supply voltage. The asymmetric memory cell may also include a peripheral switching circuit to control programming of the asymmetric memory cell.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: September 20, 2016
    Assignee: QUALCOMM INCORPORATED
    Inventors: Xia Li, Xiaonan Chen, Niladri Narayan Mojumder, Zhongze Wang, Weidan Li
  • Publication number: 20160268002
    Abstract: An OTP memory array includes a plurality of differential P-channel metal oxide semiconductor (PMOS) OTP memory cells programmable and readable in predetermined states of program and read operations, and is capable of providing sufficient margins against global process variations and temperature variations while being compatible with standard logic fin-shaped field effect transistor (FinFET) processes to obviate the need for additional masks and costs associated with additional masks.
    Type: Application
    Filed: March 12, 2015
    Publication date: September 15, 2016
    Inventors: Xiaonan CHEN, Zhongze WANG, Xia LI
  • Publication number: 20160254056
    Abstract: A semiconductor device for a one-time programmable (OTP) memory according to some examples of the disclosure includes a gate, a dielectric region below the gate, a source terminal below the dielectric region and offset to one side, a drain terminal below the dielectric region and offset to an opposite side from the source terminal, a drain side charge trap in the dielectric region capable of programming the semiconductor device, and a source side charge trap in the dielectric region opposite the drain side charge trap and capable of programming the semiconductor device.
    Type: Application
    Filed: February 27, 2015
    Publication date: September 1, 2016
    Inventors: Xia LI, Xiao LU, Xiaonan CHEN, Zhongze WANG
  • Patent number: 9431097
    Abstract: A method of operation of a static random access memory (SRAM) storage element includes programming a value to the SRAM storage element prior to a power-down event. The method further includes, in response to a power-on event at the SRAM storage element after the power-down event, increasing a supply voltage of the SRAM storage element and sensing a state of the SRAM storage element to determine the value programmed to the SRAM storage element prior to the power-down event. In a particular example, an apparatus includes the SRAM storage element and control circuitry coupled to the SRAM storage element. The control circuitry may be configured to program the value to the SRAM storage element, to increase the supply voltage, and to sense the state of the SRAM storage element to determine the value programmed to the SRAM storage element prior to the power-down event.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: August 30, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Xiaonan Chen, Zhongze Wang, Xia Li
  • Publication number: 20160247554
    Abstract: An apparatus includes a static random-access memory and circuitry configured to initiate a corrective action associated with the static random-access memory. The corrective action may be initiated based on a number of static random-access memory cells that have a particular state responsive to a power-up of the static random-access memory.
    Type: Application
    Filed: February 25, 2015
    Publication date: August 25, 2016
    Inventors: Niladri Narayan Mojumder, Zhongze Wang, Xiaonan Chen, Stanley Seungchul Song, Choh Fei Yeap
  • Patent number: 9419220
    Abstract: A method of forming a resistive memory element comprises forming an oxide material over a first electrode. The oxide material is exposed to a plasma process to form a treated oxide material. A second electrode is formed on the treated oxide material. Additional methods of forming a resistive memory element, as well as related resistive memory elements, resistive memory cells, and resistive memory devices are also described.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: August 16, 2016
    Assignee: Micron Technology, Inc.
    Inventors: D. V. Nirmal Ramaswamy, Sanh D. Tang, Alessandro Torsi, Muralikrishnan Balakrishnan, Xiaonan Chen, John K. Zahurak
  • Patent number: 9413349
    Abstract: Aspects disclosed in the detailed description include high-k (HK)/metal gate (MG) (HK/MG) multi-time programmable (MTP) switching devices, and related systems and methods. One type of HK/MG MTP switching device is an MTP metal-oxide semiconductor (MOS) field-effect transistor (MOSFET). When the MTP MOSFET is programmed, a charge trap may build up in the MTP MOSFET due to a switching electrical current induced by a switching voltage. The charge trap reduces the switching window and endurance of the MTP MOSFET, thus reducing reliability in accessing the information stored in the MTP MOSFET. In this regard, an HK/MG MTP switching device comprising the MTP MOSFET is configured to eliminate the switching electrical current when the MTP MOSFET is programmed. By eliminating the switching electrical current, it is possible to avoid a charge trap in the MTP MOSFET, thus restoring the switching window and endurance of the MTP MOSFET for reliable information access.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: August 9, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Xia Li, Xiao Lu, Xiaonan Chen, Zhongze Wang, Choh Fei Yeap
  • Publication number: 20160180925
    Abstract: A method of operation of a static random access memory (SRAM) storage element includes programming a value to the SRAM storage element prior to a power-down event. The method further includes, in response to a power-on event at the SRAM storage element after the power-down event, increasing a supply voltage of the SRAM storage element and sensing a state of the SRAM storage element to determine the value programmed to the SRAM storage element prior to the power-down event. In a particular example, an apparatus includes the SRAM storage element and control circuitry coupled to the SRAM storage element. The control circuitry may be configured to program the value to the SRAM storage element, to increase the supply voltage, and to sense the state of the SRAM storage element to determine the value programmed to the SRAM storage element prior to the power-down event.
    Type: Application
    Filed: December 22, 2014
    Publication date: June 23, 2016
    Inventors: Xiaonan Chen, Zhongze Wang, Xia Li
  • Publication number: 20160180932
    Abstract: Embodiments disclosed herein may relate to programming a memory cell with a programming pulse that comprises a quenching period having different portions. The memory cell may have more than two possible programmed states, where each programmed state of the memory cell includes a different fraction of amorphous material. A memory element may be melted and then quenched. The fraction of amorphous material, and thus the programmed state, may be controlled by selecting one of multiple quenching periods for the programming pulse.
    Type: Application
    Filed: February 25, 2016
    Publication date: June 23, 2016
    Inventor: Xiaonan Chen
  • Publication number: 20160155748
    Abstract: Non-volatile memory devices and logic devices are fabricated using processes compatible with high dielectric constant/metal gate (HK/MG) processes for increased cell density and larger scale integration.
    Type: Application
    Filed: December 1, 2014
    Publication date: June 2, 2016
    Inventors: Xia LI, Jeffrey Junhao XU, Zhongze WANG, Bin YANG, Xiaonan CHEN, Yu LU
  • Publication number: 20160118119
    Abstract: Memory programming methods and memory systems are described. One example memory programming method includes first applying a first signal to a memory cell to attempt to program the memory cell to a desired state, wherein the first signal corresponds to the desired state, after the first applying, determining that the memory cell failed to place in the desired state, after the determining, second applying a second signal to the memory cell, wherein the second signal corresponds to another state which is different than the desired state, and after the second applying, third applying a third signal to the memory cell to program the memory cell to the desired state, wherein the third signal corresponds to the desired state. Additional method and apparatus are described.
    Type: Application
    Filed: January 4, 2016
    Publication date: April 28, 2016
    Applicant: Micron Technology, Inc.
    Inventors: Jonathan Strand, Adam Johnson, Xiaonan Chen, Durai Vishak Nirmal Ramaswamy
  • Patent number: 9281062
    Abstract: Embodiments disclosed herein may relate to programming a memory cell with a programming pulse that comprises a quenching period having different portions.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: March 8, 2016
    Assignee: MICRON TECHNOLOGY, INC.
    Inventor: Xiaonan Chen