Patents by Inventor Chang Hua Siau

Chang Hua Siau 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: 20200013460
    Abstract: Systems, integrated circuits, and methods to utilize access signals to facilitate memory operations in scaled arrays of memory elements are described. In at least some embodiments, a non-volatile memory device can include a cross-point array having resistive memory elements and line driver. The line driver can be configured to access a resistive memory element in the cross-point array.
    Type: Application
    Filed: July 15, 2019
    Publication date: January 9, 2020
    Inventors: Christophe Chevallier, Chang Hua Siau
  • Publication number: 20190392895
    Abstract: A system includes a cross-point memory array and a decoder circuit coupled to the cross-point memory array. The decoder circuit includes a predecoder having predecode logic to generate a control signal and a level shifter circuit to generate a voltage signal. The decoder circuit further includes a post-decoder coupled to the predecoder, the post-decoder including a first stage and a second stage coupled to the first stage, the control signal to control the first stage and the second stage to route the voltage signal through the first stage and the second stage to a selected conductive array line of a plurality of conductive array lines coupled to a memory array.
    Type: Application
    Filed: July 2, 2019
    Publication date: December 26, 2019
    Inventors: Christophe Chevallier, Chang Hua Siau
  • Publication number: 20190279712
    Abstract: A memory array includes wordlines, local bitlines, two-terminal memory elements, global bitlines, and local-to-global bitline pass gates and gain stages. The memory elements are formed between the wordlines and local bitlines. Each local bitline is selectively coupled to an associated global bitline, by way of an associated local-to-global bitline pass gate. During a read operation when a memory element of a local bitline is selected to be read, a local-to-global gain stage is configured to amplify a signal on or passing through the local bitline to an amplified signal on or along an associated global bitline. The amplified signal, which in one embodiment is dependent on the resistive state of the selected memory element, is used to rapidly determine the memory state stored by the selected memory element. The global bit line and/or the selected local bit line can be biased to compensate for the Process Voltage Temperature (PVT) variation.
    Type: Application
    Filed: March 8, 2019
    Publication date: September 12, 2019
    Inventors: Chang Hua Siau, Bruce Lynn Bateman
  • Publication number: 20190252011
    Abstract: Embodiments of the invention relate generally to semiconductors and memory technology, and more particularly, to systems, integrated circuits, and methods to implement circuits configured to compensate for parameter variations in layers of memory by adjusting access signals during memory operations. In some embodiments, memory cells are based on third dimensional memory technology. In at least some embodiments, an integrated circuit includes multiple layers of memory, a layer including sub-layers of semiconductor material. The integrated circuit also includes an access signal generator configured to generate an access signal to facilitate an access operation, and a characteristic adjuster configured to adjust the access signal for each layer in the multiple layers of memory.
    Type: Application
    Filed: February 14, 2019
    Publication date: August 15, 2019
    Inventors: Christophe Chevallier, Seow Fong Lim, Chang Hua Siau
  • Patent number: 10354726
    Abstract: Systems, integrated circuits, and methods to utilize access signals to facilitate memory operations in scaled arrays of memory elements are described. In at least some embodiments, a non-volatile memory device can include a cross-point array having resistive memory elements and line driver. The line driver can be configured to access a resistive memory element in the cross-point array.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: July 16, 2019
    Assignee: Unity Semiconductor Corporation
    Inventors: Christophe Chevallier, Chang Hua Siau
  • Patent number: 10347332
    Abstract: A system includes a cross-point memory array and a decoder circuit coupled to the cross-point memory array. The decoder circuit includes a predecoder having predecode logic to generate a control signal and a level shifter circuit to generate a voltage signal. The decoder circuit further includes a post-decoder coupled to the predecoder, the post-decoder including a first stage and a second stage coupled to the first stage, the control signal to control the first stage and the second stage to route the voltage signal through the first stage and the second stage to a selected conductive array line of a plurality of conductive array lines coupled to a memory array.
    Type: Grant
    Filed: June 11, 2018
    Date of Patent: July 9, 2019
    Assignee: Unity Semiconductor Corporation
    Inventors: Christophe Chevallier, Chang Hua Siau
  • Publication number: 20190103161
    Abstract: Systems, integrated circuits, and methods to utilize access signals to facilitate memory operations in scaled arrays of memory elements are described. In at least some embodiments, a non-volatile memory device can include a cross-point array having resistive memory elements and line driver. The line driver can be configured to access a resistive memory element in the cross-point array.
    Type: Application
    Filed: September 10, 2018
    Publication date: April 4, 2019
    Inventors: Christophe Chevallier, Chang Hua Siau
  • Patent number: 10229739
    Abstract: A memory array includes wordlines, local bitlines, two-terminal memory elements, global bitlines, and local-to-global bitline pass gates and gain stages. The memory elements are formed between the wordlines and local bitlines. Each local bitline is selectively coupled to an associated global bitline, by way of an associated local-to-global bitline pass gate. During a read operation when a memory element of a local bitline is selected to be read, a local-to-global gain stage is configured to amplify a signal on or passing through the local bitline to an amplified signal on or along an associated global bitline. The amplified signal, which in one embodiment is dependent on the resistive state of the selected memory element, is used to rapidly determine the memory state stored by the selected memory element. The global bit line and/or the selected local bit line can be biased to compensate for the Process Voltage Temperature (PVT) variation.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: March 12, 2019
    Assignee: Unity Semiconductor Corporation
    Inventors: Chang Hua Siau, Bruce Lynn Bateman
  • Patent number: 10210917
    Abstract: Embodiments of the invention relate generally to semiconductors and memory technology, and more particularly, to systems, integrated circuits, and methods to implement circuits configured to compensate for parameter variations in layers of memory by adjusting access signals during memory operations. In some embodiments, memory cells are based on third dimensional memory technology. In at least some embodiments, an integrated circuit includes multiple layers of memory, a layer including sub-layers of semiconductor material. The integrated circuit also includes an access signal generator configured to generate an access signal to facilitate an access operation, and a characteristic adjuster configured to adjust the access signal for each layer in the multiple layers of memory.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: February 19, 2019
    Assignee: Unity Semiconductor Corporation
    Inventors: Christophe Chevallier, Seow Fong Lim, Chang Hua Siau
  • Publication number: 20190013070
    Abstract: A system includes a cross-point memory array and a decoder circuit coupled to the cross-point memory array. The decoder circuit includes a predecoder having predecode logic to generate a control signal and a level shifter circuit to generate a voltage signal. The decoder circuit further includes a post-decoder coupled to the predecoder, the post-decoder including a first stage and a second stage coupled to the first stage, the control signal to control the first stage and the second stage to route the voltage signal through the first stage and the second stage to a selected conductive array line of a plurality of conductive array lines coupled to a memory array.
    Type: Application
    Filed: June 11, 2018
    Publication date: January 10, 2019
    Inventors: Christophe Chevallier, Chang Hua Siau
  • Publication number: 20180364931
    Abstract: Embodiments of the invention relate generally to semiconductors and memory technology, and more particularly, to systems, integrated circuits, and methods to preserve states of memory elements in association with data operations using variable access signal magnitudes for other memory elements, such as implemented in third dimensional memory technology. In some embodiments, a memory device can include a cross-point array with resistive memory elements. An access signal generator can modify a magnitude of a signal to generate a modified magnitude for the signal to access a resistive memory element associated with a word line and a subset of bit lines. A tracking signal generator is configured to track the modified magnitude of the signal and to apply a tracking signal to other resistive memory elements associated with other subsets of bit lines, the tracking signal having a magnitude at a differential amount from the modified magnitude of the signal.
    Type: Application
    Filed: June 26, 2018
    Publication date: December 20, 2018
    Inventor: Chang Hua Siau
  • Publication number: 20180366194
    Abstract: A memory array includes wordlines, local bitlines, two-terminal memory elements, global bitlines, and local-to-global bitline pass gates and gain stages. The memory elements are formed between the wordlines and local bitlines. Each local bitline is selectively coupled to an associated global bitline, by way of an associated local-to-global bitline pass gate. During a read operation when a memory element of a local bitline is selected to be read, a local-to-global gain stage is configured to amplify a signal on or passing through the local bitline to an amplified signal on or along an associated global bitline. The amplified signal, which in one embodiment is dependent on the resistive state of the selected memory element, is used to rapidly determine the memory state stored by the selected memory element. The global bit line and/or the selected local bit line can be biased to compensate for the Process Voltage Temperature (PVT) variation.
    Type: Application
    Filed: January 11, 2018
    Publication date: December 20, 2018
    Inventors: Chang Hua Siau, Bruce Lynn Bateman
  • Publication number: 20180342268
    Abstract: Embodiments relate generally to semiconductors and memory technology, and more particularly, to systems, integrated circuits, and methods to implement a memory architecture that includes local bit lines for accessing subsets of memory elements, such as memory elements based on third dimensional memory technology. In at least some embodiments, an integrated circuit includes a cross-point memory array formed above a logic layer. The cross-point memory array includes X-lines and Y-lines, of which at least one Y-line includes groups of Y-line portions. Each of the Y-line portions can be arranged in parallel with other Y-line portions within a group of the Y-line portions. Also included are memory elements disposed between a subset of the X-lines and the group of the Y-line portions. In some embodiments, a decoder is configured to select a Y-line portion from the group of Y-line portions to access a subset of the memory elements.
    Type: Application
    Filed: May 18, 2018
    Publication date: November 29, 2018
    Inventors: Chang Hua Siau, Christophe Chevallier, Darrell Rinerson, Seow Fong Lim, Sri Rama Namala
  • Patent number: 10074420
    Abstract: Systems, integrated circuits, and methods to utilize access signals to facilitate memory operations in scaled arrays of memory elements are described. In at least some embodiments, a non-volatile memory device can include a cross-point array having resistive memory elements and line driver. The line driver can be configured to access a resistive memory element in the cross-point array.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: September 11, 2018
    Assignee: Unity Semiconductor Corporation
    Inventors: Christophe Chevallier, Chang Hua Siau
  • Publication number: 20180226110
    Abstract: Embodiments of the invention relate generally to semiconductors and memory technology, and more particularly, to systems, integrated circuits, and methods to implement circuits configured to compensate for parameter variations in layers of memory by adjusting access signals during memory operations. In some embodiments, memory cells are based on third dimensional memory technology. In at least some embodiments, an integrated circuit includes multiple layers of memory, a layer including sub-layers of semiconductor material. The integrated circuit also includes an access signal generator configured to generate an access signal to facilitate an access operation, and a characteristic adjuster configured to adjust the access signal for each layer in the multiple layers of memory.
    Type: Application
    Filed: January 11, 2018
    Publication date: August 9, 2018
    Inventors: Christophe Chevallier, Seow Fong Lim, Chang Hua Siau
  • Patent number: 10031686
    Abstract: Embodiments of the invention relate generally to semiconductors and memory technology, and more particularly, to systems, integrated circuits, and methods to preserve states of memory elements in association with data operations using variable access signal magnitudes for other memory elements, such as implemented in third dimensional memory technology. In some embodiments, a memory device can include a cross-point array with resistive memory elements. An access signal generator can modify a magnitude of a signal to generate a modified magnitude for the signal to access a resistive memory element associated with a word line and a subset of bit lines. A tracking signal generator is configured to track the modified magnitude of the signal and to apply a tracking signal to other resistive memory elements associated with other subsets of bit lines, the tracking signal having a magnitude at a differential amount from the modified magnitude of the signal.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: July 24, 2018
    Assignee: Unity Semiconductor Corporation
    Inventor: Chang Hua Siau
  • Publication number: 20180197604
    Abstract: A memory array includes wordlines, local bitlines, two-terminal memory elements, global bitlines, and local-to-global bitline pass gates and gain stages. The memory elements are formed between the wordlines and local bitlines. Each local bitline is selectively coupled to an associated global bitline, by way of an associated local-to-global bitline pass gate. During a read operation when a memory element of a local bitline is selected to be read, a local-to-global gain stage is configured to amplify a signal on or passing through the local bitline to an amplified signal on or along an associated global bitline. The amplified signal, which in one embodiment is dependent on the resistive state of the selected memory element, is used to rapidly determine the memory state stored by the selected memory element. The global bit line and/or the selected local bit line can be biased to compensate for the Process Voltage Temperature (PVT) variation.
    Type: Application
    Filed: January 11, 2018
    Publication date: July 12, 2018
    Inventors: Chang Hua Siau, Bruce Lynn Bateman
  • Patent number: 10002646
    Abstract: Embodiments relate generally to semiconductors and memory technology, and more particularly, to systems, integrated circuits, and methods to implement a memory architecture that includes local bit lines for accessing subsets of memory elements, such as memory elements based on third dimensional memory technology. In at least some embodiments, an integrated circuit includes a cross-point memory array formed above a logic layer. The cross-point memory array includes X-lines and Y-lines, of which at least one Y-line includes groups of Y-line portions. Each of the Y-line portions can be arranged in parallel with other Y-line portions within a group of the Y-line portions. Also included are memory elements disposed between a subset of the X-lines and the group of the Y-line portions. In some embodiments, a decoder is configured to select a Y-line portion from the group of Y-line portions to access a subset of the memory elements.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: June 19, 2018
    Assignee: Unity Semiconductor Corporation
    Inventors: Chang Hua Siau, Christophe Chevallier, Darrell Rinerson, Seow Fong Lim, Sri Rama Namala
  • Patent number: 9997241
    Abstract: A system includes a cross-point memory array and a decoder circuit coupled to the cross-point memory array. The decoder circuit includes a predecoder having predecode logic to generate a control signal and a level shifter circuit to generate a voltage signal. The decoder circuit further includes a post-decoder coupled to the predecoder, the post-decoder including a first stage and a second stage coupled to the first stage, the control signal to control the first stage and the second stage to route the voltage signal through the first stage and the second stage to a selected conductive array line of a plurality of conductive array lines coupled to a memory array.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: June 12, 2018
    Assignee: Unity Semiconductor Corporation
    Inventors: Christophe Chevallier, Chang Hua Siau
  • Publication number: 20180096726
    Abstract: Systems, integrated circuits, and methods to utilize access signals to facilitate memory operations in scaled arrays of memory elements are described. In at least some embodiments, a non-volatile memory device can include a cross-point array having resistive memory elements and line driver. The line driver can be configured to access a resistive memory element in the cross-point array.
    Type: Application
    Filed: September 15, 2017
    Publication date: April 5, 2018
    Inventors: Christophe Chevallier, Chang Hua Siau