Patents by Inventor Thomas D. Bonifield

Thomas D. Bonifield 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: 11869933
    Abstract: Isolator structures for an integrated circuit with reduced effective parasitic capacitance. Disclosed embodiments include an isolator structure with parallel conductive elements forming a capacitor or inductive transformer, overlying a semiconductor structure including a well region of a first conductivity type formed within an tank region of a second conductivity type. The tank region is surrounded by doped regions and a buried doped layer of the first conductivity type, forming a plurality of diodes in series to the substrate. The junction capacitances of the series diodes have the effect of reducing the parasitic capacitance apparent at the isolator.
    Type: Grant
    Filed: August 10, 2021
    Date of Patent: January 9, 2024
    Assignee: Texas Instruments Incorporated
    Inventors: Raja Selvaraj, Anant Shankar Kamath, Byron Lovell Williams, Thomas D. Bonifield, John Kenneth Arch
  • Patent number: 11798979
    Abstract: An integrated capacitor on a semiconductor surface on a substrate includes a capacitor dielectric layer including at least one silicon compound material layer on a bottom plate. The capacitor dielectric layer includes a pitted sloped dielectric sidewall. Each of the pits is at least partially filled by one of a plurality of noncontiguous dielectric portions. A conformal dielectric layer may be formed over the noncontiguous dielectric portions. A top metal layer provides a top plate of the capacitor.
    Type: Grant
    Filed: January 25, 2021
    Date of Patent: October 24, 2023
    Assignee: Texas Instruments Incorporated
    Inventors: Elizabeth Costner Stewart, Jeffrey A. West, Thomas D. Bonifield, Joseph Andre Gallegos, Jay Sung Chun, Zhiyi Yu
  • Publication number: 20230129461
    Abstract: An integrated circuit includes a first isolation capacitor and a second isolation capacitor. The first isolation capacitor is electrically connected to a first circuit node and has first and second capacitor plates separated by a first dielectric stack. The second isolation capacitor is electrically connected in series between the first isolation capacitor and a second circuit node, and includes third and fourth capacitor plates separated by a second dielectric stack different from the first dielectric stack.
    Type: Application
    Filed: October 27, 2021
    Publication date: April 27, 2023
    Inventors: Honglin Guo, Thomas D. Bonifield
  • Patent number: 11495658
    Abstract: An electronic device, e.g. integrated circuit, has top and bottom metal plates located over a substrate, the bottom plate located between the top plate and the substrate. A high-stress silicon dioxide layer is located between the bottom plate and the substrate. At least one low-stress silicon dioxide layer is located between the top plate and the bottom plate.
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: November 8, 2022
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Elizabeth Costner Stewart, Jeffrey A. West, Thomas D. Bonifield
  • Patent number: 11205695
    Abstract: Methods of fabricating a thick oxide feature on a semiconductor wafer include forming a oxide layer having a thickness of at least six micrometers and depositing a photoresist layer on the oxide layer. The oxide layer has a first etch rate of X with a given etchant, the photoresist layer has a second etch rate of Y with the given etchant and the ratio of X:Y is less than 4:1. Prior to etching the photoresist layer and the oxide layer, the photoresist layer is patterned with a grayscale mask that creates a photoresist layer having a sidewall that forms an angle with the horizontal that is less than or equal to 10 degrees.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: December 21, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Elizabeth C. Stewart, Jeffrey Alan West, Thomas D. Bonifield, Jay Sung Chun, Byron Lovell Williams
  • Publication number: 20210367030
    Abstract: Isolator structures for an integrated circuit with reduced effective parasitic capacitance. Disclosed embodiments include an isolator structure with parallel conductive elements forming a capacitor or inductive transformer, overlying a semiconductor structure including a well region of a first conductivity type formed within an tank region of a second conductivity type. The tank region is surrounded by doped regions and a buried doped layer of the first conductivity type, forming a plurality of diodes in series to the substrate. The junction capacitances of the series diodes have the effect of reducing the parasitic capacitance apparent at the isolator.
    Type: Application
    Filed: August 10, 2021
    Publication date: November 25, 2021
    Inventors: Raja Selvaraj, Anant Shankar Kamath, Byron Lovell Williams, Thomas D. Bonifield, John Kenneth Arch
  • Patent number: 11107883
    Abstract: Isolator structures for an integrated circuit with reduced effective parasitic capacitance. Disclosed embodiments include an isolator structure with parallel conductive elements forming a capacitor or inductive transformer, overlying a semiconductor structure including a well region of a first conductivity type formed within an tank region of a second conductivity type. The tank region is surrounded by doped regions and a buried doped layer of the first conductivity type, forming a plurality of diodes in series to the substrate. The junction capacitances of the series diodes have the effect of reducing the parasitic capacitance apparent at the isolator.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: August 31, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Raja Selvaraj, Anant Shankar Kamath, Byron Lovell Williams, Thomas D. Bonifield, John Kenneth Arch
  • Patent number: 11087451
    Abstract: A method comprises obtaining a wafer comprising a plurality of components, wherein each of the plurality of components exposes a first surface of the component present in a first focal plane and a second surface of the component present in a second focal plane. The method comprises generating, by an optical tool, a first image of the first surface and a second image of the second surface of one of the plurality of components. The method comprises comparing, by a processor, the first image with a first reference image to produce a first value and the second image with a second reference image to produce a second value. The method comprises generating, by the processor, a wafer map indicating a quality state of the one of the plurality of components based on the first and second values.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: August 10, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Elizabeth C. Stewart, Young Sawk Oh, Zhiyi Yu, Jeffrey A. West, Thomas D. Bonifield
  • Patent number: 11069627
    Abstract: A semiconductor die includes a plurality of layers, the plurality of layers having a top surface. A scribe seal is located in the plurality of layers and includes a first metal stack having a first metal layer located proximate the top surface. A trench is located in at least one layer of the plurality of layers. The trench extends from the top surface of the plurality of layers and is located a distance from the first metal stack. An electrical insulating layer is located on the top surface. The electrical insulating layer covers at least a portion of the top surface adjacent the first metal layer and extends a distance from the top surface of the first metal layer.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: July 20, 2021
    Assignee: Texas Instruments Incorporated
    Inventors: Thomas D. Bonifield, Jeffrey A. West, Byron Williams, Honglin Guo
  • Patent number: 10978548
    Abstract: A method of forming an integrated capacitor on a semiconductor surface on a substrate includes etching a capacitor dielectric layer including at least one silicon compound material layer on a bottom plate which is above and electrically isolated from the semiconductor surface to provide at least one defined dielectric feature having sloped dielectric sidewall portion. A dielectric layer is deposited to at least partially fill pits in the sloped dielectric sidewall portion to smooth a surface of the sloped dielectric sidewall portion. The dielectric layer is etched, and a top plate is then formed on top of the dielectric feature.
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: April 13, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Elizabeth Costner Stewart, Jeffrey A. West, Thomas D. Bonifield, Joseph Andre Gallegos, Jay Sung Chun, Zhiyi Yu
  • Patent number: 10886120
    Abstract: An integrated circuit a semiconductor substrate includes a device die with includes transistors configured to execute an electrical function. A first interconnect layer of the device die is configured to route electrical signals or power to terminals of the transistors. An interlevel dielectric (ILD) layer is located over the interconnect layer. A metal electrode located over the ILD layer. A dielectric barrier layer is located between the ILD layer and the metal electrode. A scribe seal surrounds the device die. A first opening within the dielectric barrier layer surrounds the metal electrode. Second and third openings within the dielectric barrier layer are located between the first opening and the scribe seal.
    Type: Grant
    Filed: August 16, 2019
    Date of Patent: January 5, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jeffrey Alan West, Adrian Salinas, Elizabeth C. Stewart, Dhanoop Varghese, Thomas D. Bonifield
  • Patent number: 10847605
    Abstract: High voltage integrated circuit capacitors are disclosed. In an example arrangement, A capacitor structure includes a semiconductor substrate; a bottom plate having a conductive layer overlying the semiconductor substrate; a capacitor dielectric layer deposited overlying at least a portion of the bottom plate and having a first thickness greater than about 6 um in a first region; a sloped transition region in the capacitor dielectric at an edge of the first region, the sloped transition region having an upper surface with a slope of greater than 5 degrees from a horizontal plane and extending from the first region to a second region of the capacitor dielectric layer having a second thickness lower than the first thickness; and a top plate conductor formed overlying at least a portion of the capacitor dielectric layer in the first region. Methods and additional apparatus arrangements are disclosed.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: November 24, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jeffrey Alan West, Thomas D. Bonifield, Byron Lovell Williams
  • Patent number: 10707297
    Abstract: A microelectronic device contains a high voltage component having a high voltage node and a low voltage node. The high voltage node is isolated from the low voltage node by a main dielectric between the high voltage node and low voltage elements at a surface of the substrate of the microelectronic device. A lower-bandgap dielectric layer is disposed between the high voltage node and the main dielectric. The lower-bandgap dielectric layer contains at least one sub-layer with a bandgap energy less than a bandgap energy of the main dielectric. The lower-bandgap dielectric layer extends beyond the high voltage node continuously around the high voltage node. The lower-bandgap dielectric layer has an isolation break surrounding the high voltage node at a distance of at least twice the thickness of the lower-bandgap dielectric layer from the high voltage node.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: July 7, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jeffrey Alan West, Thomas D. Bonifield, Byron Lovell Williams
  • Publication number: 20200058485
    Abstract: An integrated circuit a semiconductor substrate includes a device die with includes transistors configured to execute an electrical function. A first interconnect layer of the device die is configured to route electrical signals or power to terminals of the transistors. An interlevel dielectric (ILD) layer is located over the interconnect layer. A metal electrode located over the ILD layer. A dielectric barrier layer is located between the ILD layer and the metal electrode. A scribe seal surrounds the device die. A first opening within the dielectric barrier layer surrounds the metal electrode. Second and third openings within the dielectric barrier layer are located between the first opening and the scribe seal.
    Type: Application
    Filed: August 16, 2019
    Publication date: February 20, 2020
    Inventors: Jeffrey Alan West, Adrian Salinas, Elizabeth C. Stewart, Dhanoop Varghese, Thomas D. Bonifield
  • Publication number: 20190378892
    Abstract: An electronic device, e.g. integrated circuit, has top and bottom metal plates located over a substrate, the bottom plate located between the top plate and the substrate. A high-stress silicon dioxide layer is located between the bottom plate and the substrate. At least one low-stress silicon dioxide layer is located between the top plate and the bottom plate.
    Type: Application
    Filed: June 7, 2019
    Publication date: December 12, 2019
    Inventors: Elizabeth Costner Stewart, Jeffrey A. West, Thomas D. Bonifield
  • Publication number: 20190198604
    Abstract: Methods of fabricating a thick oxide feature on a semiconductor wafer include forming a oxide layer having a thickness of at least six micrometers and depositing a photoresist layer on the oxide layer. The oxide layer has a first etch rate of X with a given etchant, the photoresist layer has a second etch rate of Y with the given etchant and the ratio of X:Y is less than 4:1. Prior to etching the photoresist layer and the oxide layer, the photoresist layer is patterned with a grayscale mask that creates a photoresist layer having a sidewall that forms an angle with the horizontal that is less than or equal to 10 degrees.
    Type: Application
    Filed: December 21, 2017
    Publication date: June 27, 2019
    Inventors: Elizabeth C. Stewart, Jeffrey Alan West, Thomas D. Bonifield, Jay Sung Chun, Byron Lovell Williams
  • Publication number: 20190188839
    Abstract: A method comprises obtaining a wafer comprising a plurality of components, wherein each of the plurality of components exposes a first surface of the component present in a first focal plane and a second surface of the component present in a second focal plane. The method comprises generating, by an optical tool, a first image of the first surface and a second image of the second surface of one of the plurality of components. The method comprises comparing, by a processor, the first image with a first reference image to produce a first value and the second image with a second reference image to produce a second value. The method comprises generating, by the processor, a wafer map indicating a quality state of the one of the plurality of components based on the first and second values.
    Type: Application
    Filed: December 19, 2017
    Publication date: June 20, 2019
    Inventors: Elizabeth C. STEWART, Young Sawk OH, Zhiyi YU, Jeffrey A. WEST, Thomas D. BONIFIELD
  • Publication number: 20190148486
    Abstract: Isolator structures for an integrated circuit with reduced effective parasitic capacitance. Disclosed embodiments include an isolator structure with parallel conductive elements forming a capacitor or inductive transformer, overlying a semiconductor structure including a well region of a first conductivity type formed within an tank region of a second conductivity type. The tank region is surrounded by doped regions and a buried doped layer of the first conductivity type, forming a plurality of diodes in series to the substrate. The junction capacitances of the series diodes have the effect of reducing the parasitic capacitance apparent at the isolator.
    Type: Application
    Filed: December 21, 2018
    Publication date: May 16, 2019
    Inventors: Raja Selvaraj, Anant Shankar Kamath, Byron Lovell Williams, Thomas D. Bonifield, John Kenneth Arch
  • Publication number: 20190074350
    Abstract: A microelectronic device contains a high voltage component having a high voltage node and a low voltage node. The high voltage node is isolated from the low voltage node by a main dielectric between the high voltage node and low voltage elements at a surface of the substrate of the microelectronic device. A lower-bandgap dielectric layer is disposed between the high voltage node and the main dielectric. The lower-bandgap dielectric layer contains at least one sub-layer with a bandgap energy less than a bandgap energy of the main dielectric. The lower-bandgap dielectric layer extends beyond the high voltage node continuously around the high voltage node. The lower-bandgap dielectric layer has an isolation break surrounding the high voltage node at a distance of at least twice the thickness of the lower-bandgap dielectric layer from the high voltage node.
    Type: Application
    Filed: November 1, 2018
    Publication date: March 7, 2019
    Inventors: Jeffrey Alan West, Thomas D. Bonifield, Byron Lovell Williams
  • Patent number: 10186576
    Abstract: Isolator structures for an integrated circuit with reduced effective parasitic capacitance. Disclosed embodiments include methods of forming an integrated circuit including an isolator structure. The isolator structure includes parallel conductive elements forming a capacitor or inductive transformer, overlying a semiconductor structure including a well region of a first conductivity type formed within an tank region of a second conductivity type. The tank region is surrounded by doped regions and a buried doped layer of the first conductivity type, forming a plurality of diodes in series to the substrate.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: January 22, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Raja Selvaraj, Anant Shankar Kamath, Byron Lovell Williams, Thomas D. Bonifield, John Kenneth Arch