Patents by Inventor Venkatesh Mohanakrishnaswamy

Venkatesh Mohanakrishnaswamy 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: 8853802
    Abstract: A method that includes forming a first layer having a first dopant concentration, the first layer having an integrated circuit region and a micro-electromechanical region and doping the micro-electromechanical region of the first layer to have a second dopant concentration is presented. The method includes forming a second layer having a third dopant concentration overlying the first layer, doping the second layer that overlies the micro-electromechanical region to have a fourth dopant concentration, forming a micro-electromechanical structure in the micro-electromechanical region using the first and second layers, and forming active components in the integrated circuit region using the second layer.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: October 7, 2014
    Assignees: STMicroelectronics, Inc., STMicroelectronics Asia Pacific PTE, Ltd.
    Inventors: Venkatesh Mohanakrishnaswamy, Olivier Le Neel, Loi N. Nguyen
  • Patent number: 8853850
    Abstract: A packaging scheme for MEMS device is provided. A method of packaging MEMS device in a semiconductor structure includes forming an insulation fence that surrounds the MEMS device on the semiconductor structure. The method further includes attaching a wafer of dielectric material to the insulation fence. The lid wafer, the insulation fence, and the semiconductor structure enclose the MEMS device.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: October 7, 2014
    Assignee: STMicroelectronics, Inc.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen, Venkata Ramana Yogi Mallela
  • Patent number: 8680631
    Abstract: A method that includes forming an opening between at least one first electrode and a second electrode by forming a recess in a first electrode layer, the recess having sidewalls that correspond to a surface of the at least one first electrode, forming a first sacrificial layer on the sidewalls of the recess, the first sacrificial layer having a first width that corresponds to a second width of the opening, forming a second electrode layer in the recess that corresponds to the second electrode, and removing the first sacrificial layer to form the opening between the second electrode and the at least one first electrode.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: March 25, 2014
    Assignee: STMicroelectronics, Inc.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen
  • Publication number: 20130228881
    Abstract: A method that includes forming an opening between at least one first electrode and a second electrode by forming a recess in a first electrode layer, the recess having sidewalls that correspond to a surface of the at least one first electrode, forming a first sacrificial layer on the sidewalls of the recess, the first sacrificial layer having a first width that corresponds to a second width of the opening, forming a second electrode layer in the recess that corresponds to the second electrode, and removing the first sacrificial layer to form the opening between the second electrode and the at least one first electrode.
    Type: Application
    Filed: April 12, 2013
    Publication date: September 5, 2013
    Applicant: STMicroelectronics, Inc.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen
  • Patent number: 8432006
    Abstract: A method that includes forming an opening between at least one first electrode and a second electrode by forming a recess in a first electrode layer, the recess having sidewalls that correspond to a surface of the at least one first electrode, forming a first sacrificial layer on the sidewalls of the recess, the first sacrificial layer having a first width that corresponds to a second width of the opening, forming a second electrode layer in the recess that corresponds to the second electrode, and removing the first sacrificial layer to form the opening between the second electrode and the at least one first electrode.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: April 30, 2013
    Assignee: STMicroelectronics, Inc.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen
  • Patent number: 8405202
    Abstract: A packaging scheme for MEMS device is provided. A method of packaging MEMS device in a semiconductor structure includes forming an insulation fence that surrounds the MEMS device on the semiconductor structure. The method further includes attaching a wafer of dielectric material to the insulation fence. The lid wafer, the insulation fence, and the semiconductor structure enclose the MEMS device.
    Type: Grant
    Filed: December 31, 2009
    Date of Patent: March 26, 2013
    Assignee: STMicroelectronics, Inc.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen, Venkata Ramana Yogi Mallela
  • Publication number: 20120235254
    Abstract: A method that includes forming a first layer having a first dopant concentration, the first layer having an integrated circuit region and a micro-electromechanical region and doping the micro-electromechanical region of the first layer to have a second dopant concentration is presented. The method includes forming a second layer having a third dopant concentration overlying the first layer, doping the second layer that overlies the micro-electromechanical region to have a fourth dopant concentration, forming a micro-electromechanical structure in the micro-electromechanical region using the first and second layers, and forming active components in the integrated circuit region using the second layer.
    Type: Application
    Filed: May 31, 2012
    Publication date: September 20, 2012
    Applicants: STMICROELECTRONICS ASIA PACIFIC PTE, LTD., STMICROELECTRONICS, INC.
    Inventors: Venkatesh Mohanakrishnaswamy, Olivier Le Neel, Loi N. Nguyen
  • Patent number: 8193595
    Abstract: A method that includes forming a first layer having a first dopant concentration, the first layer having an integrated circuit region and a micro-electromechanical region and doping the micro-electromechanical region of the first layer to have a second dopant concentration is presented. The method includes forming a second layer having a third dopant concentration overlying the first layer, doping the second layer that overlies the micro-electromechanical region to have a fourth dopant concentration, forming a micro-electromechanical structure in the micro-electromechanical region using the first and second layers, and forming active components in the integrated circuit region using the second layer.
    Type: Grant
    Filed: December 31, 2009
    Date of Patent: June 5, 2012
    Assignees: STMicroelectronics, Inc., STMicroelectronics Asia Pacific Pte Ltd.
    Inventors: Venkatesh Mohanakrishnaswamy, Olivier Le Neel, Loi N. Nguyen
  • Publication number: 20120056281
    Abstract: A method that includes forming an opening between at least one first electrode and a second electrode by forming a recess in a first electrode layer, the recess having sidewalls that correspond to a surface of the at least one first electrode, forming a first sacrificial layer on the sidewalls of the recess, the first sacrificial layer having a first width that corresponds to a second width of the opening, forming a second electrode layer in the recess that corresponds to the second electrode, and removing the first sacrificial layer to form the opening between the second electrode and the at least one first electrode.
    Type: Application
    Filed: August 29, 2011
    Publication date: March 8, 2012
    Applicant: STMICROELECTRONICS, INC.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen
  • Patent number: 8022491
    Abstract: A method that includes forming an opening between at least one first electrode and a second electrode by forming a recess in a first electrode layer, the recess having sidewalls that correspond to a surface of the at least one first electrode, forming a first sacrificial layer on the sidewalls of the recess, the first sacrificial layer having a first width that corresponds to a second width of the opening, forming a second electrode layer in the recess that corresponds to the second electrode, and removing the first sacrificial layer to form the opening between the second electrode and the at least one first electrode.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: September 20, 2011
    Assignee: STMicroelectronics, Inc.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen
  • Publication number: 20110156175
    Abstract: A method that includes forming a first layer having a first dopant concentration, the first layer having an integrated circuit region and a micro-electromechanical region and doping the micro-electromechanical region of the first layer to have a second dopant concentration is presented. The method includes forming a second layer having a third dopant concentration overlying the first layer, doping the second layer that overlies the micro-electromechanical region to have a fourth dopant concentration, forming a micro-electromechanical structure in the micro-electromechanical region using the first and second layers, and forming active components in the integrated circuit region using the second layer.
    Type: Application
    Filed: December 31, 2009
    Publication date: June 30, 2011
    Applicants: STMICROELECTRONICS, INC., STMICROELECTRONICS ASIA PACIFIC PTE LTD.
    Inventors: Venkatesh Mohanakrishnaswamy, Olivier Le Neel, Loi N. Nguyen
  • Patent number: 7943410
    Abstract: An embedded MEMS semiconductor substrate is set forth and can be a starting material for subsequent semiconductor device processing. A MEMS device is formed in a semiconductor substrate, including at least one MEMS electrode and a buried silicon dioxide sacrificial layer has been applied for releasing the MEMS. A planarizing layer is applied over the substrate, MEMS device and MEMS electrode. A polysilicon protection layer is applied over the planarizing layer. A silicon nitride capping layer is applied over the polysilicon protection layer. A polsilicon seed layer is applied over the polysilicon nitride capping layer. The MEMS device is released by removing at least a portion of the buried silicon dioxide sacrificial layer and an epitaxial layer is grown over the polysilicon seed layer to be used for subsequent semiconductor wafer processing.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: May 17, 2011
    Assignee: STMicroelectronics, Inc.
    Inventors: Olivier Le Neel, Peyman Sana, Loi Nguyen, Venkatesh Mohanakrishnaswamy
  • Publication number: 20110042801
    Abstract: A packaging scheme for MEMS device is provided. A method of packaging MEMS device in a semiconductor structure includes forming an insulation fence that surrounds the MEMS device on the semiconductor structure. The method further includes attaching a wafer of dielectric material to the insulation fence. The lid wafer, the insulation fence, and the semiconductor structure enclose the MEMS device.
    Type: Application
    Filed: December 31, 2009
    Publication date: February 24, 2011
    Applicant: STMICROELECTRONICS, INC.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen, Venkata Ramana Yogi Mallela
  • Publication number: 20100164024
    Abstract: A method that includes forming an opening between at least one first electrode and a second electrode by forming a recess in a first electrode layer, the recess having sidewalls that correspond to a surface of the at least one first electrode, forming a first sacrificial layer on the sidewalls of the recess, the first sacrificial layer having a first width that corresponds to a second width of the opening, forming a second electrode layer in the recess that corresponds to the second electrode, and removing the first sacrificial layer to form the opening between the second electrode and the at least one first electrode.
    Type: Application
    Filed: June 30, 2009
    Publication date: July 1, 2010
    Applicant: STMICROELECTRONICS, INC.
    Inventors: Venkatesh Mohanakrishnaswamy, Loi N. Nguyen
  • Publication number: 20100140724
    Abstract: An embedded MEMS semiconductor substrate is set forth and can be a starting material for subsequent semiconductor device processing. A MEMS device is formed in a semiconductor substrate, including at least one MEMS electrode and a buried silicon dioxide sacrificial layer has been applied for releasing the MEMS. A planarizing layer is applied over the substrate, MEMS device and MEMS electrode. A polysilicon protection layer is applied over the planarizing layer. A polysilicon nitride capping layer is applied over the polysilicon protection layer. A polysilicon seed layer is applied over the polysilicon nitride capping layer. The MEMS device is released by removing at least a portion of the buried silicon dioxide sacrificial layer and an epitaxial layer is grown over the polysilicon seed layer to be used for subsequent semiconductor wafer processing.
    Type: Application
    Filed: December 10, 2008
    Publication date: June 10, 2010
    Applicant: STMicroelectronics, Inc.
    Inventors: Olivier LE NEEL, Peyman Sana, Loi Nguyen, Venkatesh Mohanakrishnaswamy
  • Patent number: RE45286
    Abstract: An embedded MEMS semiconductor substrate is set forth and can be a starting material for subsequent semiconductor device processing. A MEMS device is formed in a semiconductor substrate, including at least one MEMS electrode and a buried silicon dioxide sacrificial layer has been applied for releasing the MEMS. A planarizing layer is applied over the substrate, MEMS device and MEMS electrode. A polysilicon protection layer is applied over the planarizing layer. A silicon nitride capping layer is applied over the polysilicon protection layer. A polsilicon seed layer is applied over the polysilicon nitride capping layer. The MEMS device is released by removing at least a portion of the buried silicon dioxide sacrificial layer and an epitaxial layer is grown over the polysilicon seed layer to be used for subsequent semiconductor wafer processing.
    Type: Grant
    Filed: May 9, 2013
    Date of Patent: December 9, 2014
    Assignee: STMicroelectronics, Inc.
    Inventors: Olivier Le Neel, Peyman Sana, Loi Nguyen, Venkatesh Mohanakrishnaswamy