Patents by Inventor Nagarajan Ranganathan

Nagarajan Ranganathan 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: 11963452
    Abstract: A method of forming a piezoelectric microphone with an interlock/stopper and a micro-bump and a resulting device are provided. Embodiments include forming a membrane over a Si substrate having a first and second sacrificial layer disposed on opposite surfaces thereof, the membrane being formed on the first sacrificial layer, forming a first HM over the membrane, forming first and second vias through the first HM, forming a first pad layer in the first and second vias and over an exposed top thin film, forming a trench to the first sacrificial layer between the first and second vias and a gap between the trench and second via, patterning a second HM over the membrane, in the first and second vias, the trench and the gap, and forming a second pad layer over the second HM and in exposed areas around the first and second vias to form pad structures.
    Type: Grant
    Filed: November 24, 2020
    Date of Patent: April 16, 2024
    Assignee: VANGUARD INTERNATIONAL SEMICONDUCTOR SINGAPORE PTE. LTD.
    Inventors: Jia Jie Xia, Rakesh Kumar, Minu Prabhachandran Nair, Nagarajan Ranganathan
  • Patent number: 11269990
    Abstract: A runtime attack can be detected on a big data system while processes are executed on various nodes. A behavior profile can be maintained for tasks or processes running on different nodes. The existence of a call variance in one of the traces for one of the behavior profiles can be determined. A memory variance can also be detected in one of the behavior profiles. A runtime attack has occurred when both the memory variance and the call variance are determined to exist.
    Type: Grant
    Filed: April 30, 2020
    Date of Patent: March 8, 2022
    Assignee: UNIVERSITY OF SOUTH FLORIDA
    Inventors: Santosh K. Aditham, Nagarajan Ranganathan
  • Publication number: 20210083169
    Abstract: A method of forming a piezoelectric microphone with an interlock/stopper and a micro-bump and a resulting device are provided. Embodiments include forming a membrane over a Si substrate having a first and second sacrificial layer disposed on opposite surfaces thereof, the membrane being formed on the first sacrificial layer, forming a first HM over the membrane, forming first and second vias through the first HM, forming a first pad layer in the first and second vias and over an exposed top thin film, forming a trench to the first sacrificial layer between the first and second vias and a gap between the trench and second via, patterning a second HM over the membrane, in the first and second vias, the trench and the gap, and forming a second pad layer over the second HM and in exposed areas around the first and second vias to form pad structures.
    Type: Application
    Filed: November 24, 2020
    Publication date: March 18, 2021
    Inventors: Jia Jie Xia, RAKESH KUMAR, Minu Prabhachandran NAIR, Nagarajan RANGANATHAN
  • Patent number: 10886455
    Abstract: A method of forming a piezoelectric microphone with an interlock/stopper and a micro-bump and a resulting device are provided. Embodiments include forming a membrane over a Si substrate having a first and second sacrificial layer disposed on opposite surfaces thereof, the membrane being formed on the first sacrificial layer, forming a first HM over the membrane, forming first and second vias through the first HM, forming a first pad layer in the first and second vias and over an exposed top thin film, forming a trench to the first sacrificial layer between the first and second vias and a gap between the trench and second via, patterning a second HM over the membrane, in the first and second vias, the trench and the gap, and forming a second pad layer over the second HM and in exposed areas around the first and second vias to form pad structures.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: January 5, 2021
    Assignee: VANGUARD INTERNATIONAL SEMICONDUCTOR SINGAPORE PTE. LTD.
    Inventors: Jia Jie Xia, Rakesh Kumar, Minu Prabhachandran Nair, Nagarajan Ranganathan
  • Patent number: 10805316
    Abstract: Various examples of methods and systems are provided for an attack detection system that can detect attacks in big data systems. The attack detection system can include security modules coupled to data nodes of the big data system. The attack detection system can identify a process executing on the respective data node. A process signature can be generated for the process executing on the data node. A determination of whether a big data system is being attacked can be based at least in part on a comparison of the process signature with at least one other process signature for the same process executing on another security module. The other process signatures are received via secure communication from the other security module.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: October 13, 2020
    Assignee: UNIVERSITY OF SOUTH FLORIDA
    Inventors: Santosh Kumar Aditham, Nagarajan Ranganathan
  • Patent number: 10678907
    Abstract: A runtime attack can be detected on a big data system while processes are executed on various computing devices. A behavior profile can be maintained for tasks or processes running on different computing devices. The existence of a call variance in one of the traces for one of the behavior profiles can be determined. A memory variance can also be detected in one of the behavior profiles. A runtime attack has occurred when both the memory variance and the call variance are determined to exist.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: June 9, 2020
    Assignee: University of South Florida
    Inventors: Santosh K. Aditham, Nagarajan Ranganathan
  • Patent number: 10358340
    Abstract: Integrated circuits having shielded micro-electromechanical system (MEMS) devices and method for fabricating shielded MEMS devices are provided. In an example, an integrated circuit having a shielded MEMS device includes a substrate, a ground plane including conductive material over the substrate, and a dielectric layer over the ground plane. The integrated circuit further includes a MEMS device over the ground plane. Also, the integrated circuit includes a conductive pillar through the dielectric layer and in contact with the ground plane. The integrated circuit includes a metallic thin film over the MEMS device and in contact with the conductive pillar, wherein the metallic thin film, the conductive pillar and the ground plane form an electromagnetic shielding structure surrounding the MEMS device. Further, the integrated circuit includes an acoustic shielding structure over the substrate and adjacent the electromagnetic shielding structure.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: July 23, 2019
    Assignee: Globalfoundries Singapore Pte. Ltd.
    Inventors: Humberto Campanella-Pineda, Rakesh Kumar, Zouhair Sbiaa, Nagarajan Ranganathan, Ramachandramurthy Pradeep Yelehanka
  • Publication number: 20190089720
    Abstract: Various examples of methods and systems are provided for an attack detection system that can detect attacks in big data systems. The attack detection system can include security modules coupled to data nodes of the big data system. The attack detection system can identify a process executing on the respective data node. A process signature can be generated for the process executing on the data node. A determination of whether a big data system is being attacked can be based at least in part on a comparison of the process signature with at least one other process signature for the same process executing on another security module. The other process signatures are received via secure communication from the other security module.
    Type: Application
    Filed: May 22, 2017
    Publication date: March 21, 2019
    Applicant: University of South Florida
    Inventors: SANTOSH KUMAR ADITHAM, NAGARAJAN RANGANATHAN
  • Publication number: 20190036003
    Abstract: A method of forming a piezoelectric microphone with an interlock/stopper and a micro-bump and a resulting device are provided. Embodiments include forming a membrane over a Si substrate having a first and second sacrificial layer disposed on opposite surfaces thereof, the membrane being formed on the first sacrificial layer, forming a first HM over the membrane, forming first and second vias through the first HM, forming a first pad layer in the first and second vias and over an exposed top thin film, forming a trench to the first sacrificial layer between the first and second vias and a gap between the trench and second via, patterning a second HM over the membrane, in the first and second vias, the trench and the gap, and forming a second pad layer over the second HM and in exposed areas around the first and second vias to form pad structures.
    Type: Application
    Filed: July 31, 2017
    Publication date: January 31, 2019
    Inventors: Jia Jie XIA, Rakesh KUMAR, Minu Prabhachandran NAIR, Nagarajan RANGANATHAN
  • Publication number: 20180211033
    Abstract: A runtime attack can be detected on a big data system while processes are executed on various computing devices. A behavior profile can be maintained for tasks or processes running on different computing devices. The existence of a call variance in one of the traces for one of the behavior profiles can be determined. A memory variance can also be detected in one of the behavior profiles. A runtime attack has occurred when both the memory variance and the call variance are determined to exist.
    Type: Application
    Filed: January 26, 2018
    Publication date: July 26, 2018
    Applicant: University of South Florida
    Inventors: Santosh K. Aditham, Nagarajan Ranganathan
  • Publication number: 20170313577
    Abstract: Integrated circuits having shielded micro-electromechanical system (MEMS) devices and method for fabricating shielded MEMS devices are provided. In an example, an integrated circuit having a shielded MEMS device includes a substrate, a ground plane including conductive material over the substrate, and a dielectric layer over the ground plane. The integrated circuit further includes a MEMS device over the ground plane. Also, the integrated circuit includes a conductive pillar through the dielectric layer and in contact with the ground plane. The integrated circuit includes a metallic thin film over the MEMS device and in contact with the conductive pillar, wherein the metallic thin film, the conductive pillar and the ground plane form an electromagnetic shielding structure surrounding the MEMS device. Further, the integrated circuit includes an acoustic shielding structure over the substrate and adjacent the electromagnetic shielding structure.
    Type: Application
    Filed: April 28, 2016
    Publication date: November 2, 2017
    Inventors: Humberto Campanella Pineda, Rakesh Kumar, Zouhair Sbiaa, Nagarajan Ranganathan, Ramachandramurthy Pradeep Yelehanka
  • Publication number: 20170121172
    Abstract: Integrated MEMS-CMOS devices and integrated circuits with MEMS devices and CMOS devices are provided. An exemplary integrated MEMS-CMOS device is vertically integrated and includes a substrate having a first side and a second side opposite the first side. Further, the exemplary vertically integrated MEMS-CMOS device includes a CMOS device located in and/or over the first side of the substrate. Also, the exemplary vertically integrated MEMS-CMOS device includes a MEMS device located in and/or under the second side of the substrate.
    Type: Application
    Filed: January 13, 2017
    Publication date: May 4, 2017
    Inventors: Jia Jie Xia, Nagarajan Ranganathan, Rakesh Kumar, Aveek Nath Chatterjee
  • Patent number: 9550668
    Abstract: Integrated MEMS devices for pressure sensing and inertial sensing, methods for fabricating such integrated devices, and methods for fabricating vertically integrated MEMS pressure sensor/inertial sensor devices are provided. In an example, a method for fabricating an integrated device for pressure and inertial sensing includes forming a MEMS pressure sensor on a first side of a semiconductor substrate. The method further includes forming a MEMS inertial sensor on a second side of the semiconductor substrate. The second side of the semiconductor substrate is opposite the first side of the semiconductor substrate.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: January 24, 2017
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Jia Jie Xia, Nagarajan Ranganathan, Rakesh Kumar, Aveek Nath Chatterjee
  • Patent number: 9546090
    Abstract: Integrated MEMS-CMOS devices and methods for fabricating MEMS devices and CMOS devices are provided. An exemplary method for fabricating a MEMS device and a CMOS device includes forming the CMOS device in and/or over a first side of a semiconductor substrate. Further, the method includes forming the MEMS device in and/or under a second side of the semiconductor substrate. The second side of the semiconductor substrate is opposite the first side of the semiconductor substrate.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: January 17, 2017
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Jia Jie Xia, Nagarajan Ranganathan, Rakesh Kumar, Aveek Nath Chatterjee
  • Patent number: 9531384
    Abstract: An adiabatic dynamic differential logic circuit is provided for mitigating a differential power analysis (DPA) attack on a secure integrated chip including a plurality of transistors configured to perform each of a plurality of two-input logical output calculations, wherein each of the two-input logical output calculations results in a minimal differential power of the logic circuit. In one embodiment, a high-performance adiabatic dynamic differential logic circuit is provided which is optimized for very high operating frequencies. In another embodiment, a body-biased adiabatic dynamic differential logic circuit is provided which utilizes transistor body biasing to improve the switching time and differential power of the design.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: December 27, 2016
    Assignee: University of South Florida
    Inventors: Matthew Morrison, Jarred Adam Ligatti, Nagarajan Ranganathan
  • Patent number: 8729695
    Abstract: In an embodiment, a wafer level package may be provided. The wafer level package may include a device wafer including a MEMS device, a cap wafer disposed over the device wafer, at least one first interconnect disposed between the device wafer and the cap wafer and configured to provide an electrical connection between the device wafer and the cap wafer, and a conformal sealing ring disposed between the device wafer and the cap wafer and configured to surround the at least one first interconnect and the MEMS device so as to provide a conformally sealed environment for the at least one first interconnect and the MEMS device, wherein the conformal sealing ring may be configured to conform to a respective suitable surface of the device wafer and the cap wafer when the device wafer may be bonded to the cap wafer. A method of forming a wafer level package may also be provided.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: May 20, 2014
    Assignees: Agency for Science, Technology and Research, Seiko Instruments, Inc.
    Inventors: Chirayarikathu Veedu Sankarapillai Premachandran, Rakesh Kumar, Nagarajan Ranganathan, Won Kyoung Choi, Ebin Liao, Yasuyuki Mitsuoka, Hiroshi Takahashi, Ryuta Mitsusue
  • Patent number: 8603917
    Abstract: According to embodiments of the present invention, a method of processing a wafer is provided. The wafer includes a plurality of through-wafer interconnects extending from a frontside surface of the wafer to a backside surface of the wafer. The method includes removing a part of wafer material of the back-side such that a portion of the wafer material between the through-wafer interconnects is removed, thereby exposing a portion of the through-wafer interconnects, forming a layer of low-k dielectric material between the through-wafer interconnects, and planarizing the layer of low-k dielectric material such that a surface of the portion of the through-wafer interconnect is exposed.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: December 10, 2013
    Assignee: Agency for Science, Technology and Research
    Inventors: Woon Seong Kwon, Nagarajan Ranganathan
  • Publication number: 20130020713
    Abstract: In an embodiment, a wafer level package may be provided. The wafer level package may include a device wafer including a MEMS device, a cap wafer disposed over the device wafer, at least one first interconnect disposed between the device wafer and the cap wafer and configured to provide an electrical connection between the device wafer and the cap wafer, and a conformal sealing ring disposed between the device wafer and the cap wafer and configured to surround the at least one first interconnect and the MEMS device so as to provide a conformally sealed environment for the at least one first interconnect and the MEMS device, wherein the conformal sealing ring may be configured to conform to a respective suitable surface of the device wafer and the cap wafer when the device wafer may be bonded to the cap wafer. A method of forming a wafer level package may also be provided.
    Type: Application
    Filed: September 25, 2009
    Publication date: January 24, 2013
    Inventors: Chirayarikathu Veedu Sankarapillai Premachandran, Rakesh Kumar, Nagarajan Ranganathan, Won Kyoung Choi, Ebin Liao, Yasuyuki Mitsuoka, Hiroshi Takahashi, Ryuta Mitsusue
  • Publication number: 20120178258
    Abstract: According to embodiments of the present invention, a method of processing a wafer is provided. The wafer includes a plurality of through-wafer interconnects extending from a frontside surface of the wafer to a backside surface of the wafer. The method includes removing a part of wafer material of the back-side such that a portion of the wafer material between the through-wafer interconnects is removed, thereby exposing a portion of the through-wafer interconnects, forming a layer of low-k dielectric material between the through-wafer interconnects, and planarizing the layer of low-k dielectric material such that a surface of the portion of the through-wafer interconnect is exposed.
    Type: Application
    Filed: October 28, 2011
    Publication date: July 12, 2012
    Inventors: Woon Seong Kwon, Nagarajan Ranganathan
  • Patent number: 7944230
    Abstract: The present invention includes a circuit-level system and method for preventing the propagation of soft errors in logic cells. A radiation jammer circuit in accordance with the present invention, including an RC differentiator and a depletion mode MOS circuit, when inserted at the output of a logic cell, significantly reduces the propagation of transient glitches. The radiation jammer circuit is a novel transistor-level optimization technique, which has been used to reduce soft errors in a logic circuit. A method to insert radiation jammer cells on selective nodes in a logic circuit for low overheads in terms of delay, power, and area is also introduced.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: May 17, 2011
    Assignee: University of South Florida
    Inventors: Nagarajan Ranganathan, Koustav Bhattacharya