Patents by Inventor Sankar Ramachandran

Sankar Ramachandran 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: 11709983
    Abstract: Analysis of power supply noise in simulations of a design of a circuit can use per instance dynamic voltage drops (DVD) in timing analyses so that the simulated DVD values on a per victim cell basis can accurately guide the timing analysis on each victim instead of a global DVD for all victims during the timing analysis. In one embodiment, a method can: determine, during a power analysis simulation, a representation of an energy lost, during each switching window at each output of each victim cell, at one or more power supply rails of each of the victim cells in the set of victim cells due to aggressors in the design; and provide the representation of the energy lost separately for each victim cell to a timing analysis system. The representation can be a rectangle having a width defined by a switching window of a victim's output.
    Type: Grant
    Filed: May 10, 2021
    Date of Patent: July 25, 2023
    Assignee: ANSYS, INC.
    Inventors: Qian Shen, Sankar Ramachandran, Joao Geada, Scott Johnson, Anusha Gummana
  • Patent number: 11592466
    Abstract: A probe card device and a self-aligned probe are provided. The self-aligned probe includes a fixing end portion configured to be abutted against a space transformer, a testing end portion configured to detachably abut against a device under test (DUT), a first connection portion connected to the fixing end portion, a second connection portion connected to the testing end portion, and an arced portion that connects the first connection portion and the second connection portion. The fixing end portion and the testing end portion jointly define a reference line passing there-through. The first connection portion has an aligned protrusion, and a maximum distance between the arced portion and the reference line is greater than 75 ?m and is less than 150 ?m.
    Type: Grant
    Filed: October 1, 2021
    Date of Patent: February 28, 2023
    Assignee: CHUNGHWA PRECISION TEST TECH. CO., LTD.
    Inventors: Kai-Chieh Hsieh, Wei-Jhih Su, Hong-Ming Chen, Vel Sankar Ramachandran
  • Patent number: 11536744
    Abstract: A probe card device and a dual-arm probe are provided. The dual-arm probe has a probe length, and includes a bifurcation end portion and a testing end portion. The dual-arm probe has two broad side surfaces respectively arranged on two opposite sides thereof. The dual-arm probe has a separation slot that is recessed from a bifurcation opening of the bifurcation end portion toward the testing end portion and that penetrates from one of the two broad side surfaces to the other one, so that two branch arms of the dual-arm probe are defined by the separation slot and are spaced apart from each other. The separation slot has a slot length being 50% to 90% of the probe length. In a cross section of the two branch arms, an area of any one of the two branch arms is 90% to 110% of that of the other one.
    Type: Grant
    Filed: October 1, 2021
    Date of Patent: December 27, 2022
    Assignee: CHUNGHWA PRECISION TEST TECH. CO., LTD.
    Inventors: Kai-Chieh Hsieh, Wei-Jhih Su, Hong-Ming Chen, Vel Sankar Ramachandran
  • Patent number: 11506685
    Abstract: A probe card device and a disposable adjustment film thereof are provided. The disposable adjustment film is integrally formed as a single one-piece structure, and includes a probe hole and a plurality of first slots that are parallel to each other. The disposable adjustment film defines two predetermined lines respectively extending from two opposite lateral edges thereof to the probe hole. The two predetermined lines respectively extend across the first slots. In a plane that the disposable adjustment film is located thereon, when the disposable adjustment film is applied with forces that act in opposite directions and that are parallel to any one of the first slots, the disposable adjustment film is broken into two abandoned films along the two predetermined lines.
    Type: Grant
    Filed: October 1, 2021
    Date of Patent: November 22, 2022
    Assignee: CHUNGHWA PRECISION TEST TECH. CO., LTD.
    Inventors: Kai-Chieh Hsieh, Wei-Jhih Su, Chao-Hui Tseng, Hsien-Yu Wang, Vel Sankar Ramachandran
  • Publication number: 20220365110
    Abstract: A probe card device and a disposable adjustment film thereof are provided. The disposable adjustment film is integrally formed as a single one-piece structure, and includes a probe hole and a plurality of first slots that are parallel to each other. The disposable adjustment film defines two predetermined lines respectively extending from two opposite lateral edges thereof to the probe hole. The two predetermined lines respectively extend across the first slots. In a plane that the disposable adjustment film is located thereon, when the disposable adjustment film is applied with forces that act in opposite directions and that are parallel to any one of the first slots, the disposable adjustment film is broken into two abandoned films along the two predetermined lines.
    Type: Application
    Filed: October 1, 2021
    Publication date: November 17, 2022
    Inventors: KAI-CHIEH HSIEH, WEI-JHIH SU, CHAO-HUI TSENG, HSIEN-YU WANG, VEL SANKAR RAMACHANDRAN
  • Publication number: 20220334145
    Abstract: A probe card device and a spring-like probe are provided. The spring-like probe defines a longitudinal direction and a separation plane that is parallel to the longitudinal direction, and includes a fixing end portion, a testing end portion, and two stroke arms that are arranged between the fixing end portion and the testing end portion. The two stroke arms are spaced apart from each other and are respectively located at two opposite sides of the separation plane. Each of the two stroke arms is in a curved shape. Two projection regions defined by orthogonally projecting the two stroke arms onto the separation plane have at least one intersection point. In a cross section of the two stroke arms perpendicular to the longitudinal direction, an area of any one of the two stroke arms is 95% to 105% of an area of another one of the two stroke arms.
    Type: Application
    Filed: October 1, 2021
    Publication date: October 20, 2022
    Inventors: KAI-CHIEH HSIEH, WEI-JHIH SU, Hong-Ming Chen, VEL SANKAR RAMACHANDRAN
  • Patent number: 11460486
    Abstract: A probe card device and a spring-like probe are provided. The spring-like probe defines a longitudinal direction and a separation plane that is parallel to the longitudinal direction, and includes a fixing end portion, a testing end portion, and two stroke arms that are arranged between the fixing end portion and the testing end portion. The two stroke arms are spaced apart from each other and are respectively located at two opposite sides of the separation plane. Each of the two stroke arms is in a curved shape. Two projection regions defined by orthogonally projecting the two stroke arms onto the separation plane have at least one intersection point. In a cross section of the two stroke arms perpendicular to the longitudinal direction, an area of any one of the two stroke arms is 95% to 105% of an area of another one of the two stroke arms.
    Type: Grant
    Filed: October 1, 2021
    Date of Patent: October 4, 2022
    Assignee: CHUNGHWA PRECISION TEST TECH. CO., LTD.
    Inventors: Kai-Chieh Hsieh, Wei-Jhih Su, Hong-Ming Chen, Vel Sankar Ramachandran
  • Publication number: 20220170960
    Abstract: A probe card device and a dual-arm probe are provided. The dual-arm probe has a probe length, and includes a bifurcation end portion and a testing end portion. The dual-arm probe has two broad side surfaces respectively arranged on two opposite sides thereof The dual-arm probe has a separation slot that is recessed from a bifurcation opening of the bifurcation end portion toward the testing end portion and that penetrates from one of the two broad side surfaces to the other one, so that two branch arms of the dual-arm probe are defined by the separation slot and are spaced apart from each other. The separation slot has a slot length being 50% to 90% of the probe length. In a cross section of the two branch arms, an area of any one of the two branch arms is 90% to 110% of that of the other one.
    Type: Application
    Filed: October 1, 2021
    Publication date: June 2, 2022
    Inventors: KAI-CHIEH HSIEH, WEI-JHIH SU, Hong-Ming Chen, VEL SANKAR RAMACHANDRAN
  • Publication number: 20220163565
    Abstract: A probe card device and a self-aligned probe are provided. The self-aligned probe includes a fixing end portion configured to be abutted against a space transformer, a testing end portion configured to detachably abut against a device under test (DUT), a first connection portion connected to the fixing end portion, a second connection portion connected to the testing end portion, and an arced portion that connects the first connection portion and the second connection portion. The fixing end portion and the testing end portion jointly define a reference line passing there-through. The first connection portion has an aligned protrusion, and a maximum distance between the arced portion and the reference line is greater than 75 ?m and is less than 150 ?m.
    Type: Application
    Filed: October 1, 2021
    Publication date: May 26, 2022
    Inventors: KAI-CHIEH HSIEH, WEI-JHIH SU, Hong-Ming Chen, VEL SANKAR RAMACHANDRAN
  • Patent number: 11210444
    Abstract: Example systems and methods are disclosed for performing a timing analysis on a circuit design. A plurality of switching scenarios are identified for the circuit design. One or more predictive models are applied to predict a subset of the plurality of switching scenarios that are likely to cause timing paths with critical timing problems. A dynamic voltage analysis is performed on timing paths based on the subset of switching scenarios. The one or more predictive models are applied to predict a set of critical timing paths based on the subset of switching scenarios that are likely to cause critical timing problems, the one or more predictive models taking into account the dynamic voltage analysis. A timing analysis is the performed on the set of critical timing paths.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: December 28, 2021
    Assignee: Ansys, Inc.
    Inventors: Norman Chang, Hao Zhuang, Ganesh Tsavatapalli, Joao Geada, Sankar Ramachandran, Rahul Rajan, Ying-Shiun Li, Yaowei Jia, Mathew Joseph Kaipanatu, Suresh Kumar Mantena
  • Patent number: 10609491
    Abstract: A speaker includes a diaphragm and a MEMS actuator. The MEMS actuator includes a coupling member attached to the diaphragm and at least one closed cantilever ring that is surrounded around and connected to the coupling member by plural first bridge members, wherein the closed cantilever ring is configured to be electrically-biased to cause an axial movement of the coupling member and the diaphragm.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: March 31, 2020
    Assignee: MERRY ELECTRONICS (SHENZHEN) CO., LTD.
    Inventors: Kai-Yu Jiang, Jen-Yi Chen, Vel Sankar Ramachandran
  • Publication number: 20200092655
    Abstract: A speaker includes a diaphragm and a MEMS actuator. The MEMS actuator includes a coupling member attached to the diaphragm and at least one closed cantilever ring that is surrounded around and connected to the coupling member by plural first bridge members, wherein the closed cantilever ring is configured to be electrically-biased to cause an axial movement of the coupling member and the diaphragm.
    Type: Application
    Filed: March 11, 2019
    Publication date: March 19, 2020
    Inventors: Kai-Yu JIANG, Jen-Yi CHEN, Vel Sankar RAMACHANDRAN