Patents by Inventor Kundan Chand

Kundan Chand 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).

  • Method and system for calculating timing variations considering simultaneous switching noise
    Patent number: 9721047
    Abstract: A computer implemented method for determining a timing variation for an edge of a waveform under simultaneous switching noise (SSN) conditions is provided. The method includes characterizing an impact of mutual inductive relationships on a pin while the pin is at a quiet state and characterizing a signal edge applied to the pin. The signal edge can be characterized by the slew rate in one embodiment. A voltage change related to a curve characterizing the impact of mutual inductive relationships is identified and the voltage change is applied to a curve characterizing an impact of SSN on the signal edge. The method includes calculating a timing variation correlated to the voltage change applied to the curve characterizing the impact of SSN on the signal edge and presenting the calculated timing variation.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: August 1, 2017
    Assignee: Altera Corporation
    Inventors: Geping Liu, Kundan Chand, Zhe Li, Wui Hung Moo, Joseph Boon Hock Kho
  • Integrated Circuits With On-Die Decoupling Capacitors
    Publication number: 20140374877
    Abstract: An integrated circuit includes a decoupling capacitor and an internal circuit. The decoupling capacitor is coupled to a first external terminal of the integrated circuit. The internal circuit in the integrated circuit is coupled to a second external terminal of the integrated circuit. The decoupling capacitor is coupled to provide supply voltage current to the internal circuit through the first and the second external terminals and through external conductors. The external conductors are outside the integrated circuit.
    Type: Application
    Filed: June 21, 2013
    Publication date: December 25, 2014
    Applicant: Altera Corporation
    Inventors: Kyung Suk Oh, Bonnie Wang, Hong Shi, Hui Liu, Sergey Shumarayev, Sunitha Chandra, Weiqi Ding, Kundan Chand
  • Method and system for calculating timing variations considering simultaneous switching noise
    Patent number: 8825420
    Abstract: A computer implemented method for determining a timing variation for an edge of a waveform under simultaneous switching noise (SSN) conditions is provided. The method includes characterizing an impact of mutual inductive relationships on a pin while the pin is at a quiet state and characterizing a signal edge applied to the pin. The signal edge can be characterized by the slew rate in one embodiment. A voltage change related to a curve characterizing the impact of mutual inductive relationships is identified and the voltage change is applied to a curve characterizing an impact of SSN on the signal edge. The method includes calculating a timing variation correlated to the voltage change applied to the curve characterizing the impact of SSN on the signal edge and presenting the calculated timing variation.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: September 2, 2014
    Assignee: Altera Corporation
    Inventors: Geping Liu, Kundan Chand, Zhe Li, Wui Hung Moo, Joseph Boon Hock Kho