Patents by Inventor Chaitanya Chava

Chaitanya Chava 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).

  • Switched-current oscillator for clock-frequency spreading
    Patent number: 7504897
    Abstract: A switched-current oscillator having a dc current source adapted to charge a capacitor so that the capacitor charging time is controlled based on a sequence of (pseudo)randomly selected values, each of those values defining a corresponding charging time. A discharge device is adapted to discharge the capacitor if the voltage across the capacitor reaches a threshold voltage, at which point the next value in the sequence is selected to determine the next charging time. A square-wave clock signal having spread-spectrum characteristics is generated in the oscillator by using the series of charge-discharge cycles corresponding to the sequence of randomly selected values to toggle a flip-flop operating as a delay line and zero-order hold.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: March 17, 2009
    Assignee: Agere Systems Inc.
    Inventors: Chaitanya Chava, Douglas D. Lopata
  • Switched-current oscillator for clock-frequency spreading
    Publication number: 20080130712
    Abstract: A switched-current oscillator having a dc current source adapted to charge a capacitor so that the capacitor charging time is controlled based on a sequence of (pseudo)randomly selected values, each of those values defining a corresponding charging time. A discharge device is adapted to discharge the capacitor if the voltage across the capacitor reaches a threshold voltage, at which point the next value in the sequence is selected to determine the next charging time. A square-wave clock signal having spread-spectrum characteristics is generated in the oscillator by using the series of charge-discharge cycles corresponding to the sequence of randomly selected values to toggle a flip-flop operating as a delay line and zero-order hold.
    Type: Application
    Filed: October 30, 2006
    Publication date: June 5, 2008
    Inventors: Chaitanya Chava, Douglas D. Lopata