Patents by Inventor Chirag Sthalekar

Chirag Sthalekar 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).

  • In-situ measurement of the delay between the envelope and the RF signal in envelope-tracking systems
    Patent number: 10992308
    Abstract: An in-situ delay measurement is performed for an envelope-tracking power amplifier of an RF input signal. Because the delay measurement is in-situ, the delay measurement avoids the necessity to down convert and digitize a version of an RF output signal from the envelope-tracking power amplifier.
    Type: Grant
    Filed: April 29, 2020
    Date of Patent: April 27, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Chirag Sthalekar, Leon Metreaud, Hakan Inanoglu, Xiangdong Zhang
  • System and method for measuring phase delay and amplitude of an optical signal in animal tissue
    Patent number: 10561319
    Abstract: A system and method, for measuring phase delay and amplitude of a near infrared signal emanating from tissue of an animal subject in response a near infrared signal input to such tissue, operate by processing a signal from an optical detector and a corresponding signal from an optical detector emulation circuit. In some aspects, the processed signals are fed into a phase delay detection system that provides an output thereof a digital measure of the phase delay of the received optical signal.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: February 18, 2020
    Assignee: Tufts University
    Inventors: Valencia Koomson, Chirag Sthalekar
  • System and Method for Measuring Phase Delay and Amplitude of an Optical Signal in Animal Tissue
    Publication number: 20190110688
    Abstract: A system and method, for measuring phase delay and amplitude of a near infrared signal emanating from tissue of an animal subject in response a near infrared signal input to such tissue, operate by processing a signal from an optical detector and a corresponding signal from an optical detector emulation circuit. In some aspects, the processed signals are fed into a phase delay detection system that provides an output thereof a digital measure of the phase delay of the received optical signal.
    Type: Application
    Filed: December 21, 2018
    Publication date: April 18, 2019
    Inventors: Valencia Koomson, Chirag Sthalekar
  • System and method for measuring phase delay and amplitude of a near infra-red signal in animal tissue
    Patent number: 10194806
    Abstract: A system and method, for measuring phase delay and amplitude of a near infrared signal emanating from tissue of an animal subject in response a near infrared signal input to such tissue, operate by processing a signal from an optical detector and a corresponding signal from an optical detector emulation circuit. In some aspects, the processed signals are fed into zero crossing detectors that in turn feed a time-to-digital converter providing at an output thereof a digital measure of the phase delay of the received optical signal.
    Type: Grant
    Filed: February 4, 2015
    Date of Patent: February 5, 2019
    Assignee: Tufts University
    Inventors: Valencia Koomson, Chirag Sthalekar
  • System and Method for Measuring Phase Delay and Amplitude of a Near Infra-Red Signal in Animal Tissue
    Publication number: 20170172417
    Abstract: A system and method, for measuring phase delay and amplitude of a near infrared signal emanating from tissue of an animal subject in response a near infrared signal input to such tissue, operate by processing a signal from an optical detector and a corresponding signal from an optical detector emulation circuit. In some aspects, the processed signals are fed into zero crossing detectors that in turn feed a time-to-digital converter providing at an output thereof a digital measure of the phase delay of the received optical signal.
    Type: Application
    Filed: February 4, 2015
    Publication date: June 22, 2017
    Inventors: Valencia Koomson, Chirag Sthalekar