Patents by Inventor Jinhua NI

Jinhua NI 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: 9264002
    Abstract: In certain applications, differential amplifiers with infinite common mode rejection ratios are desirable. However, resistance mismatches due to imperfections in the manufacturing create finite common mode rejection ratio in differential amplifiers degrading their performance. Disclosed are apparatus and method for improving the common mode rejection ratio of practical differential amplifiers.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: February 16, 2016
    Assignee: ANALOG DEVICES GLOBAL
    Inventors: Jinhua Ni, Dan Li
  • Publication number: 20150236662
    Abstract: In certain applications, differential amplifiers with infinite common mode rejection ratios are desirable. However, resistance mismatches due to imperfections in the manufacturing create finite common mode rejection ratio in differential amplifiers degrading their performance. Disclosed are apparatus and method for improving the common mode rejection ratio of practical differential amplifiers.
    Type: Application
    Filed: February 19, 2014
    Publication date: August 20, 2015
    Inventors: Jinhua Ni, Dan Li
  • Patent number: 8981844
    Abstract: An amplifier system may include a power stage having inputs for three different supply voltages and an output for coupling to a load, a controller to generate control signals to the power stage that cause the power stage to vary an output voltage applied to the load among more than three distinct voltage levels, a monitor to provide a first control signal to the controller based on an input voltage signal, and a feedback system to provide a second control signal to the controller based on comparison of the output voltage and the input signal.
    Type: Grant
    Filed: January 10, 2013
    Date of Patent: March 17, 2015
    Assignee: Analog Devices Global
    Inventors: Dan Li, Jinhua Ni
  • Publication number: 20150028823
    Abstract: A circuit may include a detector, a modulator, a switch, and a stabilizer. The detector may detect current supplied to an output of the circuit to generate an overcurrent signal. The modulator may modulate a pulse signal based upon the output of the circuit. The switch may control a power stage to generate the output of the circuit based upon the overcurrent signal and the pulse signal. The stabilizer may send an offset signal to the modulator. The stabilizer may generate the offset signal with a magnitude adjusted based upon the overcurrent signal, and the modulator may adjust the pulse signal based upon the offset signal.
    Type: Application
    Filed: July 24, 2013
    Publication date: January 29, 2015
    Applicant: ANALOG DEVICES TECHNOLOGY
    Inventors: Dan LI, Jinhua NI
  • Publication number: 20140191802
    Abstract: An amplifier system may include a power stage having inputs for three different supply voltages and an output for coupling to a load, a controller to generate control signals to the power stage that cause the power stage to vary an output voltage applied to the load among more than three distinct voltage levels, a monitor to provide a first control signal to the controller based on an input voltage signal, and a feedback system to provide a second control signal to the controller based on comparison of the output voltage and the input signal.
    Type: Application
    Filed: January 10, 2013
    Publication date: July 10, 2014
    Applicant: Analog Devices Technology
    Inventors: Dan Li, Jinhua Ni
  • Patent number: 8643436
    Abstract: Techniques to generate boosted multi-level switched output voltages from a boosted multi-level Class D amplifier. The amplifier may include a multi-level H-bridge, which may include pairs of transistor switches coupled to a first, second, and third supply potential. The second supply potential may be a boosted representation of the first supply potential. The amplifier may receive an input signal, and from the input signal may generate pulse-modulated control signals to control the switching for the transistor switches of the multi-level H-bridge. The amplifier may generate the boosted multi-level switched output voltages from output nodes of the multi-level H-bridge.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: February 4, 2014
    Assignee: Analog Devices, Inc.
    Inventors: Jinhua Ni, Dan Li
  • Publication number: 20130127530
    Abstract: Techniques to generate boosted multi-level switched output voltages from a boosted multi-level Class D amplifier. The amplifier may include a multi-level H-bridge, which may include pairs of transistor switches coupled to a first, second, and third supply potential. The second supply potential may be a boosted representation of the first supply potential. The amplifier may receive an input signal, and from the input signal may generate pulse-modulated control signals to control the switching for the transistor switches of the multi-level H-bridge. The amplifier may generate the boosted multi-level switched output voltages from output nodes of the multi-level H-bridge.
    Type: Application
    Filed: November 22, 2011
    Publication date: May 23, 2013
    Applicant: ANALOG DEVICES, INC.
    Inventors: Jinhua NI, Dan LI