Patents by Inventor John Laurance Melanson

John Laurance Melanson 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).

  • Circuits and methods for minimizing chopping artifacts at the output of a chopper-stabilized operational amplifier
    Patent number: 7262654
    Abstract: An operational amplifier including at least one amplifier stage and chopping circuitry for chopping an input signal to the amplifier stage and an output signal from the chopping signal having a frequency randomly varying within the selected frequency band.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: August 28, 2007
    Assignee: Cirrus Logic, Inc.
    Inventors: Murari Kejariwal, Gowtham Vemulapalli, John Laurance Melanson
  • Multiple-stage operational amplifier and methods and systems utilizing the same
    Patent number: 7202746
    Abstract: A multiple-stage operational amplifier including a gain stage for amplifying an input signal and implementing a dominant pole producing a frequency response having a gain roll-off with frequency and a unity gain frequency. An intermediate stage is coupled to an output of the gain stage and has a high input impedance and a low output impedance. A high gain amplifier configured as a low gain output stage using resistive feedback and coupled to an output of the intermediate stage drives an output of the operational amplifier and implements a dominant pole at a frequency substantially higher than the unity gain frequency implemented by the dominant pole implemented the gain stage.
    Type: Grant
    Filed: December 14, 2004
    Date of Patent: April 10, 2007
    Assignee: Cirrus Logic, Inc.
    Inventors: Murari Kejariwal, Gowtham Vemulapalli, John Laurance Melanson