Patents by Inventor Matthew G. Hagman

Matthew G. Hagman 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 for stabilizing the gain of a discrete-state automatic gain control circuit
    Patent number: 9654070
    Abstract: An automatic gain controller comprises an amplifier including a variable gain. A resonant low-pass filter includes an input coupled to an output of the amplifier. The resonant low-pass filter is a second order low-pass filter. The second order low-pass filter includes a Sallen-Key topology. The Sallen-Key topology comprises a quality factor between 1.4 and 1.6. A threshold detection circuit includes an input coupled to an output of the second order low-pass filter to compare an output signal of the second order low-pass filter to a threshold and an output of the threshold detection circuit coupled to control the variable gain of the amplifier. A state machine is coupled between the output of the threshold detection circuit and the amplifier. The state machine is configured to transition based on a current state of the state machine. The resonant low-pass filter exhibits overshoot to trigger a hysteresis of the threshold detection circuit.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: May 16, 2017
    Assignee: Semtech Corporation
    Inventors: Ryan P. MacDonald, Matthew G. Hagman
  • Method for Stabilizing the Gain of a Discrete-State Automatic Gain Control Circuit
    Publication number: 20160344359
    Abstract: An automatic gain controller comprises an amplifier including a variable gain. A resonant low-pass filter includes an input coupled to an output of the amplifier. The resonant low-pass filter is a second order low-pass filter. The second order low-pass filter includes a Sallen-Key topology. The Sallen-Key topology comprises a quality factor between 1.4 and 1.6. A threshold detection circuit includes an input coupled to an output of the second order low-pass filter to compare an output signal of the second order low-pass filter to a threshold and an output of the threshold detection circuit coupled to control the variable gain of the amplifier. A state machine is coupled between the output of the threshold detection circuit and the amplifier. The state machine is configured to transition based on a current state of the state machine. The resonant low-pass filter exhibits overshoot to trigger a hysteresis of the threshold detection circuit.
    Type: Application
    Filed: May 22, 2015
    Publication date: November 24, 2016
    Applicant: SEMTECH CORPORATION
    Inventors: Ryan P. MacDonald, Matthew G. Hagman