Patents by Inventor Eric Walburger

Eric Walburger 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).

  • Thermal feedback for switch mode amplification
    Patent number: 8447050
    Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: May 21, 2013
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode, Eric Walburger, Wilson E. Taylor, Jr.
  • Thermal Feedback for Switch Mode Amplification
    Publication number: 20110075723
    Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.
    Type: Application
    Filed: October 21, 2010
    Publication date: March 31, 2011
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode, Eric Walburger, Wilson E. Taylor, JR.
  • Thermal feedback for switch mode amplification
    Patent number: 7840015
    Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: November 23, 2010
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode, Eric Walburger, Wilson E. Taylor, Jr.
  • Circuits and methods for slew rate control and current limiting in switch-mode systems
    Patent number: 6597240
    Abstract: An apparatus and method for limiting the output current in a switched mode amplifier are implemented. The apparatus includes a driver amplifier configurable for selective operation in one of three modes. The amplifier is operable for transitioning between the first mode and one of the second and third modes in response to a state of an output node of the driver. Bias circuitry, configurable for selective coupling to the driver amplifier is operable for limiting the output current of the amplifier in the first operating mode.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: July 22, 2003
    Assignee: Cirrus Logic, Inc.
    Inventors: Eric Walburger, John Laurence Melanson
  • Transient noise reduction circuits, systems and methods in power digital-to-analog converters
    Patent number: 6538590
    Abstract: A system for suppressing transient noise in switched-mode amplifier systems is disclosed. An amplifier, for amplifying a signal from a digital signal source includes a first complementary metal oxide semiconductor field effect transistor (MOSFET) pair. A common node of the pair is serially coupled to an output node of the amplifier by a resistor. The first MOSFET pair is configured to drive a ramp on the output node of the amplifier.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: March 25, 2003
    Assignee: Cirrus Logic, Inc.
    Inventors: Johann Guy Gaboriau, Eric Walburger, John Laurence Melanson, Xiaofan Fei
  • Circuits and methods for output impedance matching in switched mode circuits
    Patent number: 6529074
    Abstract: An output stage 300 includes a first output switch 201 having a current path for driving an output from a first voltage rail and a second output switch 202 having a current path for selectively driving the output from a second voltage rail. A first reference switch 301 is scaled with respects to first output switch 201 and has a current path coupled to the first voltage rail. A second reference switch 302 scaled with respects to second output switch 202 has a current path coupled to a current path of first reference switch 301 at a node and the second voltage rail. The logic measures an impedance mismatch between first and second reference switches 301, 302 and proportionally varies the impedance of a selected one of first and second output switches 201, 202 in response.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: March 4, 2003
    Assignee: Cirrus Logic, Inc.
    Inventors: John Laurence Melanson, Eric Walburger, Johann Guy Gaboriau
  • Circuits systems and methods for power digital-to-analog converter protection
    Patent number: 6522273
    Abstract: An apparatus and method for power digital-to-analog converter protection are implemented. An attenuation value is set in response to the value of the supply voltage. The attenuation value is provided to a gain control, along with the input signal. A gain, offset by the attenuation value, determines the gain-adjusted output signal of the gain control generated from the input signal.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: February 18, 2003
    Assignee: Cirrus Logic, Inc.
    Inventors: Xiaofan Fei, Johann Guy Gaboriau, Jason Powell Rhode, John Laurence Melanson, Eric Walburger