Patents by Inventor Karl Stefan Barkaro

Karl Stefan Barkaro 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).

  • xDSL-line-interface-circuit
    Patent number: 7801296
    Abstract: at least one self oscillating loop circuit which oscillates with a switching frequency (fs), wherein the self oscillating loop circuit (18, 19, 20) comprises an output driver (19) which is switched with said switching frequency and a loop filter (20) which feeds back an amplified loop signal output by said driver (19) to an input of said self oscillating loop and a trimming circuit (21) for trimming the switching frequency (fs) of said self oscillating loop circuit.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: September 21, 2010
    Assignee: Infineon Technologies AG
    Inventors: Karl Stefan Barkarö, Bo Bokinge, Jörg Hauptmann, Karl-Mikael Johanson, Lars Karlsson, Torbjörn Ivar Randahl
  • Class D-amplifier
    Patent number: 7282992
    Abstract: A class D-amplifier which amplifies an input signal applied to an signal input of said amplifier (21) to generate an amplified signal output by an signal output (28a, 28b) of said amplifier comprising a comparator (23) which compares the applied input signal with a switch signal to generate a pulse width modulated signal; a driving unit (24) which amplifies the pulse width modulated signal to generate the amplified output signal; and a feedback circuit which generates the self oscillating switch signal for the comparator (23).
    Type: Grant
    Filed: June 15, 2005
    Date of Patent: October 16, 2007
    Assignee: Infineon Technologies AG
    Inventors: Karl Stefan Barkaro, Bo Bokinge, Carl-Mikael Johansson, Lars Karlsson, Torbjorn Ivar Randahl, Andreas Wiesbauer