Patents by Inventor Stefan Carlberg

Stefan Carlberg 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).

  • Frequency controlled switch
    Patent number: 5781039
    Abstract: A method and an apparatus in testing whether the frequency of an incoming signal is higher or lower than a predetermined value. The method only demands a capacitor (C), a resistor (R), a field effect transistor (Q) and a constant current generator (I). Because the included capacitor only needs to have a small value, a circuit design according to the method is very suitable for integration, for example, in form of a monolithic integrated circuit for frequency control in connection to DC/DC converters.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: July 14, 1998
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Stefan Carlberg