Patents by Inventor Werner Berkel

Werner Berkel 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).

  • Output amplifier
    Patent number: 4929907
    Abstract: An output amplifier for pulse generators comprises a first differential bipolar transistor amplifier stage for amplifying complementary voltage pulses and a second gallium arsenide field-effect (GaAs FET) transistor stage with two GaAs FET transistors wired as a common gate stage having a constant voltage bias. The GaAs FET transistor amplifier stage, responsive to the first amplifier stage, is used to generate high output voltage swings having fast transition times over a wide frequency band, whereas the bipolar transistor amplifier stage provides high gain and compensation of the GaAs anomalies.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: May 29, 1990
    Assignee: Hewlett-Packard Company
    Inventor: Werner Berkel