Patents by Inventor Gert Bierkarre

Gert Bierkarre 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).

  • Constant current supply circuit with stabilization based on voltage and current ratios relative to a reference voltage and a related control current
    Patent number: 5712557
    Abstract: A circuit arrangement for supplying a constant current which is stabilized against temperature variations. The constant current is produced by a current source which is controlled by a control stage in which a first control current is supplied to each of a first and a second resistor, at least one of which is trimmable. The first control current is controlled so that the difference between the voltages produced thereby across the first and second resistors is in a first predetermined ratio to the constant voltage produced by a reference voltage source. The current source is controlled by the control stage so that the constant current produced thereby is in a second predetermined ratio to the first control currents.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: January 27, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Holger Gehrt, Wolfgang Schnitt, Joachim Utzig, Gert Bierkarre