Patents by Inventor Johannes M. Menting

Johannes M. Menting 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).

  • Gamma correction circuit
    Patent number: 4847524
    Abstract: A gamma correction circuit is formed with several differential amplifiers (6-10) and (11-15) each being capable of being driven into saturation with a different saturation current supplied by a current source at a different signal value (Vx and Vw, respectively) in an input signal (PV). The non-linearly changing output currents of the differential amplifiers are added with the aid of a current-mirror circuit (16-21) which is also active as a supply circuit for the differential amplifiers. The gamma-corrected output signal (PV') is obtained across a resistor (22) connected to a connection (17) of the current-mirror circuit. In the case of a changing temperature, a temperature compensation is required.
    Type: Grant
    Filed: March 4, 1987
    Date of Patent: July 11, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Johannes H. J. M. Van Rooy, Johannes M. Menting