Patents by Inventor Michael H. Metcalf

Michael H. Metcalf 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).

  • Temperature compensated current source
    Patent number: 4786856
    Abstract: A current source provides an output current whose magnitude is substantially independent of changes in temperature. In each of three embodiments (50, 100, 120), one or more bipolar transistors are employed to provide a compensating current which is dependent on the base-to-emitter voltages, V.sub.BE, of such bipolar transistors. The compensating current changes with temperature so as to offset changes in the uncompensated output current so that the total output current is substantially independent of V.sub.BE. The three embodiments employ current mirror circuits (10, 122) that provide a current source of simple circuit design that is operable with the use of a single power supply at a relatively low voltage.
    Type: Grant
    Filed: May 10, 1988
    Date of Patent: November 22, 1988
    Assignee: Tektronix, Inc.
    Inventors: Michael H. Metcalf, Stewart S. Taylor