Patents by Inventor Masami Muranaka

Masami Muranaka 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).

  • Electric circuit fabricated from magneto-resistive elements and active circuit elements
    Patent number: 5168244
    Abstract: A differential amplifier circuit comprises a current mirror circuit associated with an electric power source, and an amplifier circuit for developing differential voltage produced between a pair of output nodes of the current mirror circuit, and the current mirror circuit is implemented by a first series combination of a first magneto-resistive element, a first bipolar transistor and a second magneto-resistive element and a second series combination of a third magneto-resistive element, a second bipolar transistor and a fourth magneto-resistive element, wherein the first to fourth magneto-resistive elements are arranged in such a manner that variation of magnetic field has the same influence on the first and fourth magneto-resistive elements and on the second and third magneto-resistive elements so that the characteristics of the current mirror circuit is hardly affected by fluctuation of device characteristics of either first or second bipolar transistor.
    Type: Grant
    Filed: June 9, 1992
    Date of Patent: December 1, 1992
    Assignee: NEC Corporation
    Inventor: Masami Muranaka