Patents by Inventor Erwin Ofner

Erwin Ofner 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).

  • Differential operational amplifier with common mode feedback
    Patent number: 4533876
    Abstract: A differential operational amplifier is provided with a feedback loop which continuously adjusts the common mode voltage level of the amplifier so that it lies in the center of the dynamic range of the amplifier. The feedback loop measures the instantaneous common mode voltage level and compares it with a reference voltage which is set to reflect the desired common mode voltage. An error signal is generated and fed back into the amplifier to adjust the instantaneous common mode voltage level towards the reference level. Frequency compensation is also provided to overcome the phase shift introduced by the use of RC networks.
    Type: Grant
    Filed: October 18, 1983
    Date of Patent: August 6, 1985
    Assignee: American Microsystems, Inc.
    Inventors: Yusuf Haque, Erwin Ofner