Patents by Inventor William Z. Johnson

William Z. Johnson 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).

  • Audio amplifier with amplified feedback
    Patent number: 5266905
    Abstract: An audio amplifier with amplified feedback having a discrete component amplifier and an amplified negative feedback network. The amplified negative feedback network includes a feedback amplifier, a first resistor network, a second resistor network and a further feedback means for providing local negative feedback to the feedback amplifier and substantially removes a load associated with the output of the discrete component amplifier.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: November 30, 1993
    Assignee: Audio Research Corporation
    Inventor: William Z. Johnson
  • Cascode amplifier
    Patent number: 4647872
    Abstract: A stabilized Cascode Amplifier Circuit wherein the grid or gate control of the second stage of the cascaded input is provided by feedback of a portion of the output signal voltage. The circuit can be further enhanced by the inclusion of a unity gain follower between the first and third stage of the cascode amplifier circuit.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: March 3, 1987
    Inventor: William Z. Johnson