Patents Represented by Attorney, Agent or Law Firm Bradley J. Botsch, Sr.
  • Patent number: 5166983
    Abstract: A mute circuit for an audio amplifier has been provided. The mute circuit alternately switches from a normal mode of operation to a mute mode of operation. In the normal mode of operation, the mute circuit utilizes a first op amp circuit to amplify an input signal by a predetermined factor. In the mute mode of operation, the mute circuit utilizes a second op amp circuit which is configured as an unity gain amplifier. In the mute mode, DC shifts occurring at the output of the second op amp circuit are minimized. Further, the second op amp circuit has a low output impedance thereby providing excellent attenuation of an audio input signal when the mute circuit is utilized in an audio amplifier application.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: November 24, 1992
    Assignee: Motorola, Inc.
    Inventor: David M. Susak