Patents by Inventor Douglas Matthew Johnson

Douglas Matthew 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).

  • Amplifier bias adjustment circuit to maintain high-output third-order intermodulation distortion performance
    Patent number: 6639466
    Abstract: An circuit and method are provided for amplifying RF input signal to produce RF output signals with third-order intermodulation distortion products. The circuit and method use a feedback signal to control the bias voltage of the amplifier, such that the output third-order intermodulation distortion product increases monotonically with the RF input signal power. Specifically, the third-order intermodulation distortion product responds over a predetermined output power range by increasing three decibels in response to each one-decibel increase in input power.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: October 28, 2003
    Assignee: Anadigics Inc.
    Inventor: Douglas Matthew Johnson
  • Amplifier bias adjustment circuit to maintain high-output third-order intermodulation distortion performance
    Publication number: 20030020540
    Abstract: An circuit and method are provided for amplifying RF input signal to produce RF output signals with third-order intermodulation distortion products. The circuit and method use a feedback signal to control the bias voltage of the amplifier, such that the output third-order intermodulation distortion product increases monotonically with the RF input signal power. Specifically, the third-order intermodulation distortion product responds over a predetermined output power range by increasing three decibels in response to each one-decibel increase in input power.
    Type: Application
    Filed: June 11, 2002
    Publication date: January 30, 2003
    Applicant: ANADIGICS, INC.
    Inventor: Douglas Matthew Johnson
  • Amplifier bias adjustment circuit to maintain high-output third-order intermodulation distortion performance
    Patent number: 6404284
    Abstract: An circuit and method are provided for amplifying RF input signal to produce RF output signals with third-order intermodulation distortion products. The circuit and method use a feedback signal to control the bias voltage of the amplifier, such that the output third-order intermodulation distortion product increases monotonically with the RF input signal power. Specifically, the third-order intermodulation distortion product responds over a predetermined output power range by increasing three decibels in response to each one-decibel increase in input power.
    Type: Grant
    Filed: April 19, 2001
    Date of Patent: June 11, 2002
    Assignee: Anadigics, Inc.
    Inventor: Douglas Matthew Johnson