Patents by Inventor John T. Carlsson

John T. Carlsson 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).

  • Arrangement for eliminating offset errors in a power control circuit of a pulsed transmitter final amplifier
    Patent number: 5304947
    Abstract: A high frequency power amplifier amplifies periodic signals in the form of HF bursts. The power output of the amplifier is adjusted by a control loop which produces a control signal in response to a comparison made between a set-point value (BV) and the actual power output (Put) of the amplifier and applies the signal to the power amplifier. The control loop includes a differential amplifier. A correction circuit measures the output voltage of the differential amplifier over a time period (t.sub.1 to t.sub.2) prior to each HF burst and stores in a memory (C) a magnitude proportional to this output voltage. During the following HF burst, this magnitude is used to introduce into the control loop a correction magnitude (Ukorr) for correction of offset voltages (Uoff) occurring in the control loop.
    Type: Grant
    Filed: March 12, 1993
    Date of Patent: April 19, 1994
    Assignee: Ericsson Ge Mobile Communications, Inc.
    Inventor: John T. Carlsson