Patents by Inventor Luigi Cervi

Luigi Cervi 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).

  • Procedure and circuit for adaptive compensation of the gain distortions of a microwave amplifier with linearizer
    Patent number: 5598127
    Abstract: There are described a procedure and circuit for adaptive compensation of the gain distortions caused by thermal drift, ageing, etc., in microwave amplifiers connected to predistortion linearizers. The procedure concerns digitally modulated signals, e.g., QAM, in which the peak to average power signal ratio is constant. Since this ratio remains constant after amplification only if the amplifier is linear, it is measured at the amplifier output, to change the AM/FM distortion characteristic of the linearizer/amplifier chain and hold the ratio on the output equal to that on the input.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: January 28, 1997
    Assignee: Italtel S.p.A.
    Inventors: Antonio Abbiati, Carlo Buoli, Luigi Cervi
  • Predistortion linearizer for microwave power amplifiers
    Patent number: 5138275
    Abstract: A predistortion linearizer for microwave power amplifiers wherein a single transistor, e.g. of the GaAsFET type, is subpolarized near the pinch-off condition, and carries out the functions both of a gain expander amplifier for recovery of amplitude distortion of the power amplifier and as a command signal generator for a dephaser element for recovery of the phase distortion of the power amplifier.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: August 11, 1992
    Assignee: Siemens Telecommunicazioni S.p.A.
    Inventors: Antonio Abbiati, Carlo Buoli, Luigi Cervi