Patents Assigned to Aval Communications Inc.
  • Cancellation loop, for a feed-forward amplifier, employing an adaptive controller
    Patent number: 5610554
    Abstract: An adaptive control system and method is provided in a feed-forward linear amplifier, and in particular a multi-channel linear amplifier, wherein analyzed distortion or error detection of nonlinear distortion components of the output signal of a main amplifier element is used to correct distortion in amplification of an information signal using a two-stage distortion correction circuit. Analysis of the distortion is based on a sweep of the entire operating frequency band from which the distortion components are extracted. I.F. sampling (sub-harmonic sampling) may be used in analog-to-digital conversion of an I.F. signal to detect the distortion within a pass-band.
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: March 11, 1997
    Assignee: Aval Communications Inc.
    Inventor: Kiomars Anvari
  • Ultra-linear feedforward amplifier with adaptive control and method for adaptive control
    Patent number: 5594385
    Abstract: An adaptive control system and method is provided in a feed-forward linear amplifier, and in particular a multi-channel linear amplifier, wherein analyzed distortion or error detection of nonlinear distortion components of the output signal of a main amplifier element is used to correct distortion in amplification of an information signal. Analysis of the distortion is based on a sweep of the entire operating frequency band from which the distortion components are extracted. I.F. sampling (sub-harmonic sampling) may be used in analog-to-digital conversion of an I.F. signal to detect the distortion within a pass-band.
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: January 14, 1997
    Assignee: Aval Communications, Inc.
    Inventor: Kiomars Anvari
  • Feed-forward power amplifier system with adaptive control and control method
    Patent number: 5485120
    Abstract: An adaptive control system and method for use with a feed-forward linear amplifier, and in particular a multi-channel linear amplifier wherein a distortion (error) detection circuit is used for detecting a nonlinear distortion component of a main amplifier output for using in correcting distortion in amplifying an information signal. The distortion correction can be extracted from a pilot signal, an analysis of distortion from a channel-by-channel sweep or from analysis of selected target channels. Analysis can be based on a single signal, an average of many signals, or a selection of maxima of one or many signals. Subharmonic sampling may be used in analog to digital conversion of an IF signal to detect for distortion within a passband.
    Type: Grant
    Filed: July 28, 1994
    Date of Patent: January 16, 1996
    Assignee: Aval Communications Inc.
    Inventor: Kiomars Anvari