Patents Assigned to Datum Telegraphic, INC
  • Use of antiphase signals for predistortion training within an amplifier system
    Patent number: 6313703
    Abstract: A LINC amplifier of a radio frequency transmitter provides substantially linear amplification from two nonlinear amplifiers by decomposing the original signal into two constant amplitude envelope, phase varying signals, which, when combined, constructively and destructively interfere to re-form the original signal. The output of the LINC amplifier, which is to be transmitted via an antenna, is an amplified form of the original signal. The LINC amplifier uses a digital control mechanism to control and adapt a digital compensation network that directly compensates for the imperfections of the analog RF environment, including the amplifiers. The mechanism monitors the combined amplifier output and adjusts the signal components in order to precisely compensate for any differences in the characteristics of the separate signal paths which would cause the combination not to accurately represent the original signal.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: November 6, 2001
    Assignee: Datum Telegraphic, INC
    Inventors: Andrew S. Wright, Steven J. Bennett
  • Digital control of a linc linear power amplifier
    Patent number: 6054894
    Abstract: The inventive LINC amplifier provides substantially linear amplification from two nonlinear amplifiers by decomposing the original signal into two constant amplitude envelope, phase varying signals, which, when combined, constructively and destructively interfere to re-form the original signal. The output of the LINC amplifier, which is to be transmitted via an antenna, is an amplified form of the original signal. The inventive LINC amplifier utilizes a digital control mechanism to control and adapt a digital compensation network that directly compensates for the imperfections of the analog RF environment, including the amplifiers. The mechanism monitors the combined amplifier output and adjusts the signal components in order to precisely compensate for any differences in the characteristics of the separate signal paths which would cause the combination not to accurately represent the original signal.
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: April 25, 2000
    Assignee: Datum Telegraphic Inc.
    Inventors: Andrew S. Wright, Steven J. Bennett
  • Controller and associated methods for a linc linear power amplifier
    Patent number: 6054896
    Abstract: A LINC amplifier of a radio frequency transmitter provides substantially linear amplification from two nonlinear amplifiers by decomposing the original signal into two constant amplitude envelope, phase varying signals, which, when combined, constructively and destructively interfere to re-form the original signal. The output of the LINC amplifier, which is to be transmitted via an antenna, is an amplified form of the original signal. The LINC amplifier uses a digital control mechanism to control and adapt a digital compensation network that directly compensates for the imperfections of the analog RF environment, including the amplifiers. The mechanism monitors the combined amplifier output and adjusts the signal components in order to precisely compensate for any differences in the characteristics of the separate signal paths which would cause the combination not to accurately represent the original signal.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: April 25, 2000
    Assignee: Datum Telegraphic Inc.
    Inventors: Andrew S. Wright, Steven J. Bennett
  • Compensation system and methods for a linear power amplifier
    Patent number: 5990738
    Abstract: A LINC amplifier of a radio frequency transmitter provides substantially linear amplification from two nonlinear amplifiers by decomposing the original signal into two constant amplitude envelope, phase varying signals, which, when combined, constructively and destructively interfere to re-form the original signal. The output of the LINC amplifier, which is to be transmitted via an antenna, is an amplified form of the original signal. The LINC amplifier uses a digital control mechanism to control and adapt a digital compensation network that directly compensates for the imperfections of the analog RF environment, including the amplifiers. The mechanism monitors the combined amplifier output and adjusts the signal components in order to precisely compensate for any differences in the characteristics of the separate signal paths which would cause the combination not to accurately represent the original signal.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: November 23, 1999
    Assignee: Datum Telegraphic Inc.
    Inventors: Andrew S. Wright, Steven J. Bennett
  • System and methods for stimulating and training a power amplifier during non-transmission events
    Patent number: 5990734
    Abstract: A LINC amplifier of a radio frequency transmitter provides substantially linear amplification from two nonlinear amplifiers by decomposing the original signal into two constant amplitude envelope, phase varying signals, which, when combined, constructively and destructively interfere to re-form the original signal. The output of the LINC amplifier, which is to be transmitted via an antenna, is an amplified form of the original signal. The LINC amplifier uses a digital control mechanism to control and adapt a digital compensation network that directly compensates for the imperfections of the analog RF environment, including the amplifiers. The mechanism monitors the combined amplifier output and adjusts the signal components in order to precisely compensate for any differences in the characteristics of the separate signal paths which would cause the combination not to accurately represent the original signal.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: November 23, 1999
    Assignee: Datum Telegraphic Inc.
    Inventors: Andrew S. Wright, Steven J. Bennett