Patents by Inventor Ian Stuart Parry

Ian Stuart Parry 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).

  • On-line calibration of linear amplifiers
    Patent number: 6429736
    Abstract: A cartesian amplifier system for pre-distorting a signal to be amplified to take account of non-linearities and other non-ideal characteristics of the amplifier itself. A signal to be amplified is divided into quadrature and in-phase signal components in a digital signal processor 1. The processor 1 also pre-distorts the resolved quadrature and in-phase components using various pre-distortion factors. These pre-distortion factors are derived on the basis of a feedback signal from a measurement of the output signal power from the amplifier and on the basis of the signal levels of the pre-distorted resolved components themselves. These pre-distortion factors are constantly updated, thus taking into account any shifts in the non-ideal characteristics of the amplifier.
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: August 6, 2002
    Assignee: Securicor Wireless Technology Limited
    Inventors: Ian Stuart Parry, Richard Arthur Hillum