Lucent Technologies Inc.

Andrew Corporation

Michael Rauh

Michael Gordon Kossor

Robert T Whitacre

A feed-forward amplifier includes a main amplifier having input signals and amplified output signals and an error amplifier for amplifying distortion signals to be added to the amplified output signals of the main amplifier to produce an amplifier output. A pilot tone modulation and recovery circuit modulates a pilot tone to be coupled to the input signals of the main amplifier and recovers the pilot tone from the amplifier output. The pilot tone modulation and recovery circuit includes a digital filter and a signal source. The signal source is used to both modulate the pilot tone and control the digital filter for recovering the pilot tone.

Apparatus and method for processing of amplifier linearization signals

A CDMA base station transmitter employing the Kahn envelope-elimination-and-restoration technique includes a switching amplifier adapted to linearly amplify the low-level baseband signal derived from the digital amplitude information portion of the digital CDMA signal to be transmitted downlink. In order to achieve the wide bandwidth and high dynamic range needed to linearly amplify the low-level baseband signal derived from the digital amplitude portion of the CDMA signal, a truncating circuit truncates a predetermined number of the least significant bits of each word of the digital amplitude portion before the amplitude portion is converted to a low-level baseband signal and is amplified by the switching amplifier. High resolution is restored to the amplified output by a power-dissipating post regulator at the output of the switching amplifier.

Growing community of inventors

Canal Winchester, OH, United States of America

Michael Rauh