Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1988-10-31
1989-11-07
Mullins, James B.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330151, H03F 132
Patent
active
048795194
ABSTRACT:
A distortion compensation circuit for power amplifier producing a prescribed distortion component receives an input signal having at least one carrier therein in a prescribed frequency range. The input signal is applied to a first circuit path having an amplifier that produces an amplified signal with the prescribed distortion component and to a second circuit path that delays the input signal without distortion. The output signals of the first and second circuit paths are combined in a first combiner to form a signal representative of the prescribed distortion component. A second combiner forms a signal having an amplified input signal component and inverted phase prescribed distortion component responsive to the output of the first combiner and the output the first circuit path. To eliminate signals other than the distortion component from the first combiner, the prescribed frequency range is scanned to detect a carrier signal and the amplitude and phase of the signal in the second circuit path is modified to remove the detected carrier from the output of the first combiner. Remaining distortion in the power amplifier output is removed by scanning the prescribed frequency range to detect an intermodulation product signal and modifying the amplitude and phase of the first combiner output to minimize the detected intermodulation product signal.
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patent: 4554514 (1985-11-01), Whartenby et al.
American Telephone and Telegraph Company, AT&T Bell Labs
Cubert Jack S.
Mullins James B.
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