Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1995-07-27
1997-02-25
Mottola, Steven
Amplifiers
Hum or noise or distortion bucking introduced into signal...
H03F 126
Patent
active
056062869
ABSTRACT:
A linearizer has a dividing system for dividing a radio frequency signal into a first, second and third part. First and second transfer devices, each driven by the dividing system, can separately amplify the first and the second part of the signal. The first transfer device produces a higher distortion than the second with a distortion-producing, conditioning device. The second transfer device has, with respect to undistorted output components, a transfer characteristic whose output phase and amplitude substantially tracks that of the conditioning device during variations in amplitude. The first transfer device also has a retarding device serially coupled with the conditioning device for retarding signals handled at the conditioning device to produce approximately a 180 degree phase shift between the outputs of the first and the second transfer devices. A third transfer device is driven by the third part of the radio frequency signal from the dividing system. A first Wilkinson combiner coupled to the outputs of the first and the second transfer devices can produce a distortion signal corresponding to a combination of signals on the outputs of the first and the second transfer devices. A second Wilkinson combiner can combine the distortion signal with the signal on the output of the third transfer device to provide a predistortion signal.
REFERENCES:
patent: 5117197 (1992-05-01), Hsu et al.
patent: 5363056 (1994-11-01), Blauvelt
patent: 5444418 (1995-08-01), Mitzlaff
Adams, Esq. Thomas L.
Mottola Steven
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