Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1998-02-02
1999-10-19
Pascal, Robert
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330151, H03F 126, H03F 100
Patent
active
059695722
ABSTRACT:
A feedforward-type linear power amplifier directly compares amplitude and phase of a signal applied to one input end of a first signal canceler with amplitude and phase of a signal applied to another input end of the first signal canceler, and according to the comparison results, controls a first variable attenuator and a first variable phase shifter disposed in a pre-stage of the first signal canceler so that the first signal canceler extracts only the intermodulation distortion signals generated while a main power amplifier amplifies the RF input signal. Then, the linear power amplifier directly compares amplitude and phase of the intermodulation distortion signal on a main path with amplitude and phase of the intermodulation distortion signal on a sub path, and according thereto, controls a third variable attenuator and a third variable phase shifter to cancel the intermodulation distortion signals contained in the RF output signal of the main power amplifier.
REFERENCES:
patent: 5304945 (1994-04-01), Myer
patent: 5867064 (1999-02-01), Van Horn et al.
patent: 5874856 (1999-02-01), Van Horn
Chang Ik-Soo
Jeong Yong-chae
Kim Young
Nguyen Patricia T.
Pascal Robert
Samsung Electronics Co,. Ltd.
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