Feed forward amplification apparatus for compensating...

Details Feed forward amplification apparatus for compensating... Feed forward amplification apparatus for compensating...

2005-03-01

2005-03-01

Choe, Henry (Department: 2817)

Amplifiers

With amplifier bypass means

C330S149000

Reexamination Certificate

active

06861904

ABSTRACT:
A feed forward type distortion compensation amplification apparatus includes a first division unit for dividing an input signal into a first channel signal and a second channel signal, a main amplifier for amplifying the first channel signal, a variable attenuation unit for processing the second channel signal to provide an amplitude adjusted second channel signal, a delay unit for delaying the amplitude adjusted second channel signal, a second division unit for dividing an output signal of the main amplifier into a third channel signal and a fourth channel signal and subtracting one of the third channel signal and the delayed second channel signal from the other to extract a distortion component introduced by the main amplifier, and a distortion compensation unit for removing a distortion component introduced into the fourth channel signal by the main amplifier, by using the distortion component extracted by the second division unit.

REFERENCES:
patent: 4943783 (1990-07-01), Nojima
patent: 5576659 (1996-11-01), Kenington et al.
patent: 6133791 (2000-10-01), Horiguchi et al.

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