Amplifiers – With pilot frequency control means
Patent
1995-03-29
1996-11-12
Mullins, James B.
Amplifiers
With pilot frequency control means
330151, H03F 132
Patent
active
055744001
ABSTRACT:
A first pilot signal is superimposed onto an input signal thereto to distribute the signal as a first signal and a second signal to two destinations. The first signal is fed via an equalizer to a main amplifier for amplification thereof such that a second pilot signal is mixed with the amplified signal to attain a main amplification signal. Subtraction is conducted between the second signal and the main amplification signal to extract a distortion signal to be fed via an equalizer to an auxiliary amplifier so as to produce an auxiliary amplification signal. Between the main and auxiliary amplification signals, there is effected subtraction to attain a differential signal. The pilot signals are detected according to the differential and output signals. The equalizers are controlled to set the pilot signals to a minimum value. Consequently, there is achieved a linear amplifier obtaining a stable amplification signal with reduced distortion in a wide band.
REFERENCES:
patent: 4412185 (1983-10-01), Gerard
patent: 4595882 (1986-06-01), Silagi et al.
patent: 5166634 (1992-11-01), Narahashi et al.
Japanese Patent Laid-Open Hei-1-198809, Aug. 10, 1989.
Mullins James B.
NEC Corporation
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