Amplifiers – With pilot frequency control means
Patent
1994-08-19
1995-10-03
Mullins, James B.
Amplifiers
With pilot frequency control means
330151, H03F 132
Patent
active
054555370
ABSTRACT:
In a feed forward amplifier (100), a main amplifier (125) is coupled between an input (102) at which an input signal is received and an output (173) at which an output signal is provided. The output signal is an amplification of the input signal. A sample of the output signal is compared (144) with a sample of the input signal to produce a difference signal indicative of distortions introduced by the main amplifier (125). An error amplifier (165) provides a distortion signal which is an amplification of the difference signal, and the distortion signal is combined (169) with the output signal to compensate for main amplifier distortions. A random frequency, constant amplitude sine wave pilot signal is combined (117) with the input signal, and a correlation power detector (194,195,202,212,213) is provided to determine the magnitude of the pilot signal in the output signal. The gain and phase of the difference signal is then adjusted (155) to minimize the magnitude of the pilot signal in the output signal. Additionally, a distortion signal power signal, which is indicative of the magnitude of the difference signal, is provided (151,158), and the gain and phase of the input signal is adjusted (112) to minimize the magnitude of the distortion signal power signal.
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Larkin Robert S.
Wills David L.
Mullins James B.
Radio Frequency Systems Inc.
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