Amplifiers – With pilot frequency control means
Patent
1991-04-15
1992-07-14
Mottola, Steven
Amplifiers
With pilot frequency control means
330151, H03F 366, H03F 126
Patent
active
051306638
ABSTRACT:
Briefly described the present invention is a feed forward amplifier network employing a frequency swept pilot tone signal in order to reduce the distortion generated by the network's power amplifier. A frequency swept pilot tone, generated for example by a variable frequency oscillator, is injected into the input path of the power amplifier's input signal. Thereafter, distortion cancellation employed to generate an amplified output signal, substantially free of both pilot tone and the distortion signals generated by the power amplifier. The amplified output signal is then detected by a detector, phase locked to the variable frequency oscillator, in order to ascertain the average pilot tone energy remaining within the amplified output signal. In response to a detection, various amplifier network characteristics are adjusted in order to reduce the amount of pilot tone at the amplifier network output.
REFERENCES:
patent: 3815040 (1974-06-01), Seidel
patent: 4219780 (1980-08-01), Roulston et al.
patent: 4253072 (1981-02-01), Fisher et al.
patent: 4412185 (1983-10-01), Gerard
patent: 4580105 (1986-04-01), Myer
patent: 4879519 (1989-11-01), Myer
patent: 4885551 (1989-12-01), Myer
patent: 4994767 (1991-02-01), Hawkes
patent: 5023565 (1991-06-01), Liev
Hillman Val Jean F.
Motorola Inc.
Mottola Steven
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