High dynamic range modulation independent feed forward amplifier

Details High dynamic range modulation independent feed forward amplifier High dynamic range modulation independent feed forward amplifier

1992-03-20

1994-04-26

Mottola, Steven

Amplifiers

With pilot frequency control means

330151, H03F 366, H03F 126

Patent

active

053070224

ABSTRACT:
Briefly described the present invention is a feed forward amplifier network (200) employing a frequency swept pilot tone signal (212) in order to reduce the distortion generated by the network's power amplifier (202). Initially a composite input signal (216) comprising either wide (520) and/or narrow (510) bandwidth modulation formats is input into the network (200). In addition, the frequency swept pilot tone (212), generated for example by a variable frequency oscillator (213), is injected into the input path of the power amplifier (202). Thereafter, distortion cancellation is employed to generate an amplified output signal (217) having output components (510,520) which replicate those within the input signal (216). Thereafter, pilot tone power is detected (by 215) within the amplifier passband where the output components (510,520) are absent, in order to ascertain the average pilot tone power remaining within the amplified output signal (217). In response to this detection, various amplifier network characteristics are adjusted (by 214, 208 and 209) in order to reduce the amount of pilot tone at the amplifier network output (217).

REFERENCES:
patent: 3202928 (1965-08-01), Prior
patent: 3815040 (1974-06-01), Seidel
patent: 3922617 (1975-11-01), Denniston 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: 5130663 (1992-07-01), Tattersall, Jr.

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