Method and apparatus for reducing distortion in an output signal

Details Method and apparatus for reducing distortion in an output signal Method and apparatus for reducing distortion in an output signal

1994-10-31

1996-02-13

Mottola, Steven

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330151, H03F 126

Patent

active

054914540

ABSTRACT:
A feed forward amplifier network (100) employs a method (300) and apparatus for reducing distortion contained in an output signal (142) of an amplifier circuit (101). A modulator (118, 120) modulates (303) an input signal (141) of the amplifier circuit (101) with a reference modulation. The amplifier circuit (101) amplifies (305) the modulated signal, introducing nonlinear distortion in the process. A modulation determination circuit (107, 109, 115) determines (307) the reference modulation in the amplified signal and provides the determined modulation to an adjustment circuit (105). The adjustment circuit (131,133, 135) adjusts (309) a characteristic of the determined modulation in response to a control signal (153,155) and combines (137, 311) the adjusted modulation with the amplified signal (142) at the output of the amplifier circuit (101) to produce a corrected signal (151). A residual modulation detection circuit (139, 125, 127, 129) demodulates (313) the corrected signal (151) to recover any residual modulation remaining in the corrected signal (151) and adjusts (317) the control signal (153, 155) to reduce the recovered residual modulation.

REFERENCES:
patent: 4885551 (1989-12-01), Myer
patent: 5077532 (1991-12-01), Obermann et al.
patent: 5130663 (1992-07-01), Tattersall, Jr.
patent: 5307022 (1994-04-01), Tattersall, Jr. et al.
patent: 5386198 (1995-01-01), Ripstrand et al.
H. Seidel, "A Feed-Forward Experiment", The Bell System Technical Journal, vol. 50, No. 9, Nov. 1971, pp. 2879-2916.

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