Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1982-01-05
1984-08-21
Mullins, James B.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330271, 330 99, H03F 126, H03F 134
Patent
active
044672888
ABSTRACT:
A distortion-free amplifier in accordance with the present invention includes an input amplifier, an output amplifier and method, and a cooperative combination of negative and positive feedback loops that remove substantially all distortion and error in the amplified output. Negative feedback loops are provided around the output amplifier and the input/output amplifier combination to provide degenerative error reduction. The negative feedback loop around the output stage provides a portion of the output to a voltage node at which the error component of the output signal is inversely superposed on the inverted signal to be amplified. This highly "visible" (inverse, intra-loop) error component is utilized as positive feedback to provide a regeneratively enhanced error pre-correction of the signal in the input amplifier. The pre-correction can be precisely controlled to effect virtually complete serial cancellation of the to-be-introduced error as the signal is propagated through the amplifier.
REFERENCES:
patent: 3469202 (1969-09-01), Priddy
patent: 4125813 (1978-11-01), Cubbison, Jr.
Mullins James B.
Wan G.
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