Apparatus with reduced A/D dynamic range requirement in a compen

Details Apparatus with reduced A/D dynamic range requirement in a compen Apparatus with reduced A/D dynamic range requirement in a compen

1997-06-30

1999-06-29

Mottola, Steven J.

Amplifiers

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

375296, H03F 126

Patent

active

059173734

ABSTRACT:
An apparatus for compensating signal distortion via use of a feedback path, with reduced analog to digital conversion capacity requirements. In one embodiment, the apparatus is part of a transmission system which has an analog amplifier that distorts an information signal. Prior to the amplification, the information signal is provided in a digital format, processed digitally, and converted to analog for input to the amplifier. A sample signal is coupled off of output of the amplifier and applied along the feedback path. An analog-to-digital converter is located along the feedback path. A pre-distortion corrector is at the end of the feedback path. The pre-distortion corrector operates upon the source information using feedback data indicative of the amplifier distortion. Specifically, the information signal is pre-distorted (prior to input to the amplifier) to compensate for the distortion of the amplifier. A summation device is located along the feedback path, upstream of the analog-to-digital converter, to remove a source-based portion from the sample signal and for providing the sample signal containing only the amplifier distortion portion to the converter for conversion to digital.

REFERENCES:
patent: 4985688 (1991-01-01), Nagata
patent: 5093637 (1992-03-01), Isota et al.
patent: 5339054 (1994-08-01), Taguchi
patent: 5404378 (1995-04-01), Kimura
patent: 5486789 (1996-01-01), Palandech et al.

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