Circuit for compensating for nonlinear distortion in transmit po

Details Circuit for compensating for nonlinear distortion in transmit po Circuit for compensating for nonlinear distortion in transmit po

1994-03-30

1995-03-07

Mullins, James B.

Amplifiers

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

332103, 325296, 455 63, 327317, H03F 126

Patent

active

053961900

ABSTRACT:
A distortion compensating unit is provided which can reduce the time required to converge distortion compensation values into a given value and operate with an improved stability after said convergence. Constants of multipliers in a correcting factor generating circuit are switched from one to another, depending on the time from the start of operation of a distortion compensating circuit or the temperature in a power amplifier. A constant to be switched is selected to be larger than that of the prior art until the convergence is completed and to be smaller than that of the prior art after the convergence has been completed. Thus, the time required to converge the corrected value into a given value can be reduced to less than that of the prior art. In addition, the distortion compensating unit can operate with an improved stability after the convergence.

REFERENCES:
patent: 4700151 (1987-10-01), Nagata

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