Nonlinear distortion compensation power amplifier
First Claim
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1. A nonlinear distortion compensating power amplifier comprising:
- a power amplifier;
a distortion signal generation circuit being placed on the input side of the power amplifier, and to generate a distortion signal according to an input signal to cancel out a nonlinear distortion of the power amplifier; and
a gain adjustment circuit to adjust an overall gain so that the overall gain is constant, wherein the distortion signal generated by the distortion signal generation circuit according to the input signal is determined on a basis of an algorithm which minimizes a power of unnecessary out-of-band signal components in an output signal from the power amplifier.
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Abstract
A nonlinear distortion compensating power amplifier is provided with a gain adjustment circuit and performs gain adjustment control so that the overall gain of the entire system including a power amplifier is always maintained at a constant value. While this gain adjustment is being performed, a control circuit determines an optimum distortion amount pattern corresponding to instantaneous values of an input signal supplied to a distortion signal generation circuit to enable this circuit to generate a distortion signal such that the power of unnecessary out-of-band signal components in an output signal from the power amplifier is minimized.
24 Citations
15 Claims
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1. A nonlinear distortion compensating power amplifier comprising:
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a power amplifier;
a distortion signal generation circuit being placed on the input side of the power amplifier, and to generate a distortion signal according to an input signal to cancel out a nonlinear distortion of the power amplifier; and
a gain adjustment circuit to adjust an overall gain so that the overall gain is constant, wherein the distortion signal generated by the distortion signal generation circuit according to the input signal is determined on a basis of an algorithm which minimizes a power of unnecessary out-of-band signal components in an output signal from the power amplifier. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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2. A nonlinear distortion compensating power amplifier comprising:
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a power amplifier;
a distortion signal generation circuit being placed on the input side of the power amplifier, and to generate a distortion signal according to an input signal to cancel out a nonlinear distortion of the power amplifier;
a gain adjustment circuit to adjust an overall gain so that the overall gain is constant;
an input power measurement circuit to measure an input signal power; and
an output power measurement circuit to measure an in-band signal power and an out-of-band signal power in an output signal. - View Dependent Claims (3, 4, 11, 12, 13, 14, 15)
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Specification