Power amplifier having predistortion linearizer
First Claim
1. A power amplifier, comprising:
- a predistorter configured to receive an input signal and output a distortion compensating signal;
a power amplifier coupled to receive the distortion compensating signal and generate an output signal;
a delay line coupled to receive the input signal and generate a reference signal;
a distortion component detector coupled to receive the output signal and the reference signal, and detect a distortion component of the output signal to generate a distortion level output signal; and
an adaptive controller coupled to receive the distortion level output signal and generate a control signal to control the predistorter.
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Accused Products
Abstract
A power amplifier having a predistortion linearizer for improving the non-linear property of the power amplifier is disclosed. The powers amplifier includes a predistorter for outputting a distortion compensating signal to the high power amplifier, a delay line for delaying an input signal for a prescribed period of time and outputting a reference signal, a distortion component detection circuit for detecting a distortion component by comparing the output signal of the power amplifier with the reference signal of the delay line, and an adaptive controller for controlling the properties of the predistorter in order to minimize the detected distortion component.
71 Citations
24 Claims
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1. A power amplifier, comprising:
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a predistorter configured to receive an input signal and output a distortion compensating signal;
a power amplifier coupled to receive the distortion compensating signal and generate an output signal;
a delay line coupled to receive the input signal and generate a reference signal;
a distortion component detector coupled to receive the output signal and the reference signal, and detect a distortion component of the output signal to generate a distortion level output signal; and
an adaptive controller coupled to receive the distortion level output signal and generate a control signal to control the predistorter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A distortion component detector for a power amplifier, comprising:
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a delay line coupled to delay an input signal for a prescribed period of time to generate a reference signal;
a vector modulator coupled to receive an output signal of a power amplifier and control a gain and phase of the output signal; and
a distortion component detection circuit coupled to receive an output of the vector modulator and detect a distortion component of the output signal by computing vector components of the output signal and the reference signal, and outputting a control voltage corresponding to a difference in gain and phase between the reference signal and the output signal to the vector modulator. - View Dependent Claims (11, 12, 13, 14)
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15. A distortion component detection circuit for a power amplifier, comprising:
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a delay line to delay an input signal for a prescribed time period and generate a reference signal;
a vector modulator to control a gain and phase of an output signal of the power amplifier;
a branch line coupler to receive the output signal and the reference signal and add vector components of both signals;
a 2-way combiner to combine outputs of the branch line coupler and output a distortion component; and
a control signal generator to calculate a difference in gain and phase of the output signal and reference signal by receiving the output signal, the reference signal, the output signal of the branch line coupler, and a power signal of the distortion component and outputting a control voltage proportional to the calculated difference. - View Dependent Claims (16, 17)
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18. A method of adaptively controlling the linearity of a power amplifier, comprising:
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generating a reference signal by phase shifting an input signal;
identifying a distortion component of an output signal of the power amplifier by combining the reference signal and the output signal;
generating a control signal based on the identified level of the distortion component;
controlling the non-linear effects of the power amplifier using the control signal.
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20. A method of separating a distortion component from an amplified signal, comprising:
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generating an output signal by amplifying an input signal;
generating a reference signal by delaying the input signal, wherein the reference signal is 180 degrees phase shifted from the input signal;
adjusting the output signal to have the same amplitude as the reference signal; and
combining the output signal with the reference signal to generate a distortion component signal. - View Dependent Claims (19, 21, 22, 23, 24)
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Specification