High efficiency linearization power amplifier for wireless communication
First Claim
1. A predistortion system for linearizing an output of a power amplifier, the predistortion system comprising:
- a first input operable to receive an analog RF modulated signal;
a second input operable to receive a feedback signal representative of nonlinear characteristics of a power amplifier;
a predistortion controller, comprising at least one lookup table, adapted to receive a digitized version of the analog RF modulated signal and a digitized version of the feedback signal and to generate a correction factor for correcting the nonlinear characteristics of the power amplifier;
combining logic which combines the analog RF modulated signal with a signal corresponding to the correction factor and supplies it to the power amplifier to linearize the output of the power amplifier;
a first A-to-D converter coupled to the analog RF modulated signal and operable to generate a first quadrature signal; and
a second A-to-D converter coupled to the feedback signal and operable to generate a second quadrature signal, wherein the correction factor is equal to the square of the first quadrature signal minus the square of the second quadrature signal.
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Abstract
A predistortion system for linearizing the output of a power amplifier includes a first signal representative of an RF modulated signal and a feedback signal representative of nonlinear characteristics of a power amplifier. The system also includes a predistortion controller, comprising at least one lookup table, adapted to receive the first signal and the feedback signal and to generate a correction factor for correcting the nonlinear characteristics of the power amplifier and combining logic which combines the RF modulated signal with a signal corresponding to the correction factor and supplies it to the power amplifier to linearize the output of the power amplifier.
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Citations
16 Claims
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1. A predistortion system for linearizing an output of a power amplifier, the predistortion system comprising:
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a first input operable to receive an analog RF modulated signal; a second input operable to receive a feedback signal representative of nonlinear characteristics of a power amplifier; a predistortion controller, comprising at least one lookup table, adapted to receive a digitized version of the analog RF modulated signal and a digitized version of the feedback signal and to generate a correction factor for correcting the nonlinear characteristics of the power amplifier; combining logic which combines the analog RF modulated signal with a signal corresponding to the correction factor and supplies it to the power amplifier to linearize the output of the power amplifier; a first A-to-D converter coupled to the analog RF modulated signal and operable to generate a first quadrature signal; and a second A-to-D converter coupled to the feedback signal and operable to generate a second quadrature signal, wherein the correction factor is equal to the square of the first quadrature signal minus the square of the second quadrature signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for linearizing an output of a power amplifier, the method comprising:
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receiving an analog RF modulated signal at an input of a predistortion controller; receiving a feedback signal representative of nonlinear characteristics of the power amplifier; generating a correction factor associated with the nonlinear characteristics of the power amplifier; combining the analog RF modulated signal with the correction factor to provide a power amplifier input signal; receiving the power amplifier input signal at an input of the power amplifier; generating a first quadrature signal using a first A-to-D converter coupled to the digitized version of the RF modulated signal; and generating a second quadrature signal using a second A-to-D converter coupled to the feedback signal, wherein the correction factor is equal to the square of the first quadrature signal minus the square of the second quadrature signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification