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 a first input signal representative of an analog RF modulated signal;
a second input operable to receive a second input signal representative of an idealized reference signal;
a raw feedback path operable to receive a raw feedback signal representative of nonlinear characteristics of a power amplifier;
a first down converter coupled to the second input and operable to produce a biased reference signal;
a first analog-to-digital converter coupled to the first down converter and operable to produce a digitized reference signal;
a second down converter coupled to the raw feedback path and operable to produce a biased feedback signal;
a second analog-to-digital converter coupled to the second down converter and operable to produce a digitized feedback signal;
a predistortion controller, comprising at least one lookup table, operable to receive the digitized reference signal and the digitized feedback signal and to generate a predistortion correction signal; and
combining logic operable to combine the first signal and the predistortion correction signal and operable to produce a predistortion signal that is supplied to the power amplifier to linearize the output of the power amplifier.
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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
20 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 a first input signal representative of an analog RF modulated signal; a second input operable to receive a second input signal representative of an idealized reference signal; a raw feedback path operable to receive a raw feedback signal representative of nonlinear characteristics of a power amplifier; a first down converter coupled to the second input and operable to produce a biased reference signal; a first analog-to-digital converter coupled to the first down converter and operable to produce a digitized reference signal; a second down converter coupled to the raw feedback path and operable to produce a biased feedback signal; a second analog-to-digital converter coupled to the second down converter and operable to produce a digitized feedback signal; a predistortion controller, comprising at least one lookup table, operable to receive the digitized reference signal and the digitized feedback signal and to generate a predistortion correction signal; and combining logic operable to combine the first signal and the predistortion correction signal and operable to produce a predistortion signal that is supplied to the power amplifier to linearize the output of the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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 system; receiving an idealized reference signal at an input of the predistortion system; receiving a raw feedback signal representative of nonlinear characteristics of a power amplifier; generating a biased reference signal from the idealized reference signal; generating a digitized reference signal from the biased reference signal; generating a biased feedback signal from the raw feedback signal; generating a digitized feedback signal from the biased feedback signal; generating a predistortion correction signal from the digitized reference signal and the digitized feedback signal; combining the analog RF modulated signal with the predistortion correction signal to provide a predistortion signal; and receiving the predistortion signal at an input of the power amplifier. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification