Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter
First Claim
1. A predistorer configured for use with an RF power amplifier, the predistorter comprising:
- an input loop configured to be coupled to the input of an RF power amplifier, the input loop including a look-up table containing predistortion values, the input loop configured to apply the predistortion values to an input signal, in response to a monotonically increasing function of the input signal power, for forming a predistorted input signal; and
a peak control circuit coupled to the input loop, the peak control circuit configured to select a power supply voltage for the RF power amplifier in response to the power in the input signal.
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Abstract
A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop includes a look-up table containing predistortion values to be applied to an input signal, in response to the power in the input signal, for forming a predistorted input signal. The predistorter may further include an output loop, such an output loop configured to measure an intermodulation distortion product of the RF power amplifier output resulting from the predistorted input signal, and operable to update the predistortion values in the look-up table. Such a peak control circuit configured to select a power supply voltage for the RF power amplifier in response to the power in the input signal.
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Citations
42 Claims
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1. A predistorer configured for use with an RF power amplifier, the predistorter comprising:
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an input loop configured to be coupled to the input of an RF power amplifier, the input loop including a look-up table containing predistortion values, the input loop configured to apply the predistortion values to an input signal, in response to a monotonically increasing function of the input signal power, for forming a predistorted input signal; and
a peak control circuit coupled to the input loop, the peak control circuit configured to select a power supply voltage for the RF power amplifier in response to the power in the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An amplifier system comprising an RF power amplifier and a predistorter, the predistorter comprising:
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an input loop configured to be coupled to the input of an RF power amplifier, the input loop including a look-up table containing predistortion values, the input loop configured to apply the predistortion values to an input signal, in response to a monotonically increasing function of the input signal power, for forming a predistorted input signal; and
a peak control circuit coupled to the input loop, the peak control circuit configured to select a power supply voltage for the RF power amplifier in response to the power in the input signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of predistorting an input signal applied to an RF power amplifier, the method comprising:
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producing a scalar value representative of the power of the input signal;
applying the scalar value to index a look-up table containing predistortion values;
combining the predistortion values with the input signal to improve the linearity of the RF power amplifier; and
applying the scalar to a threshold to select a power supply voltage for the RF power amplifier. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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Specification