Linearization circuits and methods for multilevel power amplifier systems
First Claim
Patent Images
1. A system having an input and an RF output, the system comprising:
- one or more RF amplifiers each having an RF input, an RF output, and a power supply input;
a voltage control unit coupled to provide a power supply voltage to the power supply input of at least one of the one or more RF amplifiers wherein said voltage control unit dynamically selects the power supply voltage from among different inputs or levels based in part upon one or more signal characteristics of a signal to be transmitted; and
a linearization system coupled to each of the at least one RF amplifiers coupled to said voltage control unit, said linearization system for improving the linearity of the system in which the RF input to at least one of said one or more RF amplifier(s) is predistorted, and wherein the applied predistortion is indexed, at least in part, by the selection of power supply level.
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Abstract
Circuits and methods for achieving high linearity, high efficiency power amplifiers, including digital predistortion (DPD) and pulse cancellation in switched-state RF power amplifier systems are described.
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Citations
20 Claims
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1. A system having an input and an RF output, the system comprising:
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one or more RF amplifiers each having an RF input, an RF output, and a power supply input; a voltage control unit coupled to provide a power supply voltage to the power supply input of at least one of the one or more RF amplifiers wherein said voltage control unit dynamically selects the power supply voltage from among different inputs or levels based in part upon one or more signal characteristics of a signal to be transmitted; and a linearization system coupled to each of the at least one RF amplifiers coupled to said voltage control unit, said linearization system for improving the linearity of the system in which the RF input to at least one of said one or more RF amplifier(s) is predistorted, and wherein the applied predistortion is indexed, at least in part, by the selection of power supply level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power amplifier system having an input and an RF output, comprising:
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one or more power amplifier(s) each having an RF input, an RF output, and a power supply input, wherein the power supply voltage provided to said power supply input for at least one power amplifier is dynamically selected from among different inputs or levels based in part upon one or more signal characteristics of a signal to be transmitted; and wherein variations in an RF output signal at the RF output of the power amplifier system owing to changes in selection of a power supply input of at least one of said one or more power amplifiers are compensated by a compensation signal provided to the RF input of at least one of said one or more power amplifiers. - View Dependent Claims (12, 13, 14, 15)
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16. A power amplifier system having a data input and an RF output, comprising:
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one or more power amplifiers that are switched among a discrete set of operating states based at least in part upon data provided to the data input of the power amplifier system; a state-based digital pre-distortion (SB-DPD) system, coupled to at least one of the one or more power amplifiers, said SB-DPD system for improving linearity of the power amplifier system by predistortion of signals provided to one or more of said one or more power amplifiers, said predistortion depending at least in part upon an operating state of said one or more power amplifiers. - View Dependent Claims (17, 18, 19, 20)
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Specification