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 RE 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 RE amplifiers wherein the voltage control unit dynamically selects the power supply voltage from among a discrete set of operating states based in part upon one or more signal characteristics of a signal to be amplified; and
a linearization unit comprising a digital pre-distortion (DPD) unit coupled to at least one of the one ore more RF amplifiers for improving linearity of the system by digital predistortion of signals provided to the one or more RE amplifiers.
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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.
133 Citations
24 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 RE 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 RE amplifiers wherein the voltage control unit dynamically selects the power supply voltage from among a discrete set of operating states based in part upon one or more signal characteristics of a signal to be amplified; and a linearization unit comprising a digital pre-distortion (DPD) unit coupled to at least one of the one ore more RF amplifiers for improving linearity of the system by digital predistortion of signals provided to the one or more RE amplifiers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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; and A digital pre-distortion (DPD) system, coupled to at least one of the one or more power amplifiers, configured to adjust a time alignment between the switching of one or more power amplifiers among operating states and the application of a predistorted RF input signal to the at least one power amplifier based, at least in part, upon a sensed RF output signal of the power amplifier system. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system having an input and an RP 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 the 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 amplified; a linearization unit to improve the linearity of the system by predistorting the RF input to at least one of the one or more RF amplifiers; and a first power amplifier and a second power amplifier, wherein disturbances in the RF output of the system owing to changes in the power supply input selection of the first power amplifier are compensated by a signal introduced via the RF input of the second power amplifier.
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24. 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 the 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 amplified; and a digital pre-distortion (DPD) unit, coupled to at least one of the one or more RF amplifiers, configured to adjust a time alignment between the switching of one or more RF amplifiers among operating states and the application of a predistorted RF input signal to the one or more RF amplifiers based, at least in part, upon a sensed RF output signal of the system.
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Specification