Linearization Circuits And Methods For Multilevel Power Amplifier Systems
First Claim
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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 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 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.
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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.
57 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 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 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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, for improving linearity of the power amplifier system by digital predistortion of signals provided to the at least one power amplifier. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification