Error Driven RF Power Amplifier Control with Increased Efficiency
First Claim
1. A radio frequency (RF) power amplifier system, comprising:
- a power amplifier coupled to receive and amplify an RF input signal to generate an RF output signal; and
a power amplifier controller coupled to the power amplifier for controlling a supply voltage to the power amplifier,the supply voltage adjusted based on a difference between a deviation signal and a distortion level control signal,the deviation signal based on an error signal representing a difference between the RF input signal and the RF output signal, andthe distortion level control signal corresponding to an allowable distortion level in the RF output signal.
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Abstract
A power amplifier controller for adjusting a supply voltage to a power amplifier. The power amplifier controller adjusts the supply voltage so that distortion in an RF output signal corresponds to a predetermined limit. An amplitude error signal is generated by the power amplifier controller which represents a difference between an RF output signal and an attenuated RF output signal. The AC components of the amplitude error signal are processed to generate a deviation signal that represents the distortion in the RF output signal. The supply voltage to the power amplifier is increased when the deviation signal exceeds a distortion level control signal, and decreased when the deviation signal drops below the distortion level control signal.
109 Citations
33 Claims
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1. A radio frequency (RF) power amplifier system, comprising:
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a power amplifier coupled to receive and amplify an RF input signal to generate an RF output signal; and a power amplifier controller coupled to the power amplifier for controlling a supply voltage to the power amplifier, the supply voltage adjusted based on a difference between a deviation signal and a distortion level control signal, the deviation signal based on an error signal representing a difference between the RF input signal and the RF output signal, and the distortion level control signal corresponding to an allowable distortion level in the RF output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radio frequency (RF) power amplifier system, comprising:
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a power amplifier coupled to receive and amplify an RF input signal to generate an RF output signal; a variable gain amplifier (VGA) coupled to the power amplifier for adjusting the RF input signal based upon a gain control signal, the gain control signal adjusting the gain of the VGA in order to maintain constant difference between the RF output signal and the RF input signal; a power amplifier controller coupled to the power amplifier for controlling a supply voltage to the power amplifier; and the supply voltage adjusted based on a difference between a deviation signal and a distortion level control signal, the deviation signal based on a time-varying change of gain of the VGA, the distortion level control signal corresponding to an allowable distortion level in the RF output signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of amplifying an RF input signal using a power amplifier, comprising:
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amplifying the RF input signal by the power amplifier to generate an RF output signal; generating an error signal based on a difference between the RF input signal and a RF output signal; generating a supply voltage control signal based on a difference between a deviation signal and a distortion level control signal, the deviation signal based on a measured level of activity of the error signal; and adjusting a supply voltage to the power amplifier based on the supply voltage control signal. - View Dependent Claims (28, 29, 30)
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31. A method of amplifying an RF input signal using a power amplifier, comprising:
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amplifying the RF input signal by the power amplifier to generate an RF output signal; adjusting the RF input signal by a variable gain amplifier (VGA) based on a gain control signal to maintain constant a difference between the RF output signal and the RF input signal; generating an error signal based on a difference between the RF input signal and a RF output signal; and adjusting a supply voltage to the power amplifier based on a difference between a deviation signal and a distortion level control signal, the distortion level control signal corresponding to an allowable distortion level in the RF output signal. - View Dependent Claims (32, 33)
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Specification