Power amplifier linearization feedback methods and systems
First Claim
1. A system for improving linearity of a power amplifier, comprising:
- a first input operable to couple to an input signal path of the power amplifier for obtaining a first sample of an input signal of the power amplifier;
a second input operable to couple to an output signal path of the power amplifier for obtaining a second sample of an output signal of the power amplifier, the output signal comprising at least one non-linearity component imposed on the output signal by the power amplifier, the second sample comprising at least one sampled non-linearity component corresponding to the at least one non-linearity component;
an output operable to couple to the input signal path of the power amplifier, the output for applying a linearity improving signal to the input signal path; and
a linearizer electrically coupled to the first input, the second input, and the output, the linearizer comprising;
a first signal canceller for receiving the first sample from the first input and the second sample from the second input and deducting the first sample from the second sample to produce an intermediate signal comprising the at least one sampled non-linearity component; and
a second signal canceller coupled between the first signal canceller and the output, the second signal canceller operable to produce the linearity improving signal by adjusting at least one of amplitude, phase, and delay of the at least one sampled non-linearity component of the intermediate signal, the linearity improving signal operable to reduce an intensity of the at least one non-linearity component in response to being coupled to the input signal path and amplified by the power amplifier.
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Abstract
Linearizers can improve the linearity of power amplifiers by canceling or reducing amplitude of non-linearity components, (e.g., IM3, IM5, IM7, IM9, etc.) generated by the power amplifier. The linearizers can obtain samples of signals output by the power amplifier and process the samples to produce a compensation signal that is applied onto or into a transmission path leading to the power amplifier'"'"'s input. The compensation signal is generated such that when amplified by the power amplifier, the amplified compensation signal cancels or reduces at least a portion of the non-linearity components produced by the power amplifier. A controller can improve the correction of the non-linearity components by executing one or more calibration algorithms and/or one or more tuning algorithms and adjusting settings of the linearizer based on the results of the algorithm(s).
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Citations
25 Claims
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1. A system for improving linearity of a power amplifier, comprising:
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a first input operable to couple to an input signal path of the power amplifier for obtaining a first sample of an input signal of the power amplifier; a second input operable to couple to an output signal path of the power amplifier for obtaining a second sample of an output signal of the power amplifier, the output signal comprising at least one non-linearity component imposed on the output signal by the power amplifier, the second sample comprising at least one sampled non-linearity component corresponding to the at least one non-linearity component; an output operable to couple to the input signal path of the power amplifier, the output for applying a linearity improving signal to the input signal path; and a linearizer electrically coupled to the first input, the second input, and the output, the linearizer comprising; a first signal canceller for receiving the first sample from the first input and the second sample from the second input and deducting the first sample from the second sample to produce an intermediate signal comprising the at least one sampled non-linearity component; and a second signal canceller coupled between the first signal canceller and the output, the second signal canceller operable to produce the linearity improving signal by adjusting at least one of amplitude, phase, and delay of the at least one sampled non-linearity component of the intermediate signal, the linearity improving signal operable to reduce an intensity of the at least one non-linearity component in response to being coupled to the input signal path and amplified by the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for reducing non-linearity components imposed on a signal output by a power amplifier, the method comprising:
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receiving a second sample of an output signal output by the power amplifier, the output signal comprising at least one non-linearity component imposed on the output signal by the power amplifier, the first sample comprising at least one sampled non-linearity component corresponding to the at least one non-linearity component; determining an intensity level of the at least one sampled non-linearity component; generating a compensation signal by adjusting at least one of phase, amplitude, and delay of the at least one sampled non-linearity component based on the intensity level; applying the compensation signal to an input of the power amplifier; and in response to applying the compensation signal to the input, reducing amplitude of the at least one non-linearity component. - View Dependent Claims (15, 16, 17, 18)
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19. A method for reducing non-linearity components of an output signal of a power amplifier, the method comprising:
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(a) obtaining a first sample of an input signal from an input signal path to the power amplifier, the first sample comprising a first modulated signal component; (b) obtaining a second sample of an output signal of the power amplifier, the output signal comprising at least one non-linearity component imposed on the output signal by the power amplifier, the second sample comprising a second modulated signal component and at least one sampled non-linearity component; (c) generating an intermediate signal by reducing amplitude of the second modulated signal component of the second sample by deducting the first sample from the second sample; (d) determining an intensity level of the at least one sampled non-linearity component; (e) producing a compensation signal by adjusting at least one of phase, amplitude, and delay of the at least one sampled non-linearity component based on the intensity level; (f) applying the compensation signal to the input signal path; and (g) in response to applying the compensation signal to the input signal path and to the power amplifier amplifying the compensation signal, reducing an intensity level of the at least one non-linearity component. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification