Method and apparatus utilizing a compensated multiple output signal source
First Claim
1. A method utilizing a signal source having a plurality of signal outputs coupled to particular circuit and provide inputs thereto, the particular circuit having an output, the method comprising the steps of:
- applying a training configuration to the signal source to highlight imperfections within the signal source and within the particular circuit;
measuring parameters, during application of the training configuration, to develop an error model representing the imperfections in the signal source and in the particular circuit, wherein at least some of the parameters are measured at the plurality of signal outputs, and wherein at least one of the parameters is measured at the output of the particular circuit; and
applying compensation to the signal source based on the parameters, which compensation affects the plurality of signal outputs and compensates for the imperfections in the signal source and in the particular circuit;
wherein;
the imperfections are related to amplitude and phase imbalance among at least two of the plurality of signal outputs; and
the step of measuring parameters further comprises the step of measuring power level at the plurality of signal outputs from the signal source, and at the output of the particular circuit, to determine the parameters.
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Accused Products
Abstract
A compensated signal source (210, 220) utilizes baseband signals and a radio frequency carrier signal to generate a set of source output signals (226, 227) which are coupled to a particular circuit (230, 240, 250). The signal source (210, 220) is operable in a characterizing mode in which a test configuration is applied, and outputs from the signal source and the particular circuit measured to develop parameters representing imperfections within the signal source and within the particular circuit. The signal source (210, 220) is operable in a normal mode, in which compensation based on the measured parameters is applied to account for the imperfections. In a preferred embodiment, the particular circuit (230, 240, 250) and compensated signal source (210, 220) form part of an amplifier (200) that implements linear amplification using nonlinear components (LINC) techniques.
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Citations
25 Claims
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1. A method utilizing a signal source having a plurality of signal outputs coupled to particular circuit and provide inputs thereto, the particular circuit having an output, the method comprising the steps of:
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applying a training configuration to the signal source to highlight imperfections within the signal source and within the particular circuit; measuring parameters, during application of the training configuration, to develop an error model representing the imperfections in the signal source and in the particular circuit, wherein at least some of the parameters are measured at the plurality of signal outputs, and wherein at least one of the parameters is measured at the output of the particular circuit; and applying compensation to the signal source based on the parameters, which compensation affects the plurality of signal outputs and compensates for the imperfections in the signal source and in the particular circuit; wherein; the imperfections are related to amplitude and phase imbalance among at least two of the plurality of signal outputs; and the step of measuring parameters further comprises the step of measuring power level at the plurality of signal outputs from the signal source, and at the output of the particular circuit, to determine the parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising the steps of:
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generating a plurality of radio frequency (RF) signals from a signal source by modulating a RF carrier signal with baseband signals; coupling the plurality of RF signals to a particular circuit to generate an output; alternatively operating the signal source in a characterizing mode and in a normal mode; when in the characterizing mode; characterizing imperfections within the particular circuit and within the signal source through manipulation of the baseband signals according to a predefined configuration; measuring the plurality of radio frequency (RF) signals and the output of the particular circuit to develop parameters representing the imperfections within the particular circuit; and when in the normal mode, manipulating the baseband signals based on information derived from the parameters to compensate for the imperfections within the particular circuit. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An apparatus operable in a characterizing mode and in a normal mode, comprising:
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a signal source having as inputs a plurality of baseband signals and a radio frequency (RF) carrier signal, and having as outputs first and second source signals derived from a combination of the plurality of baseband signals and the RF carrier signal; a particular circuit having as inputs the first and second source signals and having an output signal; wherein when operating in the characterizing mode, the apparatus; characterizes imperfections within the particular circuit and within the signal source through manipulation of the plurality of baseband signals according to a predefined configuration; and measures the first and second source signals and the output signal to develop parameters representing the imperfections within the particular circuit; and wherein when operating in the normal mode, the apparatus manipulates the plurality of baseband signals based on information derived from the parameters to compensate for the imperfections within the particular circuit. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A linear amplification with non-linear components (LINC) amplifier responsive to an input information signal to output an amplified version of the input information signal, comprising:
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a constant envelope signal generation circuit responsive to a plurality of baseband signals and a radio frequency (RF) carrier signal to provide as output first and second source signals, the constant envelope signal generation circuit being alternatively operable in a characterizing mode and in a normal mode; a first amplification circuit coupled to the first source signal and responsive thereto to provide as output a first amplified signal; a second amplification circuit coupled to the second source signal and responsive thereto to provide as output a second amplified signal; a combining circuit coupled to the first and second amplified signals and responsive thereto to provide an output of the amplified version of the input information signal; a first power detector coupled to the first source signal; a second power detector coupled to the second source signal; and a third power detector coupled to the output of the combining circuit; wherein when operating in the characterizing mode, the constant envelope signal generation circuit; characterizes imperfections within the first and second amplification circuits through manipulation of the plurality of baseband signals according to a predefined configuration; and measures the first and second source signals and the output of the combining circuit using the first, second, and third power detectors to develop parameters representing the imperfections within the first and second amplification circuits; and wherein when operating in the normal mode, the constant envelope signal generation circuit manipulates the plurality of baseband signals based on information derived from the parameters to compensate for the imperfections within the first and second amplification circuits. - View Dependent Claims (23)
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24. A radio, comprising:
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communication circuitry; and a transmitter coupled to the communication circuitry, the transmitter including a LINC amplifier comprising; a signal source having as inputs a plurality of baseband signals and a radio frequency (RF) carrier signal, and having as outputs first and second source signals derived from a combination of the plurality of baseband signals and the RF carrier signal; amplification circuitry having as inputs the first and second source signals and having an output signal; wherein the LINC amplifier is operable in a first mode to; characterize imperfections within the amplification circuitry and within the signal source through manipulation of the plurality of baseband signals according to a predefined configuration; and measure the first and second source signals and the output signal to develop parameters representing the imperfections within the amplification circuitry; and wherein the LINC amplifier is operable in a second mode to manipulate the plurality of baseband signals based on information derived from the parameters to compensate for the imperfections within the amplification circuitry. - View Dependent Claims (25)
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Specification