Method and apparatus of compensating imbalance of a modulator
First Claim
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1. An apparatus comprising:
- a modulator to generate a distorted modulated signal based on a pair of calibration signals;
a detector to detect an envelope of the distorted modulated signal to produce a detected envelope signal;
an in-phase/quadrature phase generator to send said pair of calibration signals over one of an in-phase branch and a quadrature branch of a calibration network; and
a processor to generate first and second sets of calibration parameters, wherein said processor is able to compensate an imbalance of the modulator and wherein the generation of the second set of calibration parameters results in a value of a spectral parameter of a second harmonic of said detected envelope signal being substantially equal to an electric power of the distorted modulated signal.
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Abstract
Briefly, a method and apparatus to compensate an imbalance of a modulator by providing calibration parameters to a calibration network. The modulator may receive a pair of predetermined sinusoidal in-phase and quadrature signals and output a distorted modulated signal. A processor may process spectral parameters at first and second harmonics of a detected envelope signal of the distorted modulated signal may generate the calibration parameters.
15 Citations
19 Claims
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1. An apparatus comprising:
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a modulator to generate a distorted modulated signal based on a pair of calibration signals; a detector to detect an envelope of the distorted modulated signal to produce a detected envelope signal; an in-phase/quadrature phase generator to send said pair of calibration signals over one of an in-phase branch and a quadrature branch of a calibration network; and a processor to generate first and second sets of calibration parameters, wherein said processor is able to compensate an imbalance of the modulator and wherein the generation of the second set of calibration parameters results in a value of a spectral parameter of a second harmonic of said detected envelope signal being substantially equal to an electric power of the distorted modulated signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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providing first and second sets of calibration parameters to a calibration network by modulating a pair of calibration signals and measuring spectral parameters at first and second harmonics of a detected envelope signal of the modulated calibration signals, wherein providing the second set of calibration parameters comprises; generating a set of calibration parameters that result in a value of a spectral parameter of a second harmonic of the detected envelope signal being substantially equal to an electric power of the modulated calibration signal when sending said pair of calibration signal over one of an in-phase branch and a quadrature branch of the calibration network. - View Dependent Claims (8, 9)
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10. A radio system comprising:
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a transmitter having; a modulator to generate a distorted modulated signal according to a pair of calibration signals; an in-phase/quadrature phase generator to send said pair of calibration signals over one of an in-phase branch and a quadrature branch of a calibration network; and a processor to generate first and second sets of calibration parameters able to compensate an imbalance of the modulator and wherein the generation of the second set of calibration parameters results in a value of a spectral parameter of a second harmonic of a detected envelope signal of the distorted modulated signal being substantially equal to an electric power of the distorted modulated signal; and a dipole antenna operably coupled to the transmitter to transmit a modulated signal compensated by the calibration parameters. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An article comprising:
- a storage medium, having stored thereon instructions, that when executed by a processor, result in;
providing first and second sets of calibration parameters to a calibration network by modulating a pair of predetermined sinusoidal signals and measuring spectral parameters at first and second harmonics of a detected envelope signal of a modulated signal, wherein providing the second set of calibration parameters comprises; generating the second set of calibration parameters such that a value of the spectral parameter of the second harmonic of the detected envelope signal is substantially equal to an electric power of the modulated signal when sending substantially the same calibration signal over one of an in-phase branch and a quadrature branch of the calibration network. - View Dependent Claims (18, 19)
- a storage medium, having stored thereon instructions, that when executed by a processor, result in;
Specification