I/Q calibration techniques
First Claim
Patent Images
1. A receiver comprising:
- a local oscillator;
a first frequency conversion module responsive to the local oscillator and a received signal to generate an in-phase I signal;
a second frequency conversion module responsive to the local oscillator and the received signal to generate a quadrature Q signal;
a first filter responsive to the first frequency conversion module and adapted to generate a first output signal having first and second portions of a frequency spectrum;
a second filter responsive to the second frequency conversion module and adapted to generate a second output signal having the first and second portions of the frequency spectrum;
a third filter responsive to the first filter;
a fourth filter responsive to the second filter;
a calibration block responsive to outputs of the third and fourth filters and adapted to detect mismatches associated with the first portion of the frequency spectrum; and
a correlator/integrator responsive to the calibration block and adapted to generate a first feedback signal applied to the third filter and a second feedback signal applied to the fourth filter, said first and second feedback signals being operative to vary frequency characteristics of the third and fourth filters so as to compensate for mismatches associated with the second portion of the frequency spectrum in the first and second filters.
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Abstract
A receiver includes a static I/Q calibration block and a correlation/integration block. The static I/Q calibration block is configured to substantially eliminate mismatches between in-phase and quadrature components of a portion of the spectrum having associated I/Q mismatches that are relatively frequency-independent. The correlation/integration block is configured to substantially eliminate mismatches between the in-phase and quadrature components of portions of the spectrum having associated I/Q mismatches that are relatively frequency-dependent in accordance with a pair of signals generated by the static I/C calibration block.
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Citations
11 Claims
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1. A receiver comprising:
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a local oscillator; a first frequency conversion module responsive to the local oscillator and a received signal to generate an in-phase I signal; a second frequency conversion module responsive to the local oscillator and the received signal to generate a quadrature Q signal; a first filter responsive to the first frequency conversion module and adapted to generate a first output signal having first and second portions of a frequency spectrum; a second filter responsive to the second frequency conversion module and adapted to generate a second output signal having the first and second portions of the frequency spectrum; a third filter responsive to the first filter; a fourth filter responsive to the second filter; a calibration block responsive to outputs of the third and fourth filters and adapted to detect mismatches associated with the first portion of the frequency spectrum; and a correlator/integrator responsive to the calibration block and adapted to generate a first feedback signal applied to the third filter and a second feedback signal applied to the fourth filter, said first and second feedback signals being operative to vary frequency characteristics of the third and fourth filters so as to compensate for mismatches associated with the second portion of the frequency spectrum in the first and second filters. - View Dependent Claims (2, 3, 4, 5)
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6. A method for performing calibration in a receiver, the method comprising:
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frequency converting a received RF signal to a first in-phase signal and a first quadrature signal; filtering the first in-phase signal in an in-phase signal path to generate a second in-phase signal; filtering the first quadrature signal in a quadrature signal path to generate a second quadrature phase signal; performing a first digital filtering operation in response to the second in-phase signal and further in response to a first feedback signal to generate a third in-phase signal; performing a second digital filtering operation in response to the second quadrature signal and a second feedback signal to generate a third quadrature signal; detecting mismatches in a first portion of a frequency spectrum of the third in-phase and quadrature signals to generate a first output signal and a second output signal; and generating the first feedback signal and the second feedback signal in response to the first and second output signals, the first and second feedback signals compensating for mismatches in a second portion frequency portion in the in-phase and quadrature signal paths. - View Dependent Claims (7, 8)
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9. A method for processing a received signal over wireless communication receiver, the method comprising:
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detecting mismatches between in-phase and quadrature components of a first portion of a frequency spectrum of the received signal; and removing mismatches between the in-phase and quadrature components of a second portion of the frequency spectrum in response to the detected mismatches; wherein removing the mismatches of the second portion of the frequency spectrum comprises; adjusting a first transfer function of at least one of the in-phase components in a first direction and adjusting a second transfer function of at least one of the quadrature components in a second direction opposite of the first direction. - View Dependent Claims (10, 11)
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Specification