Quadrature error correction using polynominal models in tone calibration
AssigneeAnalog Devices, Inc.
InventorsWei An, Richard P. Schubert, Yosef Stein
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Abstract
One example embodiment provides a system, apparatus, and method for using polynomial models in tone calibration for quadrature error correction in I/Q receivers. In one example embodiment, method for calibrating an I/Q receiver is provided and includes receiving a first mismatch parameter indicating a mismatch between I and Q channels of the I/Q receiver; and estimating a second mismatch parameter from the first mismatch parameter using a polynomial model.
Claims20
A method for calibrating an I/Q receiver, comprising:
- receiving a first mismatch parameter indicating a mismatch between I and Q channels of the I/Q receiver;
- and
- estimating a second mismatch parameter from the first mismatch parameter using a polynomial model.
An apparatus for calibrating an I/Q receiver, the apparatus comprising:
- a polynomial estimator configured to:
- receive a first mismatch parameter, wherein the first mismatch parameter estimation indicates a mismatch between I and Q channels of the I/Q receiver;
- and
- estimate a second mismatch parameter from the first mismatch parameter estimation using a polynomial model.
An apparatus for calibrating an I/Q receiver, comprising:
- a tone calibration estimator configured to inject test tones at frequencies within a test spectrum into the I/Q receiver, estimate a first set of mismatch parameters comprising a total gain mismatch parameter and a total phase mismatch parameter, and output the first set of mismatch parameters.
- a polynomial calibration estimator coupled to the tone calibration estimator, the polynomial calibration estimator configured to receive the first set of mismatch parameters from the tone calibration estimator and estimate a second set of mismatch parameters from the first set of mismatch parameters using a polynomial model, the second set of mismatch parameters comprising a frequency-dependent gain mismatch parameter, a frequency-dependent phase mismatch parameter, and a frequency-independent phase mismatch parameter.
Dependencies are inferred from the claim text.