Data processing: measuring – calibrating – or testing – Calibration or correction system – Circuit tuning
Reexamination Certificate
2005-08-16
2005-08-16
Bui, Bryan (Department: 2863)
Data processing: measuring, calibrating, or testing
Calibration or correction system
Circuit tuning
C702S085000, C702S106000, C375S329000
Reexamination Certificate
active
06931343
ABSTRACT:
An on-signal calibration system I and Q signals of a transmitter to remove distortions in the RF output signal. The transmitter generates I and Q values and converts, modulates and combines the I and Q values into the RF output signal for transmission. The calibration system includes a detector, a sampler, a selector, an imbalance estimator, and an IQ corrector. The detector senses the RF output signal and provides a detection signal indicative thereof. The sampler samples the detection signal and provides digital samples. The selector selects from among the digital samples that correspond to predetermined ranges of the I and Q values, or otherwise predetermined selection boxes at predetermined phases. The imbalance estimator determines at least one imbalance estimate based on selected digital samples. The IQ corrector corrects the I and Q values using at least one imbalance estimate.
REFERENCES:
patent: 5721754 (1998-02-01), Chen
patent: 6421339 (2002-07-01), Thomas
patent: 6778613 (2004-08-01), Avidor et al.
Cochran Bruce A.
Seals Michael J.
Webster Mark A.
Bui Bryan
Globespanvirata Incorporated
Hunton & Williams LLP
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