I/Q calibration

Details I/Q calibration I/Q calibration

2007-02-20

2007-02-20

Gelin, Jean (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S067110, C455S067140, C455S067160

Reexamination Certificate

active

10943055

ABSTRACT:
The amplitude and phase errors of the modulation and demodulation in a transceiver are corrected by a self-calibration procedure in which a test signal is applied to the baseband input of the transmitter, and the output of the modulator is looped back to the input of the demodulator. The amplitude and phase errors of the resulting signal at the baseband output of the receiver are detected, and the contributions of the transmitter and receiver to the errors are separated and resolved into amplitude and phase components. Adjustments are then made to the amplitude and phase balance in the transmit and receive signal paths to correct the errors.

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