An auto-I/Q calibrated CMOS transceiver for 802.11g

An IQ mismatch calibration and compensation technique based on the digital baseband for wideband wireless communication transmitters is proposed. The digital baseband transmits the signal used for IQ mismatch calibration. The signal passes through the RF transmitter path, the calibration loop (which is composed of a square power detector and a band-pass filter in the RF transceiver) and the variable gain amplifier of the receiver. The digital baseband samples the signal for IQ mismatch estimation and compensates for it. Compared with the self-calibration technique in the RF chip, the proposed technique saves area and power consumption for the wireless local area network solution. This technique has been successfully used for the 802.11n system and satisfies the requirement of the standard by achieving over 50 dB image suppression.

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“…The calibration circuits of Ref. [8] occupy about 0.5 mm 2 and the I/Q phase error is 1 degree after calibration.…”

Section: Implementation and Measurement Resultsmentioning

confidence: 99%

An IQ mismatch calibration and compensation technique for wideband wireless transceivers

et al. 2014

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Energy efficient M2M communications for aerospace monitoring applications

Perget

Dragomirescu

2013

2013 IEEE International Conference on Communications Workshops (ICC)

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