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In the market of wireless communication, high data-rate transmission and high spectral efficiency have been the trend. The IEEE 802.11 a/g standards working at 5GHz/2.4GHz ISM bands can support data rate up to 54Mbits/s using OFDM modulation. The newly proposed 802.11n technology now uses 64-QAM to achieve higher spectral efficiency. The DVB and many other systems will also use QAM for its data transmission. The cost of achieving this higher spectral efficiency using higher order QAM is that the transmitter and receiver requires a higher signal to noise ratio (SNR) with the same level of error rate performance (relative to a baseline BPSK, QPSK and other systems). One of the dominant vectors on SNR degradation is I/Q image rejection (I/Q gains and phases imbalance). There are a lot of factors that degrade the matching of gains and phases between I/Q signals: the instinct layout mismatch, the random mismatch of the devices, the different temperatures over the I/Q signal paths. IQ Calibration Techniques For CMOS Radio Transceivers describes a fully-analog compensation technique without baseband circuitry to control the calibration process. This book will use an 802.11g transceiver design as an example to give a detailed description on the I/Q gains and phases imbalance auto-calibration mechanism.

Radio circuits --- Radio --- Metal oxide semiconductors, Complementary. --- Wireless communication systems. --- Design and construction. --- Transmitter-receivers. --- Engineering. --- Electronics. --- Microelectronics. --- Electrical engineering. --- Electronic circuits. --- Communications Engineering, Networks. --- Circuits and Systems. --- Electronics and Microelectronics, Instrumentation. --- Signal, Image and Speech Processing. --- Electron-tube circuits --- Electric circuits --- Electron tubes --- Electronics --- Electric engineering --- Engineering --- Microminiature electronic equipment --- Microminiaturization (Electronics) --- Microtechnology --- Semiconductors --- Miniature electronic equipment --- Electrical engineering --- Physical sciences --- Construction --- Industrial arts --- Technology --- Communication systems, Wireless --- Wireless data communication systems --- Wireless information networks --- Wireless telecommunication systems --- Telecommunication systems --- CMOS (Electronics) --- Complementary metal oxide semiconductors --- Semiconductors, Complementary metal oxide --- Digital electronics --- Logic circuits --- Transistor-transistor logic circuits --- Radio transceivers --- Radio transmitter-receivers --- Transceivers --- Transmitter-receivers --- Telecommunication. --- Systems engineering. --- Engineering systems --- System engineering --- Industrial engineering --- System analysis --- Electric communication --- Mass communication --- Telecom --- Telecommunication industry --- Telecommunications --- Communication --- Information theory --- Telecommuting --- Design and construction --- Signal processing. --- Image processing. --- Speech processing systems. --- Computational linguistics --- Electronic systems --- Modulation theory --- Oral communication --- Speech --- Telecommunication --- Singing voice synthesizers --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing --- Processing, Signal --- Information measurement --- Signal theory (Telecommunication)