• Sao-Jie Chen
  • Yong-Hsiang Hsieh

Part of the Analog Circuits and Signal Processing book series (ACSP)

Table of contents

  1. Front Matter
    Pages I-XIX
  2. Sao-Jie Chen, Yong-Hsiang Hsieh
    Pages 1-9
  3. Sao-Jie Chen, Yong-Hsiang Hsieh
    Pages 11-42
  4. Sao-Jie Chen, Yong-Hsiang Hsieh
    Pages 43-52
  5. Sao-Jie Chen, Yong-Hsiang Hsieh
    Pages 53-67
  6. Sao-Jie Chen, Yong-Hsiang Hsieh
    Pages 69-78
  7. Sao-Jie Chen, Yong-Hsiang Hsieh
    Pages 79-86
  8. Sao-Jie Chen, Yong-Hsiang Hsieh
    Pages 87-88
  9. Back Matter
    Pages 89-90

About this book


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.


Bluetooth CMOS DVB Filter Gain mismatch I/Q Calibration I/Q mismatches IEEE 80 Modulation Phase mismatch RF Transceiver Standards Transceiver communication

Authors and affiliations

  • Sao-Jie Chen
    • 1
  • Yong-Hsiang Hsieh
    • 2
  1. 1.National Taiwan UniversityTaipeiTaiwan
  2. 2.MuchipHsin-ChuTaiwan

Bibliographic information