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74017 Fiches technique(PDF) 8 Page - Skyworks Solutions Inc. |
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74017 Fiches technique(HTML) 8 Page - Skyworks Solutions Inc. |
8 / 10 page CX74017 On the Direct Conversion Receiver 8 Skyworks Solutions, Inc., Proprietary and Confidential 101735A Preliminary Data Subject to Change July 20, 2001 Figure 14 and Figure 15 sketch how this affects a given constellation diagram. In DCR systems however, the IQ matching is not as critical as in image-rejection architectures. Rather, it is only important insofar as the accuracy of the modulation is concerned. Analog and digital (DSP based) calibration and adaptation methods have been described so as to correct for these imbalances, for example in [15]. 101735A 14_071801 I Q gain imbalance ideal constellation Figure 14. IQ Demodulator Imperfections (Gain Imbalance) 101735A 15_071801 I Q phase imbalance Figure 15. IQ Demodulator Imperfections (Phase Imbalance) Conclusion The direct conversion receiver is an attractive yet challenging receiving technique. It has recently been applied successfully to devices such as pagers, mobile phones, PC and internet wireless connectivity cards, satellite receivers etc. in a variety of process technologies and increasing integration levels. It is poised to appear in many more applications in the near future. References [1] L. Lessing, “Man of High Fidelity: Edwin Howard Armstrong, a Biography”, Bantam Books, New York, 1969. [2] F.M. Colebrook, “Homodyne”, Wireless World and Radio Rev., 13, p. 774, 1924. [3] D.G. Tucker, “The Synchrodyne”, Electronic Engng, 19, p. 75-76, March 1947. [4] D.G. Tucker, “The History of the Homodyne and the Synchrodyne”, Journal of the British Institution of Radio Engineers, April 1954. [5] A.A. Abidi, “Direct-Conversion Radio transceivers for Digital Communications”, IEEE Journal of Solid-State Circuits, vol. 30, no. 12, December 1995. [6] B. Razavi, “Design Considerations for Direct-Conversion Receivers”, IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, vol. 44, no. 6, June 1997. [7] S.J. Franke, “ECE 353 – Radio Communication Circuits”, Department of Electrical and Computer Engineering, University of Illinois, Urbana, 1994. [8] B. Razavi, “RF Microelectronics”, Prentice Hall, Upper Saddle River, NJ, 1998. [9] J.C. Rudell et al., “Recent Developments in High Integration Multi-Standard CMOS Transceivers for Personal Communication Systems”, International Symposium on Low Power Electronics and Design, 1998. [10] J.C. Rudell, “Issues in RFIC Design”, lecture notes, University of California Berkeley/National Technological University, 1997. [11] R. Hartley, “Single-Sideband Modulator”, U.S. Patent no. 1666206, April 1928. [12] D.K. Weaver, “A Third Method of Generation and Detection of Single Sideband Signals”, Proceedings of the IRE, vol. 44, p. 1703-1705, December 1956. [13] I.A.W. Vance, “Fully Integrated Radio Paging Receiver”, IEE Proc., vol. 129, no. 1, p. 2-6, 1982. [14] P.R. Gray, R.G. Meyer, “Analysis and Design of Analog Integrated Circuits”, Third edition, John Wiley & Sons, New York, 1993. [15] J.K. Cavers, M. W. Liao, “Adaptive Compensation for Imbalance and Offset Losses in Direct Conversion Transceivers”, IEEE Transactions on Vehicular Technology, vol. 42, p. 581-588, November 1993. |
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