Circuit Design for Wireless Communications: Improved Techniques for Image Rejection in Wideband Quadrature Receivers

ISBN-13: 9781441953490 / Angielski / Miękka / 2010 / 208 str.

Kong-Pang Pun; Jose Epifanio Da Franca; Carlos Azeredo-Leme

Opis

Circuit Design for Wireless Communications: Improved Techniques for Image Rejection in Wideband Quadrature Receivers is the first book focusing on the subject of image rejection in wireless receiver design, which has never been so important as high level of integration is highly demanded in the current and next generation mobile terminals. In this book, the image rejection problems in various receiver architectures which are suitable for high level of integration, including image-reject, direct conversion and low IF architectures, are studied. The fundamental source of the limitation of the image rejection in these receivers is the imbalance between their in-phase (I) and quadrature (Q) channels, which becomes more problematic when the receivers are of wideband. Besides traditional methods, this book provides novel solutions to the problem, which falls into two broad types. The first type refers to new circuits that produce less I/Q imbalance. This includes high performance switched-capacitor Hilbert transformers and precise quadrature sampling circuits. The second type is to compensate the I/Q imbalance, which is possibly frequency-dependent, in digital domain by calibration or signal processing techniques. Design examples have been included. Circuit Design for Wireless Communications: Improved Techniques for Image Rejection in Wideband Quadrature Receivers serves as a very useful reference for wireless design engineers who want to improve the image rejection of their wireless receivers and researchers and students who are interested in this subject.

Spis treści

Preface. List of Abbreviations. 1: Introduction. 1.1. Motivations. 1.2. Objectives and Approaches. 1.3. Book Outline. References. 2: Wireless Receivers: Architectures and Image Rejection. 2.1. Introduction . 2.2. Why use Quadrature Modulation? 2.3. Heterodyne Receiver. 2.4. Image-Reject Receivers. 2.5. Zero-IF Receiver. 2.6. Low-IF Receiver. 2.7. Software Radio. 2.8. Summary. References. 3: Wideband 90° Phase Shifters. 3.1. Introduction. 3.2. Continuous-Time Hilbert Transformers. 3.3. Discrete-Time Hilbert Transformers. 3.4. SC Hilbert Transformers. 3.5. Summary. References. Appendix 3.A. 4: Sampled-Data Image-Rejection Receiver. 4.1. Introduction. 4.2. Architecture of the Sampled-Data Image Rejection Receiver. 4.3. Design of an SDIRRx in 0.6mum CMOS. 4.4. Chip Simulation Results. 4.5. Experimental Evaluation. 4.6. Summary. References. 5: Precise Quadrature Signal Generation by Sampling. 5.1. Introduction. 5.2. Quadrature Sampling of Real Signals. 5.3. Quadrature Sampling of Complex Signals. 5.4. Image Rejection Improvement Methods. 5.5. Summary References. 6: Digital Calibration of I/Q Mismatches. 6.1. Introduction. 6.2. Analog Calibration vs Digital Calibration. 6.3. Churchill's Method. 6.4. Statistical Method. 6.5. Wideband Calibration. 6.6. Summary. References. Appendix 6.A. Appendix 6.B. Appendix 6.C. 7: Blind Compensation of I/QMismatches. 7.1. Introduction. 7.2. The Concept of Signal-Image Separation. 7.3. Symmetric Adaptive Decorrelation Algorithm. 7.4. Simulation Results. 7.5. Summary. References. 8: Conclusions.