Feedforward Amplifiers for Wideband Communication Systems - Rilegato

Legarda, Jon

Rilegato

ISBN 10: 038735137X ISBN 13: 9780387351377

Casa editrice: Springer Nature, 2006

Riassunto

This book has been possible thanks to the research carried out in the field of the linearization techniques applied to digital communication systems, particularly to those with high spectral efficient modulation techniques. It merges in the need of developing frequency efficient modulations with widespread codification techniques. The book puts into practice the Feedforward linearization technique, aimed at improving either the linearity or efficiency parameters of power amplifiers.

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Contenuti

Dedication. Preface. Acknowledgments. 1. Introduction. 1. Radio-Electric transmitters - Historical overview. 1.1 Arc and spark transmitters. 1.2 Multi-polar alternators. 1.3 Thermoionic vacuum tubes. 1.4 Discrete transistors. 1.5 Integrated transistors. 2. Digital communication systems. 2.1 Analog signal. 2.2 Discrete signal. 2.3 Digital signal. 2.4 Digital transmission. 2.5 Electromagnetic spectrum. 2.6 Modulation techniques. 2.7 Signal degradation. 2.7.1 Attenuation. 2.7.2 Noise. 2.7.3 Distortion. 2.8 Basic architectures of wireless transmitters. 2.8.1 Analog I/Q modulator vs. digital IF. 2.8.2 Other implementations. 3. Digital modulation. 3.1 Applications. 3.2 Phase Shift Keying. 3.3 Frequency Shift Keying. 3.4 Minimum Shift Keying. 3.5 Quadrature Amplitude Modulation. 3.5.1 I/Q offset modulation. 3.5.2 Differential modulation. 3.6 Broadband wireless access techniques. 2. Nonlinear distortion. 1. Harmonic distortion. 1.1 Nth harmonic distortion coefficient. 1.2 Global harmonic distortion. 2. Intermodulation analysis. 2.1 2 tone intermodulation. 2.2 3 tone intermodulation. 3. Cross modulation (XMOD). 3.1Cross modulation (m>1). 4. Distortion measurement techniques. 4.1 Harmonic distortion measurement. 4.2 Third order distortion measurement. 4.2.1 Two tone procedure. 4.2.2 Third order intercept point (IP3). 4.3 Second order distortion measurement. 4.4 Cross modulation (Xmod) measurement. 5. Measurements of wideband digital signals. 5.1 Peak to average power ratio and CCDF curves. 5.2 Modulation quality measurements. 5.3 Code domain power. 5.4 Adjacent Channel Leakage Ratio (ACLR). 3. RF power amplifiers. 1. Classification of power amplifiers. 2. Power amplifiers parameters. 2.1 The efficiency rate. 2.2 The back-off. 2.3 Power utilization factor (PUF). 3. Class A. 4. Class B. 5. Class AB (outphasing). 6. Class C. 7. Switching amplifiers. 7.1 Class D. 7.2 Class E. 7.3 Class F. 8. More operating modes. 4. Linearization techniques. 1. Classification of the linearization techniques. 2. Feedback. 2.1 RF Feedback. 2.2 Envelope Feedback. 2.3 Envelope and phase Feedback. 2.4 Polar Loop. 2.5 Cartesian Loop. 3. Predistortion. 3.1 RF Predistortion. 3.1.1 Simple analog Predistortion. 3.1.2 Compound Predistortion. 3.2 Envelope Predistortion. 3.3 Baseband Predistortion. 4. Feedforward. 5. Efficiency enhancement techniques. 5.1 Bypassing. 5.2 Envelope Elimination and Restoration. 5.3 Bias Adaptation. 5.4 LINC. 5.5 Doherty Method. 5.6 CALLUM. 6. Comparison of linearization techniques. 5. Feedforward amplifiers. 1. Feedforward linearization technique. 1.1 Frequency dependence. 1.2 Amplitude and phase adjustments. 1.3 Error amplifier distortion. 1.4 Isolation lack. 1.5 Main signal path loss. 2. Feedforward in wideband communications systems. 6. Implementation of Feedforward amplifiers. 1. Simulation of the Feedforward architecture. 1.1 Simulation models. 1.2 Simulation of the error loop. 1.3 Simulation of the distortion cancellation loop. 1.4 The isolation effect. 2. Selection of the error amplifier. 3. The adjustment of the cancellation loops. 3.1 Delay lines. 3.1.1 Configuration. 3.1.2 Length tolerances. 3.1.3 Packaging. 3.1.4 System design. 3.2 An adjustment method for delay lines. 4. Distortion enhanced measurement techniques. 4.1 Spectrum analyzer mixer level

Dettagli dell?edizione

• Editore: Springer Nature
• Data di pubblicazione: 2006
• ISBN 10: 038735137X
• ISBN 13: 9780387351377
• Rilegatura: Copertina rigida
• Lingua: Inglese
• Numero di pagine: 177
• Contatto del produttore: {language_tag:it_IT,value:"Springer Nature Customer Service Center GmbH; ProductSafety@springernature.com"}