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Über dieses Buch

This book introduces systematic design methods for passive and active RF circuits and techniques, including state-of-the-art digital enhancement techniques. As the very first book dedicated to multiband RF circuits and techniques, this work provides an overview of the evolution of transmitter architecture and discusses current digital predistortion techniques. Readers will find a collection of novel research ideas and new architectures in concurrent multiband power dividers, power amplifiers and related digital enhancement techniques. This book will be of great interest to academic researchers, R&D engineers, wireless transmitter and protocol designers, as well as graduate students who wish to learn the core architectures, principles and methods of multiband RF circuits and techniques.



Chapter 1. RF Amplifier Design and Architectures

An amplifier receives a signal from an input source and provides a scaled version of the signal to an output device such as an antenna or to another amplifier stage. In small-signal amplifiers, the main factors are usually linearity, gain, and efficiency. For small-signal analysis, the amount of power handling capacity and power efficiency are of little concern. Large-signal devices such as power amplifiers (PAs), on the other hand, primarily provide sufficient power to an output load to drive another device, typically a few watts to tens of watts.

Wenhua Chen, Karun Rawat, Fadhel M. Ghannouchi

Chapter 2. Dual-Branch RF Amplifier Design and Architectures

The previous chapter presents the conceptual understanding of power amplifier (PA) design as well as various design considerations and parameters. In the previously presented single-branch amplifiers, efficiency is maximal only at peak power drive and drops rapidly as soon as the instantaneous input power is decreased.

Wenhua Chen, Karun Rawat, Fadhel M. Ghannouchi

Chapter 3. Multiband RF Transmitters

This chapter will introduce the transmitter solutions for multiband applications both in architecture and circuit levels. For the sake of efficiency enhancement, different multiband transmitter architectures will be discussed including multiband Doherty architecture, multiband envelope-tracking architecture, multiband outphasing architecture as well as multiband delta-sigma architecture.

Wenhua Chen, Karun Rawat, Fadhel M. Ghannouchi

Chapter 4. Multiband RF Passive Circuits

This chapter is dedicated to the design of various passive circuits for the dual-band operation.

Wenhua Chen, Karun Rawat, Fadhel M. Ghannouchi

Chapter 5. Multiband Power Amplifier Design

This chapter is dedicated to the design techniques involved in multiband power amplifier (PA) design. The chapter starts with a discussion on the various matching techniques for dual-band concurrent operation followed by reconfigurable matching networks. Following the discussion on matching networks, the chapter provides multiband continuous-class and switch-mode PA design examples. Efficiency-enhancement techniques such as the Doherty power amplifier (DPA) and envelope-tracking are also discussed in the perspective of multiband design.

Wenhua Chen, Karun Rawat, Fadhel M. Ghannouchi

Chapter 6. Digital Techniques for Multiband RF Transmitters

This chapter will discuss the nonlinear behavior of concurrent dual-band transmitters first, which is more complicated as compared to conventional single-band transmitter. To account for this phenomenon, multidimension digital predistortion (DPD) techniques are employed to compensate for the nonlinearities in dual-band transmitters including intraband modulation and interband modulation products. To alleviate the burden on the hardware-induced multidimension DPD, low-complexity 2D-modified memory polynomial method and iterative pruning method are also discussed. For hardware implementation, in order to reduce the resource consumption, a subsampling technique for the feedback loop and a hybrid LUT predistortion method are introduced.

Wenhua Chen, Karun Rawat, Fadhel M. Ghannouchi
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