Author: Eric Kerhervé Publisher: Elsevier ISBN: 0124186815 Category : Technology & Engineering Languages : en Pages : 163
Book Description
This book provides an overview of current efficiency enhancement and linearization techniques for silicon power amplifier designs. It examines the latest state of the art technologies and design techniques to address challenges for RF cellular mobile, base stations, and RF and mmW WLAN applications. Coverage includes material on current silicon (CMOS, SiGe) RF and mmW power amplifier designs, focusing on advantages and disadvantages compared with traditional GaAs implementations. With this book you will learn: The principles of linearization and efficiency improvement techniques The architectures allowing the optimum design of multimode Si RF and mmW power amplifiers How to make designs more efficient by employing new design techniques such as linearization and efficiency improvement Layout considerations Examples of schematic, layout, simulation and measurement results Addresses the problems of high power generation, faithful construction of non-constant envelope constellations, and efficient and well control power radiation from integrated silicon chips Demonstrates how silicon technology can solve problems and trade-offs of power amplifier design, including price, size, complexity and efficiency Written and edited by the top contributors to the field
Author: J.L. Dawson Publisher: Springer Science & Business Media ISBN: 140208062X Category : Technology & Engineering Languages : en Pages : 144
Book Description
Improving the performance of the power amplifier is the most pressing problem facing designers of modern radio-frequency (RF) transceivers. Linearity and power efficiency of the transmit path are of utmost importance, and the power amplifier has proven to be the bottleneck for both. High linearity enables transmission at the highest data rates for a given channel bandwidth, and power efficiency prolongs battery lifetime in portable units and reduces heat dissipation in high-power transmitters. Cartesian feedback is a power amplifier linearization technique that acts to soften the tradeoff between power efficiency and linearity in power amplifiers. Despite its compelling, fundamental advantages, the technique has not enjoyed widespread acceptance because of certain implementation difficulties. Feedback Linearization of RF Power Amplifiers introduces new techniques for overcoming the challenges faced by the designer of a Cartesian feedback system. The theory of the new techniques are described and analyzed in detail. The book culminates with the results of the first known fully integrated Cartesian feedback power amplifier system, whose design was enabled by the techniques described. Feedback Linearization of RF Power Amplifiers is a valuable reference work for engineers in the telecommunications industry, industry researchers, academic researchers.
Author: Si-Wook Yoo Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 122
Book Description
As wireless communication standards evolve, radio frequency (RF) transmitter (TX) systems with higher linearity and wider bandwidth at increased output power (POUT) are required to meet the high demand for faster communication speeds and increased data traffic. Meanwhile, mobile and wearable applications require a smaller form factor and low-cost solutions. Low power consumption is also critical for increased battery life, which improves user experience. Digital TX is a promising architecture for a small area and low power consumption because conventional TX sub-blocks, such as digital-to-analog converter (DAC), mixer, driving amplifier, and power amplifier (PA), can be merged into a single block. Furthermore, the linearity, area, and power consumption of a digital TX can be significantly enhanced with the evolution of complementary metal oxide semiconductor (CMOS) technology that provides faster operation and finer segmentation at lower power dissipation. It is easy to migrate to the next generation CMOS process because the digital TX mostly comprises digital circuits. These advantages are more critical when there are multiple TXs in a single system, such as multi-standard and multi-in multi-out systems. A switched-capacitor (SC) PA or an SC RFDAC is employed as a base architecture in this study, ideally providing 100% peak efficiency as a segmented switching-mode PA; further, unlike conventional PAs, it does not suffer from a large output signal swing that modulates output impedance, causing amplitude and phase nonlinearities.This study demonstrates various architectures and design techniques for compact, highly efficient, and highly linear digital TXs. The contributions of this study are as follows:First, a watt-level highly efficient and highly linear quadrature digital TX with a dual-supply Class-G quadrature IQ-cell-shared SCPA architecture is proposed, which maximizes the POUT and efficiency of the quadrature digital TX. To enable the Class-G operation in the quadrature IQ-cell-shared SCPA architecture, a merged-cell-switching technique is proposed. Linearization techniques for the Class-G operation are proposed to compensate for the amplitude and phase mismatches between the two Class-G modes.Second, a compact and highly linear quadrature digital TX based on quadrature IQ-cell-shared SC RFDAC with linearization techniques is proposed; the linearization techniques increase the TX dynamic range by improving the TX linearity in both high and low POUT regions. Impedance linearization techniques for the output stage and an offset mid-tread code mapping technique improve the TX linearity in the high and low POUT regions, respectively. The area and power consumption of the RFDAC are minimized by sharing sub-circuits between the two RFDAC cells.Finally, a multimode multi-efficiency-peak SCPA architecture is proposed to maximize power back-off (PBO) efficiency in a polar digital TX. The multimode operation is achieved through an efficient combination of the dual-supply Class-G, Doherty, and 2-way time-interleaving techniques, thus, maximizing the PBO efficiency by introducing six efficiency peaks down to 18-dB PBO. A single-supply current-reuse Class-G switch is proposed for the highly efficient Class-G operation without any additional power management unit. Moreover, a LO-signal-restoration technique is presented to minimize both the power dissipation and area for the LO signal distribution.
Author: Jingshi Yao Publisher: ISBN: 9780542535215 Category : Languages : en Pages : 246
Book Description
RF power amplifiers (PA) are among the key building blocks for wireless communication systems. Current digital communication standards need both high linearity and power efficiency. Generally, there is a conflict between the linearity and efficiency of power amplifiers. The Chireix's outphasing power amplifier is one of the promising techniques that can be used as a linearization and efficiency enhancement technique.
Author: Hossein Hashemi Publisher: Cambridge University Press ISBN: 1107055865 Category : Technology & Engineering Languages : en Pages : 471
Book Description
Build high-performance, energy-efficient circuits with this cutting-edge guide to designing, modeling, analysing, implementing and testing new mm-wave systems.
Author: Millie Pant Publisher: Springer Nature ISBN: 9811540322 Category : Technology & Engineering Languages : en Pages : 1093
Book Description
This book focuses on soft computing and how it can be applied to solve real-world problems arising in various domains, ranging from medicine and healthcare, to supply chain management, image processing and cryptanalysis. It gathers high-quality papers presented at the International Conference on Soft Computing: Theories and Applications (SoCTA 2019), organized by the National Institute of Technology Patna, India. Offering valuable insights into soft computing for teachers and researchers alike, the book will inspire further research in this dynamic field.
Author: Naser Ojaroudi Parchin Publisher: AVID SCIENCE ISBN: 9388170822 Category : Technology & Engineering Languages : en Pages : 207
Book Description
With the development of mobile 4G communication system, people’s requirements for the speed of wireless communication are rapidly increasing. In order to meet this need, the research and development of the fifth generation (5G) wireless systems has been carried out. Compared with previous generation (1G~4G), 5G will have significant improvements in transmission rate, latency, mobility and so on. The book “Microwave/RF Components for 5G Front-End Systems” is outlines the simulation, design, and fabrication of microwave components including Antennas, Filters, and Power Amplifiers for 5G wireless communications. In addition, exhaustive reviews have been presented, classifying the various types and applications of reconfigurable antennas, Filters and amplifiers for current and future wireless networks.
Author: Raed A. Abd-Alhameed Publisher: MDPI ISBN: 3039362127 Category : Technology & Engineering Languages : en Pages : 292
Book Description
This book addresses the true innovation in engineering design that may be promoted by blending together models and methodologies from different disciplines, and, in this book, the target was exactly to follow this approach to deliver a new disruptive architecture to deliver these next-generation mobile small cell technologies. According to this design philosophy, the work within this book resides in the intersection of engineering paradigms that includes “cooperation”, “network coding”, and “smart energy-aware frontends”. These technologies will not only be considered as individual building blocks, but re-engineered according to an inter-design approach resulting in the enabler for energy efficient femtocell-like services on the move. The book aims to narrow the gap between the current networking technologies and the foreseen requirements that are targeted at the future development of the 5G mobile and wireless communications networks in terms of the higher networking capacity, the ability to support more users, the lower cost per bit, the enhanced energy efficiency, and adaptability to new services and devices (for example, smart cities, and the Internet of things (IoT)).
Author: Eric Kerhervé
Author: J.L. Dawson
Author: Asdesach Zena Markos
Author: Si-Wook Yoo
Author: Jingshi Yao
Author: Hossein Hashemi
Author: Millie Pant
Author: Naser Ojaroudi Parchin
Author: Raed A. Abd-Alhameed
Author: Paulo Augusto Dal Fabbro