Envelope Tracking Power Amplifiers for Wireless by Zhancang Wang

By Zhancang Wang

This booklet provides whole advent, conception, and layout issues on envelope monitoring for instant communications.

Show description

Read Online or Download Envelope Tracking Power Amplifiers for Wireless Communications PDF

Best microwaves books

Digital terrestrial broadcasting networks

Electronic Terrestrial Broadcasting Networks addresses the difficulty of frequency and community making plans for electronic terrestrial broadcasting platforms with a spotlight on electronic Audio Broadcast and electronic Video Broadcast. the writer provides proper terrestrial broadcasting platforms in addition to the final overseas framework of spectrum administration.

Microwave Filters, Impedance-Matching Networks, and Coupling Structures (Artech Microwave Library)

No microwave engineer's library is entire with no this accomplished 1100 web page quantity - broadly thought of to be the main valuable microwave layout reference ever released. The e-book info primary thoughts, suggestions, and knowledge of basic use within the layout of a variety of constructions. additionally, really expert facts is featured which makes it effortless to determine functional, particular designs.

Optical Coatings: Material Aspects in Theory and Practice

Optical coatings, i. e. multilayer stacks composed from a definite variety of skinny person layers, are a vital a part of any optical method essential to tailor the houses of the optical surfaces. Hereby, the functionality of any optical coating is outlined through a well-balanced interaction among the houses of the person coating fabrics and the geometrical parameters (such as movie thickness) which outline their association.

FDTD Modeling of EM Field inside Microwave Cavities

This ebook bargains with the EM research of closed microwave cavities in accordance with a 3-dimensional FDTD strategy. The EM research is conducted for (i) oblong microwave ovens and (ii) hybrid-cylindrical microwave autoclaves at 2. forty five GHz. the sphere distribution is first expected within family oblong ovens in xy-, yz-, and zx-plane.

Additional resources for Envelope Tracking Power Amplifiers for Wireless Communications

Sample text

Unlike the GaAs HBT process, deep submicron CMOS technologies use a chemical polishing to planarize the surface of the wafer at various manufacturing steps [38, 39]. The substrate in a CMOS technology is a semiconductor material with electrical conductivity that depends on the substrate doping level. In an epitaxial CMOS technology, a high-conductivity epitaxial layer is grown on top of the substrate. The GaAs substrate used in an HBT technology is semi-insulating, and hence, conductivity is quite low compared to a silicon substrate.

A parameter often reported when comparing transistors for RF applications is the cutoff frequency fT. The cutoff frequency is defined as the frequency in which the current gain of the transistor is extrapolated to fall to unity when the device is terminated with a small-signal short circuit. The cutoff frequency is a function of the bias current of a device. In recent decades, CMOS gate lengths are shrunk and gate oxides have become much thinner. These advances are clearly the significantly increased fT and fmax of the silicon-based technologies to the point that their performance now rivals that of GaAs devices.

With this kind of structure, the second efficiency peak moves to a 9-dB back-off position to tolerate signals with higher PAPR. However, the region between the two efficiency peaks will suffer from more severe efficiency drooping down issue. 27, with a ratio of 1:3 and 12 dB back-off. 28, and more complex memory effects. 26 The efficiency curve comparison among uneven Doherty, even Doherty, and classAB/B PAs. 27 The principle and schematic diagram of uneven Doherty PA with 9 dB back-off peak efficiency point.

Download PDF sample

Rated 4.84 of 5 – based on 17 votes