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Dynamic Power Supply Transmitters
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Book Synopsis Dynamic Power Supply Transmitters by : Earl McCune
Download or read book Dynamic Power Supply Transmitters written by Earl McCune and published by Cambridge University Press. This book was released on 2015-05-21 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Power is dissipated (lost) when this current flows through any resistance, which includes the amplifier's transistor. This dissipated power is the product of the current in the load times the voltage difference between the supply voltage to the amplifier and the output signal voltage. When the voltage supplied to the amplifier is a constant value, and by far the most common design practice, the situation in Fig. 1-2a results. Power dissipation in the amplifier is maximum when the output signal voltage is 1/2 of the supply voltage. When the output signal voltage is higher, even though the current value is larger the voltage drop is less and the power dissipation is lower. Similarly, when the output signal voltage is small, even though the voltage drop is now large the current in the load is smaller and again the power dissipation is lower"--
Book Synopsis Dynamic Power Supply Design for High-efficiency Wireless Transmitters by : Jason T. Stauth
Download or read book Dynamic Power Supply Design for High-efficiency Wireless Transmitters written by Jason T. Stauth and published by . This book was released on 2006 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis PMW Buck Converter as a Dynamic Power Supply for Envelope Tracking and Amplitude Modulation by : Thomas R. Salvatierra
Download or read book PMW Buck Converter as a Dynamic Power Supply for Envelope Tracking and Amplitude Modulation written by Thomas R. Salvatierra and published by . This book was released on 2015 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern energy transmission and signal reproduction techniques rely upon power amplifier (PA) architectures that must operate with high efficiency. Current-source PAs are linear but inherently inefficient; switch-mode PAs are efficient-yet-nonlinear systems, often lacking an efficient means of amplitude modulation (AM) for power transmission. A promising technique for addressing these problems involves replacing the fixed PA supply voltage V[sub]dd with a controlled, variable voltage provided by a dynamic power supply. High-efficiency envelope tracking and amplitude modulation can thereby be provided to both current-source and switch-mode PAs, respectively. This work presents a pulse-width modulated (PWM) DC-DC buck converter for use as the core power stage of a dynamic supply. Although buck converters typically function as fixed-output supplies, this work provides new theoretical dc analysis for operation wherein the output voltage is controlled and variable over a wide, continuous range. A new design procedure for the variable-output PWM dc-dc buck converter is derived. The new dc analysis and design procedure are verified experimentally. Open-loop ac characteristics, such as transient response, frequency response, and dynamic modulation efficiency are assessed via simulation and experimental measurements. The variable-output buck converter is found to operate as designed, with bandwidth dependent upon a sufficiently high PWM switching frequency f[sub]s. Within this bandwidth, minimal modulation distortion is observed, measured efficiency is greater than 90%, and supplied power-on-demand is verified.
Book Synopsis An Approach to Implement Kahn's Technique with Dynamic Power Supply by : Sowjanya Kommu
Download or read book An Approach to Implement Kahn's Technique with Dynamic Power Supply written by Sowjanya Kommu and published by . This book was released on 2016 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radio-frequency power amplifiers are an integral part of today's communication systems. Primary importance is given to improve its efficiency and linearity, which are required for the effective signal transmission. Three main architectures on which, the efficiency of communication systems are based on are: (a) Kahn's technique, (b) Doherty's power amplifiers, and (c) Cheireix out-phasing modulation. Several schemes to implement these techniques exist in literature and their study is very diverse. In this thesis, a detailed literature survey on these techniques is presented, which includes their operation, properties, advantages, disadvantages, and areas of potential applications. This main objective of this thesis is to adopt the Kahn's architecture and implement the various electrical blocks using the latest technology. The main building blocks of the described architecture are: AM/PM signal generator, amplitude detector, dynamic power supply, and a radio-frequency power amplifier. The circuit operation, properties, and circuit-level implementation of all these blocks are presented. The design of a pulse-width modulated buck dc-ac converter used as a dynamic power supply is given. The amplitude-modulated Class-D radio-frequency power amplifier is designed and its performance is evaluated. Each of the circuit-level implementations of the various blocks were designed, built, and simulated on SABER circuit simulator. A test audio signal with frequency 2.5 kHz is generated in the AM/PM signal generator block. A buck dynamic power supply operates at a fixed supply voltage of 25 V with its output voltage varying between 3 V to 23 V. The Class-D radio-frequency power amplifier is designed to generate a carrier frequency of 250 kHz. The efficiency of each stage was determined.
Book Synopsis Dynamic Supply Voltage RF Power Amplifiers for Wireless Applications by : Gary Joseph Hanington
Download or read book Dynamic Supply Voltage RF Power Amplifiers for Wireless Applications written by Gary Joseph Hanington and published by . This book was released on 1999 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Engineering Handbook by : National Association of Broadcasters
Download or read book Engineering Handbook written by National Association of Broadcasters and published by Newnes. This book was released on 1992 with total page 1362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energy Efficient Wireless Transmitters by : Jason Thaine Stauth
Download or read book Energy Efficient Wireless Transmitters written by Jason Thaine Stauth and published by . This book was released on 2008 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Short Range Radio Telemetry for Rotating Instrumentation by : Joseph Valentich
Download or read book Short Range Radio Telemetry for Rotating Instrumentation written by Joseph Valentich and published by . This book was released on 1977 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of Engineering for Power by :
Download or read book Journal of Engineering for Power written by and published by . This book was released on 1968 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Society of Mechanical Engineers. Diesel and Gas Engine Power Division Publisher : ISBN 13 : Total Pages :544 pages Book Rating :4.:/5 (31 download)
Book Synopsis Annual Proceedings of the Diesel and Gas Engine Power Division by : American Society of Mechanical Engineers. Diesel and Gas Engine Power Division
Download or read book Annual Proceedings of the Diesel and Gas Engine Power Division written by American Society of Mechanical Engineers. Diesel and Gas Engine Power Division and published by . This book was released on 1968 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the International Instrumentation Symposium by :
Download or read book Proceedings of the International Instrumentation Symposium written by and published by . This book was released on 1994 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Physics by : Ernest Oscar Bower
Download or read book Dynamic Physics written by Ernest Oscar Bower and published by . This book was released on 1955 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Power Efficiency Enhancement of Transmitters Using Adaptive Envelope Tracking and Shaping Techniques for Small Payload Space Applications by : Hafiz Faisal Rasool
Download or read book Power Efficiency Enhancement of Transmitters Using Adaptive Envelope Tracking and Shaping Techniques for Small Payload Space Applications written by Hafiz Faisal Rasool and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rise of modular system architecture for distributed satellite systems with multiple small payloads instead of conventional larger spacecrafts, the efficient characterization of power budget and available power constraints become even more vital. In order to establish high data rate downlink com munications in small satellite applications, use of highly efficient, non - conventional power amplification techniques is going to be a key factor in future communication systems. The concept of having small, less power consuming and high data rate transmis sion system extends to vast number of applications like light weight Unmanned Aerial Vehicle (UAV) and hand - held communication modules etc. The idea is to study and develop an adaptive envelope tracking technique which should be able to dynamically supply power to Radiofreq uency power amplifier. Consequently, a n optimal control over system power consumption leads to enhanced efficiency. The amplifiers intended for such systems exhibit nonlinear behavior when it comes to operating at maximum output power an d cause distortion in adjacent bands. Introducing a power supply modulation block in combination with digital linearization techniques such as DPD offers considerable improvement. Th is thesis tests a dynamic power supply adaptive shaping technique f or LTE signals. In comparison to conventional fixed supply RF PAs, Envelope Tracking PA has resulted in improved linearity at the output as well as reduced unwanted power leakage into adjacent frequency channels. By imposing an isogain trajectory trough th e shaping function, we can optimize the available power for high data rate communications while keeping the intermodulation distortion at acceptable levels by considering a tradeoff between efficiency and computational load.
Book Synopsis RF and Microwave Power Amplifier Design by : Andrei Grebennikov
Download or read book RF and Microwave Power Amplifier Design written by Andrei Grebennikov and published by McGraw Hill Professional. This book was released on 2004-08-25 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a rigorous tutorial on radio frequency and microwave power amplifier design, teaching the circuit design techniques that form the microelectronic backbones of modern wireless communications systems. Suitable for self-study, corporate training, or Senior/Graduate classroom use, the book combines analytical calculations and computer-aided design techniques to arm electronic engineers with every possible method to improve their designs and shorten their design time cycles.
Download or read book Proceedings written by and published by . This book was released on with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Optics written by and published by . This book was released on 1998 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Power Engineering written by and published by . This book was released on 1981 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
