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Microwave Power Amplifier Fundamentals
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Giga-tronics Incorporated
2009
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An amplifier is one of the most common electrical elements in any system. The requirements for amplification are as varied as the systems where they are used. Amplifiers are available in a large number of form factors ranging from miniscule ICs to the largest high-power transmitter amplifiers. In the following discussion the focus will be on solid state power amplifiers used at microwave frequencies, particularly in test and measurement applications...
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Comment
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High efficiency power amplifiers
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Ericsson
2008
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The authors describe the critical aspects and limitations of highly efficient
PA technology and indicate where new technology is needed to
reach the industry’s ambitious goals for greater efficiency.
By Bo Berglund, Jan Johansson and Thomas Lejon..
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Comment
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Dynamic Bias Circuits for Efficiency Improvement of RF Power Amplifier
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Department of Electrical Engineering, Tamkang University
2008
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This work presents a dynamic gate bias circuit for bias control to
maximize power added efficiency based on the class-A two-stage power
amplifier. The proposed circuits are composed of two NMOS transistors, a
capacitor for coupling RF input signal, and four resistors for bias. The circuit
is implemented by means of the bias control at the two-stage power amplifier
to improve the overall power added efficiency and delivers 22dBm output
power at 2.4 GHz. T..
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Comment
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LNA design for CDMA front end
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Philips Semiconductor, Published by RF Design
2008
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This Article goes over the practical aspects of design of a front end 900 MHz and 1.9 GHz low noise amplifier. This main topics this article covers are Biasing, Circuit Stabilizing, Noise Optimization, Linearity optimization and Load Pull for Gain and IP3 Trade-off improvement...
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Comment
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A Fully-Integrated 1.8-V, 2.8-W, 1.9-GHz, CMOS Power Amplifier
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Cadence University
2008
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This paper demonstrated the first 2-stage, 2.8W, 1.8V, 1.9GHz fully-integrated DAT power amplifier with 50O input and output matching using 0.18µm CMOS transistors. It has a small-signal gain of 27dB. The amplifier provides 2.8W of power into a 50O load with a PAE of 50%.
by I. Aoki, S. Kee, D. Rutledge, and Ali Hajimiri..
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Comment
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Broadband VHF/UHF Amplifier Design Using Coaxial Transformers
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High Frequency Electronics
2008
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This article describes the methods used to design broadband coaxial transformer matching networks for an LDMOS power amplifier that delivers consistent performance over more than a decade bandwidth.
By C. G. Gentzler and S.K. Leong from Polyfet RF Devices - High Frequency Electronics..
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Comment
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Power Amplifier Design
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Hong Kong Polytechnic University
2008
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A Presentation going over the basics of RF Power Amplifier Design such as S-Parameters, Matching and Stability.
from the Department of Electronic and Information Engineering, Hong Kong Polytechnic University by Michael Tse..
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Comment
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A 1.2V, 2.4GHz Fully Integrated Linear CMOS Power Amplifier with Efficiency Enhancement
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University of California
2008
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A 2.4GHz power amplifier with on chip output matching. A technique for enhancing average efficiency is proposed and demonstrated. This technique does not degrade instantaneous efficiency at peak power and maintains constant power gain with power back-off.
By Gang Liu, Tsu-Jae King Liu and Ali M. Niknejad from The University of California, Berkeley..
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Comment
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Microwave Amplifiers
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University of San Diego
2008
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The Design of Microwave Transistor Amplifiers Using S Parameters - from The University of San Diego..
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Comment
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