Global ETD Search
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Showing 1 to 9 of 9 for “"drain efficiency"”.
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Class E amplifiers and their modulation behaviour
The Class E power amplifier has very high drain efficiency under quasi-static conditions, and is a good candidate for Envelope Elimination and Restoration (EER) or other polar techniques. Unfortunately it has an unusual carrier frequency response, for which no analytic expression was known; this …
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Design of Class-E Radio Frequency Power Amplifier
… RF transceivers. Therefore, the design of a high-efficiency radio frequency power amplifier is the most obvious solution to overcoming the battery lifetime limitation in the portable communication systems. A power amplifier's classes (A, AB, B, C, F, E, etc), and design techniques (Load-pull and …
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Broadband RF Power Amplifier Design Methodology Using Sequential Harmonic Characterization
… any improvement in terms of dissipated power and efficiency of the power amplifier affects the overall power budget of the transmitter. Also, efficient performance of the RF power amplifier over extended ranges of frequency is one of the most challenging areas in implementing multi-band …
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Análise de recalques do aterro experimental II sobre a argila mole de Sarapuí com elementos drenantes
… sections being five of them with vertical drains and the other two with no vertical drains. The methods used for the calculation of final settlements and coefficients of consolidation were ASAOKA, ELLSTEIN, LONG e CAREY and TAN. For the calculation of the final settlement the conventional …
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Exploiting Spatial Degrees-of-Freedom for Energy-Efficient Next Generation Cellular Systems
… green communication issues, including energy efficiency, peak-to-average power ratio (PAPR) reduction and power amplifier (PA) linearization. Green communication is expected to be a primary goal in next generation cellular systems because it promises to reduce operating costs. The first key …
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Digitally enhanced CMOS RF transmitter with integrated power amplifier
… signals are transmitted, a high TX average power efficiency is achieved exploiting the dynamic current biasing of the Class-B PA and a low-loss output matching network using high-Q bondwire inductances in the package. Assisted by an integrated feedback path, a two-dimensional, digital look-up …
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Efficiency Enhancement of Base Station Power Amplifiers Using Doherty Technique
… is achievable, it always comes at the expense of efficiency. Most of the modern wireless applications such as WCDMA use non-constant envelope modulation techniques with a high peak to average ratio. Linearity being a critical issue, power amplifiers implemented in such applications are forced to …
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Class-E Power Amplifiers in Modern RF Transmitters
… communication systems. In order to improve efficiency of wireless systems, advanced transmitter architectures, such as Doherty amplifiers, outphasing amplifiers, supply voltage modulation techniques are widely used. The goal of this work is to develop novel techniques for building load …
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Integrated Wideband Self-Interference Cancellation Techniques for FDD and Full-Duplex Wireless Communication
… communication potentially increases spectral efficiency within existing RF standards. This will allow the combination of dedicated transmitting and receiving bands into a single band which would more than double the spectral efficiency. However, this leads to an extremely challenging problem …