Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Outphasing"”.
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Techniques for high-efficiency outphasing power amplifiers
… are proposed. The first technique is called the outphasing energy recovery amplifier (OPERA), which recovers the normally wasted power back to the power supply and utilizes a resistance compression network for improved linearity. A 48-MHz, 20-W prototype OPERA system was built which demonstrates …
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Efficiency improvement in nanometre CMOS outphasing power amplifiers
… mobile data rates and battery lifetimes. The outphasing transmitter is one such technique that warrants research as it has yet to achieve commercial viability. It operates by decomposing a modulated signal into two constant-amplitude signals with a phase difference corresponding to the …
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Linear Operation of Switch-Mode Outphasing Power Amplifiers
… Our research focuses on the mechanisms within outphasing power amplifiers which prevent linear amplification. From the analysis it was clear that high power non-linear effects are correctable with currently available techniques however non-linear effects around the zero crossing point are not. …
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A fully-integrated all-digital outphasing transmitter for wireless communications
… research is to present a new all-digital outphasing transmitter IC, a comprehensive explanation of its operation, and its performance characterization. The all-digital transmitter chip leverages flexible digital phase modulators (DPMs) to adaptively compensate for amplifier mismatches. As …
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Amplitude and phase modulation techniques for an asymmetric multi-level outphasing transmitter
New techniques for improving outphasing transmitters show potential of breaking the traditional linearity-efficiency trade-off by using highly efficient non-linear switching Power Amplifiers (PAs). This work focuses on two of the main building blocks of modem outphasing systems, the power supply …
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Lossless multi-way power combining and outphasing for radio frequency power amplifiers
… work describes a new power combining and outphasing system that provides both high efficiency and dynamic output power control. The introduced system combines power from four or more PAs, and overcomes the loss and reactive loading problems of previous outphasing systems. It provides …
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Digital assistance design for analog systems : digital baseband for outphasing power amplifiers
… through the digital baseband design for outphasing power amplifiers. In the digital baseband design, this thesis conveys two major points: the importance of the use of the reduced-complexity system modeling techniques, and the communications between hardware design and system modeling. …
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Power supply switching for a mm-wave asymmetric multilevel outphasing power amplifier system
… to be used in our new Asymmetric Multilevel Outphasing (AMO) transmitter architecture at mm-wave frequencies. The AMO topology breaks the linearity vs. efficiency design objective in radio frequency power amplifiers (PAs) which has until now appeared to be fundamental. These power switches …
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Phase manipulation for efficient radio frequency transmission
… often is achieved at the expense of efficiency. Outphasing architectures, which combine multiple nonlinear but efficient switching PAs into a system with an overall linear response, represent a promising strategy for breaking the efficiency/linearity tradeoff inherent to conventional PAs. This …
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Class-E Power Amplifiers in Modern RF Transmitters
… 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 modulation transmitters based on class-E power amplifiers. The first contribution is an analytical …
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Efficient baseband design and implementation for high-throughput transmitters
… millimeter wave communication systems based on outphasing power amplifiers (PAs), we have explored ways to implement high-throughput outphasing baseband functions with the smallest energy and area footprints. Aware of the limitations of field-programmable gate arrays (FPGA) in throughput and …
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Vector modulators for analog-beamforming receivers
… this concept with the phase-oversampling and outphasing VM architectures. The phase-oversampling VM applies the mathematical concept of overcomplete expansion and coarse quantization to replace the complex radio-frequency variable-gain amplifiers used in conventional VMs with simple switches …
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Flexibler Modulator und Digitalverstärker-MMIC für den energieeffizienten Betrieb einer digitalen Sendekette im GHz-Bereich
… Single-Ended-Verstärkermodulen zusammengesetztes Outphasing-Modul mit nur minimalen Anpassungen in der Konfiguration des Modulators betrieben und vermessen wird. Viele weitere Verstärkerarten können allein durch Konfigurationsänderungen in der Software erschlossen werden.
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Wide bandwidth high efficiency power converter for rf amplifiers
… predistorsión, prealimentación, Doherty, Outphasing, Khan (EER, Envelope Elimination & Restoration), etc. Casi todas se han mostrado limitadas para proporcionar linealidad a amplificadores de alto rendimiento fuertemente alinéales en todo el margen dinámico de la señal amplificada. Solo la …