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Showing 1 to 20 of 105 for “"Doherty"”.
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Efficiency Enhancement of Base Station Power Amplifiers Using Doherty Technique
… has been investigated in this research. The Doherty technique consists of two amplifiers in parallel; in such a way that the combination enhances the power added efficiency of the main amplifier at 6dB back off from the maximum output power. The classes of operation of power amplifier (A, AB, …
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Feldspar thermal states as an indicator of relative ages in the Mt. Doherty igneous complex.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Digitally-assisted, efficiency enhanced, linear RF power amplifier architectures
… to boost the efficiency of a dual-input LDMOS Doherty PA of 500W peak power. It is shown that the improved phase adjustment and the waveform conditioning for the Auxiliary PA, results in ~ 4% improvement in the efficiency of the Doherty PA. This efficiency improvement comes at the cost of …
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Broadband and Energy-Efficient Power Amplifier Architectures
… that has similar efficiency performance to the Doherty amplifier, while it does not utilize any power combiner at the output. In the proposed TLLM amplifier, the two amplifier branches are connected directly together and provide high efficiency for high PAPR (Peak-to-Average Power Ratio) …
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Linear Power-Efficient RF Amplifier with Partial Positive Feedback
… the more extensively researched solutions, the Doherty amplifier, is given, and its inherent limitations are discussed. A recently proposed amplifier topology that provides the efficiency benefits of the Doherty amplifier, while overcoming some of the fundamental problems that plague the …
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Constraints on the distribution of subject contact causes
… function. In arguing a wider distribution, Doherty (1993) is the first to challenge these accounts. In additional to the core environments listed above, it is observed that the construction is also permissible in the case of NPs headed by a universal quantifier or by 'free-choice any' and …
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Class-E Power Amplifiers in Modern RF Transmitters
… 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 modulation transmitters based on class-E power amplifiers. The first contribution …
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Analog and Digital Co-design Methods for Future Wireless Transmitters
… the complex nature of the signals involved, the Doherty power amplifier (DPA) architecture has indicated promise over the years. In this work, further improvements have been made on existing state-of-the-art Doherty PA architectures to aid wider-bandwidth operation to transmit at higher data …
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Investigation and Design of New, Efficient and Compact Load Modulation Amplifiers for 5G Base Stations. Design, Simulation, Implementation and Measurements of Radio Frequency Power Amplifiers Using Active Load Modulation Technique for More Compact and Efficient 5G Base Stations Amplifiers
… Among the efficiency enhancement techniques, the Doherty technique (Load modulation technique) is the simplest one, where no additional circuity nor signal processing is required. In this work, the theory of load modulation amplifiers is investigated through two asymmetrical Doherty Power …
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An Empirical Evaluation of Property-Liability Insurance Financial Ratemaking Models
… Myers and Cohn's discounted cash flow model, and Doherty and Garven's option pricing model. The goal of this research is to identify promising models for regulators and actuaries and illustrate how they can be used with individual company data.
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Is Marriage Education Effective? A Meta-Analytic Review of Marriage Education Programs
… Is marriage education effective (Carroll & Doherty, 2003; Halford, Markman, Kline & Stanley, 2003; Reardon-Anderson, Stagner, Macomber, & Murray, 2004)? However, previous meta-analytic studies have been somewhat limited in their conclusions because they have reviewed a narrow portion of the …
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Energy efficient radio frequency system design for mobile WiMax applications. Modelling, optimisation and measurement of radio frequency power amplifier covering WiMax bandwidth based on the combination of class AB, class B, and C operations.
… This research work explores how to use the Doherty technique to promote efficiency enhancement and thus energy saving. Five different topologies of RF power amplifiers have been designed with custom-made signal splitters. The design core of the Doherty technique is based on the combination …
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Faculty and staff attitudes toward marijuana use and policy: perceptions of dangerousness and legalization
… legalization has increased significantly (Green, Doherty, & Ensminger, 2017; Resko et al., 2019). As attitudinal research has been found to affect policy, the current study focused on perceptions toward marijuana use and policy among university faculty and staff to determine whether demographic, …
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Evaluation of Sponsorship Activation Strategies Employed by a Minor League Baseball Team
… & Park, 2006) accessing specific target markets (Doherty & Murray, 2007), developing goodwill (Meenaghan, 2001), and positioning the brand (Ferreira, Hall, & Bennett, 2008). With so many differing objectives, it can be difficult to identify and/or develop standard rules, measurement scales, or …
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Amplifier Architectures for Wireless Communication Systems
… noise amplifiers (LNAs) for RF receivers and the Doherty technique is analyzed for efficiency enhancement for power amplifiers (PA) on the transmitters. This work can be outlined in two parts.</p> <p>In the first part, Low Noise RF amplifier designs with Bipolar Junction Transistor (BJT) are …
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School-Home Performance Feedback with Home-Based Writing Activities: the Effects on Elementary Students’ Writing Fluency
… and behavioral competency (Christenson, 2004; Doherty & Peskay, 1992; Henderson, 2007). Studies have suggested that parents and teachers prefer programs that utilize school-home feedback notes and provide parents with strategies for implementing educational activities at home (Gettinger & …
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Targeted Re-Instruction for Hearing Aid Use and Care Skills
… Aid Skills Test – Revised (PHAST-R; Desjardins & Doherty 2009; Doherty & Desjardins 2012) and provided targeted re-instruction. Hearing aid use and care skills were measured using the Hearing Aid Skills and Knowledge (HASK; Saunders et al. 2018) test immediately following the hearing aid fitting …
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Perception of control and marital adjustment
… This second finding was opposite to that of Doherty (1981) and Mlott and Lira (1977). Tentative explanations for this discrepancy involving conventional versus unconventional role performance, marital hierarchy, and possible intervening variables such as interpersonal trust were discussed. …
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