924 resultados para Q-switching
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Fecha tomada del colofón
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Huecos para iniciales con letras de aviso
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Modern transmitters usually have to amplify and transmit signals with simultaneous envelope and phase modulation. Due to this property of the transmitted signal, linear power amplifiers (class A, B, or AB) are usually used as a solution for the power amplifier stage. These amplifiers have high linearity, but suffer from low efficiency when the transmitted signal has high peak-to-average power ratio. The Kahn envelope elimination and restoration technique is used to enhance the efficiency of RF transmitters, by combining highly efficient, nonlinear RF amplifier (class E) with a highly efficient envelope amplifier in order to obtain a linear and highly efficient RF amplifier. This paper presents a solution for the envelope amplifier based on a multilevel converter in series with a linear regulator. The multilevel converter is implemented by employing voltage dividers based on switching capacitors. The implemented envelope amplifier can reproduce any signal with a maximum spectral component of 2 MHz and give instantaneous maximum power of 50 W. The efficiency measurements show that when the signals with low average value are transmitted, the implemented prototypes have up to 20% higher efficiency than linear regulators used as a conventional solution.
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Tít. tomado del colofón y mención de responsabilidad de Q5v
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Imp. y fecha tomados de colofón
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Capitulares grab. xil.
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Texto e índice a dos col. con apostillas marginales
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El pie de imp. tomado del colofón
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Sign.: a10, b-z8, [et]8, [cum]8, [rum]8, A-C8, D-E6
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Lugar y fecha de imp. tomados del colofón en I8r
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Aut. tomado de Graesse
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Pie de imp. tomado del colofón
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Capitulares grab. xil.
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Il. xil.
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The Spanish tourism stakchoiders (State Tourism Administration, public tourism agencies, hospitality sector, recreational sector, travel operators, other touristic business, etc.) have developed a very powerful and practical quality certification system for all the actors in the tourism sector, including all those actors and activities in the rural tourism sector, which traditionally do not have a proper tourism system. In this framework the Institute for Spanish Tourism Quality (ICTE) administers, manages and monitors the "Spanish Tourism Quality" "Q" Mark, as an exclusive brand that announces the quality of the activity and service provided by the certified tourist business.