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Theses

Fonctionnement des amplificateurs hautes fréquences de puissance à triode munis d'un circuit de réaction

Abstract : This work is devoted to a study of the operation of the high frequency amplifiers provided with a feedback circuit. It is shown that it is possible to take part of the amplifier output power, through use of a grounded-grid triode, and to reinject it in phase, with the signal applied to the cathode. This increases the stage gain by a factor five and makes it possible to reduce the power which must be provided by the preamplifier. The positive feedback is made through a coaxial line, the length of which is close to the wavelength. A combiner ensures the addition of the signals, at the amplifier input. The concept of output impedance of a linear amplifier has been extended to nonlinear amplifiers, of classes B and C It is based on the same relation ship which binds the variations in gain to the variations of impedance of the load that the amplifiers. The output impedance of an amplifier, with a grounded-grid triode and whose output circuit is resonant, varies little when the stage is corrected by a positive feedback.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_2001_0269_WILLMANN.pdf
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https://hal.univ-lorraine.fr/tel-01746686
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Submitted on : Thursday, March 29, 2018 - 10:42:42 AM
Last modification on : Friday, October 23, 2020 - 10:47:50 AM

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  • HAL Id : tel-01746686, version 1

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Benoît Willmann. Fonctionnement des amplificateurs hautes fréquences de puissance à triode munis d'un circuit de réaction. Autre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10269⟩. ⟨tel-01746686⟩

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