H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 3/45 (2006.01) H03F 3/26 (2006.01) H03F 3/60 (2006.01)
Patent
CA 2107733
A high-frequency wide-band amplifier, of a type having one amplifier stage with at least two transistors mounted in differential stage paired in input/output to an adapter circuit, also includes, to feed each polarization voltage to the amplifier stage (22), at least one segment of high-frequency transmission line (36, 37, 45, 46) of a length near a quarter of the carrying wave length of the signal to be amplified where the returned parellel impedance at each transistor (T3, T4) is negligible with respect to high frequencies and where the series impedance is negligible in the low band of the signal to be amplified; The line segments (36, 37, 45, 46) feeding polarization voltage to the input of each transistor (T3, T4) being identical between themselves in length and impedance, as are the line segments feeding polarization voltage to the output of each transistor (T3, T4).
Un amplificateur de puissance large bande haute fréquence, du type comportant un étage amplificateur à au moins deux transistors montés en étage différentiel couplé en entrée et en sortie à un circuit d'adaptation, comporte en outre, pour amener chaque tension de polarisation sur l'étage amplificateur (22), au moins un tronçon de ligne de transmission haute fréquence (36, 37, 45, 46) de longueur voisine du quart de longueur d'onde de la porteuse du signal à amplifier dont l'impédance ramenée en parallèle sur chaque transistor (T3, T4) est négligeable vis-à-vis des hautes fréquences et dont l'impédance série est négligeable dans la bande de base du signal à amplifier ; Les tronçons de ligne (36, 37, 45, 46) amenant les tensions de polarisation sur l'entrée de chaque transistor (T3, T4) étant identiques entre eux en longueur et en impédance, de même pour les tronçons de ligne amenant les tensions de polarisation sur la sortie de chaque transistor (T3, T4).
Combe Jean-Claude
de Faria Hermino
Michel Jean
Goudreau Gage Dubuc
Thomson-Lgt Laboratoire General Des Telecommunications
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