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Machine translation
1. (WO1980001227) SELECTIVE AMPLIFIER
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001227    International Application No.:    PCT/JP1979/000308
Publication Date: 12.06.1980 International Filing Date: 30.11.1979
IPC:
H03F 1/42 (2006.01), H03F 1/56 (2006.01), H03F 3/191 (2006.01), H03F 3/193 (2006.01), H03F 3/195 (2006.01)
Applicants:
Inventors:
Priority Data:
78/151339 06.12.1978 JP
Title (EN) SELECTIVE AMPLIFIER
(FR) AMPLIFICATEUR SELECTIF
Abstract: front page image
(EN)A selective amplifier adapted to exhibit uniform gain characteristics over the entire band of a frequency to be amplified without deterioration of signal-to-noise ratio. The amplifier includes an amplifying element (AMP) and a bandpass filter (BPF). A resister for removing ripples in the transmission characteristics of the filter serves as a feedback resister (Rf) for the amplifying element (AMP). Further, a coil (LB) in a parallel resonant circuit (CB, LB) of the filter (BPF) and a capacitor (CA) in a series resonant circuit (CA, LA) of the filter are composed of, respectively, a boosting transformer and the capacitance of a capacitive antenna, thereby improving signal-to-noise ratio. The amplifier is suitable for use in the first high frequency stage of a radio receiver.
(FR)Un amplificateur selectif est concu pour avoir des caracteristiques de gain uniformes sur toute la bande d"une frequence a amplifier sans deterioration du rapport signal-bruit. L"amplificateur comprend un element d"amplification (AMP) et un filtre passe-bande (BPF). Une resistance de supression des ondulations dans les caracteristiques de transmission du filtre sert aussi comme resistance de reaction (Rf) pour l"element d"amplification (AMP). En outre, une bobine (LB) dans un circuit de resonance parallele (CB, LB) au filtre (BPF) et un condensateur (cA) dans un circuit de resonance en serie (CA, LA) avec le filtre sont composes respectivement d"un transformateur elevateur et la resistance de capacite d"une antenne capacitive, ameliorant ainsi le rapport signal-bruit. L"amplificateur est utilise dans le premier etage de haute frequence d"un recepteur radio.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)