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Machine translation
1. (WO1981003727) WIDEBAND TRANSCEIVER WITH EMI SUPPRESSION
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/003727    International Application No.:    PCT/US1981/000752
Publication Date: 24.12.1981 International Filing Date: 05.06.1981
IPC:
H04L 25/12 (2006.01)
Applicants:
Inventors:
Priority Data:
236363 20.02.1981 US
Title (EN) WIDEBAND TRANSCEIVER WITH EMI SUPPRESSION
(FR) EMETTEUR-RECEPTEUR A BANDE LARGE AVEC SUPRESSION EMI
Abstract: front page image
(EN)A transceiver (16) includes an input terminal (18) connected to a short-time-constant differentiator (STD) (20), a Schmitt trigger (22) receiving the output of the STD to produce a corresponding square wave signal, a first driver (24) for supplying the square wave signal to a shielded cable (28), an amplifier (42) for receiving signals from the cable, a second STD (44) between the amplifier and a second Schmitt trigger (48) (producing a corresponding second square wave signal), and a second driver (50) for supplying the second square wave signal to an output terminal (52). Preferably, electromagnetic interference is suppressed by connecting the primary of a bifilar transformer (26) in series between the first driver (24) and the center conductor (30) of the shielded cable, the secondary of the transformer (26) being connected in series between the cable's shield (32) and a floating ground (40) of the transceiver. A bypass capacitor (36) is connected between the shield (32) and the circuit ground (38). An enable circuit (46) is connected between the amplifier (42) and the second Schmitt trigger (48) to enable the Schmitt trigger only when the amplitude of the received signal exceeds a predetermined minimum, which is higher than the threshold of Schmitt trigger (48).
(FR)Un emetteur-recepteur (16) possede une borne d'entree (18) connectee a un differenciateur a constante de temps courte STD (20), une bascule electronique de Schmitt (22) recevant la sortie du STD pour produire un signal d'ondes carrees correspondant, un premier circuit de commande (24) pour envoyer le signal d'ondes carrees a un cable blinde (28), un amplificateur (42) de reception des signaux arrivant par le cable, un second STD (44) entre l'amplificateur et une seconde bascule electronique de Schmitt (48) (produisant un second signal d'ondes carrees correspondant), et un second circuit de commande (50) pour envoyer le second signal d'ondes carrees a une borne de sortie (52). De preference, l'interference electromagnetique est supprimee en connectant le primaire d'un transformateur bifilaire (26) en serie entre le premier circuit d'entrainement (24) et le conducteur central (30) du cable blinde, le secondaire du transformateur (26) etant connecte en serie entre le blindage (32) du cable et une terre flottante (40) de l'emetteur-recepteur. Un condensateur de shunt (36) est connecte entre le blindage (32) et la terre du circuit (38). Un circuit de validation (46) est connecte entre l'amplificateur (42) et la seconde bascule electronique Schmitt (48) pour valider la bascule electronique Schmitt seulement lorsque l'amplitude du signal recu depasse un minimum predetermine, superieur au seuil de la bascule electronique Schmitt (48).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)