Abstract:
Semiconductor power devices of improved RBSOA and turn-on switching time for use with inductive as well as resistive loads. The emitter (9) of a power transistor has the form of a substantially closed ring of small cross section but great peripheral length, folded into a tortuous configuration so that emitter metallization (12) on the enclosed area can provide low series resistance. In a preferred embodiment the emitter (9) takes the form of the perimeter of a double sided comb with emitter finger regions (23) protruding away from a central spine (8). Improved RBSOA and turn-off times are achieved by the specified emitter geometry and the given width ratios for emitter (10 and 22), base (25 and 26) and metal (24). These ratios permit the device to be scaled to other overall dimensions.
Abstract:
Une unite arithmetique et logique statique a CMOS est capable de selectionner un operande a partir d'une pluralite d'entrees (DBn, (Alpha)DBn, (Alpha)DBn+1, (Alpha)DBn-1) et peut executer plusieurs operations arithmetiques et logiques en plus des operations de decalage vers la gauche et vers la droite. L'unite arithmetique et logique utilise des portes OR exclusif (43-46, 53-54) possedant un nombre minimal de transistors. En outre, on utilise davantage de transistors a canal N que de transistors a canal P ce qui permet d'obtenir une taille reduite et une vitesse de fonctionnement accrue. L'unite arithmetique et logique possede en outre une cellule de memoire a acces selectif (61, 62) servant de stockage temporaire et pouvant commander le bus de donnees de l'unite arithmetique et logique (14, 15).
Abstract:
Un circuit de detection de boucle (18, 20, 22, 24, 54, 56) est couple entre un circuit hybride integre (10) qui fournit une conversion de signaux entre une paire de chemins de transmission unidirectionnels (RX, TX) et une boucle bidirectionnelle d'abonne (T,R). Le circuit de detection de boucle comprend des resistances de protection respectives (20, 22) couplees en paralleles avec une premiere et une seconde resistance de detection (18, 24) entre les bornes du circuit hybride et les bornes de la boucle de l'abonne pour etablir un passage de courant continu entre la boucle bidirectionnelle de l'abonne et le circuit hybride.
Abstract:
Detector monitoring the function of the stator and rectifying diodes in a multiphase alternator battery charging system (20). A circuit combines individual phase signals form the alternator (22) to form an artificial neutral at which a normally symmetric wave signal is present. A first comparison means detects deviations in the normally symmetric wave signal greater in value than a first threshold voltage level. A second comparison means detects deviations in the normally symmetric wave signal lesser than a second threshold voltage level. Means coupled to the first and second comparators produce an output signal whenever the normally symmetric wave signal deviates above the first threshold voltage level or below the second threshold voltage level. The detection of asymmetry in the normally symmetric wave signal indicates a fault in the stator or rectifying diodes of the alternator.
Abstract:
Detector (94) monitoring the operational status of the field coil circuit in a multiphase alternator (22) and voltage regulator battery charging system. Circuit means (94) monitor a first signal at a first terminal (At) of the field coil circuit. Means (246) generate sampling intervals on a repetitive basis. Circuit means (246) interrupt the excitation signal supplied to the field coil by the voltage regulator during the sampling intervals. A second signal is measured during sampling intervals at a second terminal (field) of the field coil circuit. Comparator means (616) compare the first and second signals and produce an output signal when the comparison varies from a predetermined value.
Abstract:
Quiet row select circuit for holding unselected word lines or row select lines in a memory array at a predetermined voltage potential. Transistors (34), (35), (36), (37) are used to couple each row select line (R0), (R2), (R3) to the predetermined voltage potential wherein for adjacent row select lines at least one of the adjacent select lines is always coupled to the predetermined voltage when in an unselected state. A transistor (31) or (32) is also used to couple each of the adjacent row select lines together and this transistor is enabled whenever the adjacent row select lines are non-selected so that both row select lines are coupled together to the predetermined voltage level.
Abstract:
A current source (30) which provides multiple output currents having magnitudes which are of a predetermined ratio of the magnitude of an input current supplied to the current source. The current source includes an input transistor (14) and at least two output transistors (12, 16). The emitters and bases of the input and two output transistors are connected in common with the emitters thereof being connected to a terminal (18) at which is supplied a source of operating potential. The collectors are respectively coupled to individual utilization means. First and second additional transistors (32, 34) are provided having symmetrical structures with the bases thereof being connected to the bases of the output transistors and their emitters connected to the collector of the first output transistor (16). The collectors of the two output transistors are connected respectively to the collector of the input transistor and the collector of the second output transistor (12) whereby all of any saturation current produced by the first output transistor becoming saturated is equally conducted between the two additional transistors to maintain the ratio of input and output currents.
Abstract:
In a shared contact electrically programmable read only memory, decoding circuitry is provided to prevent unwanted device programming due to sneak paths to ground. A two input NAND gate (15, 16) is coupled between adjacent column select lines. If either of the adjacent column select lines are energized, a data line will be enabled. Thus, for each column line energized, only two data lines will be enabled and only one of these will carry a voltage for enabling a memory device.
Abstract:
Procede de purification de trichlorosilane et d'autres materiaux de base de silicium. Des impuretes sous forme de traces de bore et de phosphore sont extraites du trichlorosilane (30) en faisant reagir de faibles quantites d'oxygene (42) avec le trichlorosilane a une temperature comprise entre 170 et 300 C. L'oxygene reagit avec la liaison Si-H dans le HSiCl3 pour former une espece 'SiOH' qui complexe a son tour les impuretes telles que le BCl3 ou le PCl3 presentes dans le trichlorosilane. La purification du trichlorosilane est alors accomplie aisement pendant une etape successive de distillation (46) qui separe le trichlorosilane purifie des composes complexes de phosphore ou de bore qui sont moins volatiles.
Abstract:
Un amplificateur operationnel (18) est capable d'effectuer selectivement une variete de fonctions de circuits. Un amplificateur operationnel simple (18) utilise des condensateurs commutes (24, 32 et 36) pour echantillonner-bloquer un signal d'entree VIN pour etablir un pole de basse frequence, pour appliquer l'echantillon sur une capacitance de sortie (47 et 48) et charger la capacitance, et pour comparer le signal d'entree VIN a une reference VAG. Le circuit a multi-fonctions (12) permet une grande conservation dans la zone circuit ainsi qu'une versatilite des applications de circuit. Un mode de realisation de l'invention consiste a utiliser un convertisseur numerique/analogique de compression-extension (14) ayant un condensateur qui peut etre utilise comme capacitance de sortie (47 et 48) du circuit de l'amplificateur operationnel (12). Le convertisseur numerique/analogique utilise un convertisseur numerique/analogique a echelle R (52) couple directement a un convertisseur numerique/analogique C (50) et possede une structure de commutation qui est plus simple que les circuits comparables de l'art anterieur. Le convertisseur numerique/analogique (14) est asynchrone et possede une capacite programmable de conversion MIC suivant les lois A- et Mu-225. Un circuit filtre de reception de l'amplificateur operationnel (16) est couple directement au convertisseur numerique/analogique C (50), lequel circuit utilise le convertisseur numerique/analogique C (50) comme condensateur d'entree, eliminant ainsi le besoin d'utiliser un amplificateur tampon et permettant au convertisseur numerique/analogique (14) d'etre utilise a la fois pour la conversion analogique/numerique et la conversion numerique/analogique.