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1. WO1992016998 - FAST TRANSMISSION GATE SWITCH

Publication Number WO/1992/016998
Publication Date 01.10.1992
International Application No. PCT/US1992/002168
International Filing Date 17.03.1992
Chapter 2 Demand Filed 16.10.1992
IPC
H03K 17/041 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and -breaking
04Modifications for accelerating switching
041without feedback from the output circuit to the control circuit
H03K 17/693 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and -breaking
51characterised by the use of specified components
56by the use, as active elements, of semiconductor devices
687the devices being field-effect transistors
693Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors
CPC
H03K 17/04106
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and –breaking
04Modifications for accelerating switching
041without feedback from the output circuit to the control circuit
04106in field-effect transistor switches
H03K 17/04113
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and –breaking
04Modifications for accelerating switching
041without feedback from the output circuit to the control circuit
04113in bipolar transistor switches
H03K 17/693
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and –breaking
51characterised by the components used
56by the use, as active elements, of semiconductor devices
687the devices being field-effect transistors
693Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors
Applicants
  • QUALITY SEMICONDUCTOR, INC. [US]/[US] (AllExceptUS)
  • WYLAND, David, C. [US]/[US] (UsOnly)
Inventors
  • WYLAND, David, C.
Agents
  • HSUE, James, S.
Priority Data
672,05018.03.1991US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FAST TRANSMISSION GATE SWITCH
(FR) COMMUTATEUR A GRILLE DE TRANSMISSION RAPIDE
Abstract
(EN)
A fast switching device for passing or blocking signals between two input/output ports includes a transistor (102) having a first and second terminal and a control terminal. The first and second terminals are connected between the two ports. The transistor passes signals between the ports when the transistor is turned on and blocks the passage of signals between the ports when the transistor is turned off. When a signal is passed between the two ports, it experiences an internal resistance of the switch, Ri, an internal capacitance of the switch when it is turned on, Ci, and an external capacitance such as bus capacitance Cb. The combination of the resistance Ri with the capacitances (Ci+Cb) cause a delay to the signal approximately equal to the time constant Ri (Ci+Cb). Embodiments of the device provide for total delay Ri (Ci+Cb) caused by the device to be less than the delay caused by a typical logic buffer, e.g., 6.5 nanoseconds for a 74F244, allowing this device to replace logic buffers as communication devices as a means of reducing signal delay. The device further includes a driver (104) for controlling the control terminal of the transistor for turning it on or off. Embodiments of the device provide for turning on and off times of the transistor comparable to that of a typical buffer, e.g., less than 7 nanoseconds for a 74F244.
(FR)
Dispositif de commutation rapide laissant passer ou bloquant des signaux entre deux points d'accès d'entrée-sortie, et comprenant un transistor (102) possédant une première et une deuxième borne et une borne de commande. Les première et deuxième bornes sont reliées entre les deux points d'accès. Le transistor laisse circuler les signaux entre les points d'accès lorsqu'il est activé et bloque le passage des signaux entre les points d'accès lorsqu'il est désactivé. Lorsqu'un signal circule entre les deux points d'accès, il subit l'effet d'une résistance interne du commutateur, Ri, d'une capacitance interne du commutateur lorsqu'il est activé, Ci, et d'une capacitance externe telle que la capacitance de bus Cb. La combinaison de la résistance Ri avec les capacitances (Ci+Cb) provoque un retard du signal approximativement égal à la constante de temps Ri (Ci+Cb). Dans tous ses modes d'exécution, le dispositif présente un retard global Ri (Ci+Cb) inférieur au retard provoqué par un tampon logique classique, par exemple 6,5 nanosecondes pour un 74F244, ce qui permet de l'utiliser à la place des tampons logiques dans des dispositifs de communication afin de réduire le retard des signaux. Le dispositif comprend en outre un pilote (104) qui gère la borne de commande du transistor afin de l'activer ou de le désactiver. Des variantes du dispositif permettent d'atteindre des temps d'activation et de désactivation du transistor comparables à ceux d'un tampon classique, par exemple inférieurs à 7 nanosecondes pour un 74F244.
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