摘要:
A logic circuit output stage includes a first transistor with a first terminal that receives the first logic output signal and a third terminal coupled to a first output node. A second transistor has a first terminal coupled to the first terminal of the first transistor. A third transistor has a first terminal that receives the second logic output signal and a third terminal coupled to a second output node. A fourth transistor has a first terminal coupled to a third terminal of the second transistor and a second terminal coupled to the second output node. An impedance is connected between the third terminal of the second transistor and the first output node. In this output stage, the second transistor provides a transient signal to the first terminal of the fourth transistor in response to a transition in the first logic output signal. The fourth transistor provides a temporary change in the current flowing through the second output node in response to the transient signal received from the second transistor. The temporary current change provided by the fourth transistor allows faster charging or discharging of capacitive loads on the second output node, thereby producing a faster output slew rate. Moreover, the faster output slew rate is produced without significantly increasing either the integrate circuit chip area or the power consumed by the output stage.
摘要:
A current-switching type compound semiconductor logic circuit which is high in an operating speed and low in power consumption. Voltage stabilizing transistors (25,26) are provided to the logic circuit so that voltage signal which are in-phase with the gates of driving transistors (21,22) and has a mean electric potential higher than that of the same by a predetermined value is applied to the gate thereof. The voltage stabilizing transistors (25,26) act as a buffer to prevent electric potential of the driving transistors (21,22) from fluctuating. As a result, it is possible to secure stable outputs in which the distortion of a waveform or the fluctuation of a cross point due to a jitter is hardly generated.
摘要:
A logic circuit includes a pair of transistors formed by junction type or Schottky barrier type field effect transistors (Q,, Q 2 ), a constant current electric source (Q 3 ) connected to a common source terminal of the field effect transistor (Q 1 ,Q 2 ), and a pair of load elements (R 1 , R 2 ) respectively connected between each drain terminal of the field effect transistors (Q 1 , Q 2 ) and an electric source (V DD ). A clamp circuit (D 1 ,D 2 ) is connected between the drain terminals of the pair of field effect transistors.
摘要:
A delay circuit (14) of the type having current tree (60) for selectively applying a current source (66) to either a first (62) or a second (64) circuit node in response to the state of an input signal (Vin), the circuit nodes being resistively coupled (76, 78) to a first voltage source (Vdd) and providing an output signal (V3, V4) delayed from the input signal according to a delay response, the delay circuit being characterized by: a first capacitance circuit (102, 108, 120) coupled between a second variable magnitude voltage source (Vc) and the first circuit node; and a second capacitance circuit (100, 104, 118) coupled between the second variable magnitude voltage source and the second circuit node, the capacitances of the first and second capacitance circuits varying according to the magnitude of the second variable magnitude voltage source, the first and second capacitance circuits determining the delay response for the delay circuit.
摘要:
Un circuit d'unité logique à transistors à effet de champ couplés à une source de rétro-action comporte une tension de référence interne fournie par la sortie de l'un des transistors à effet de champ d'une paire de transistors à effet de champ, connectés via un transistor à effet de champ suiveur de source à l'entrée de l'autre transistor à effet de champ de la paire. Les circuits d'une unité logique couplée à une source de rétro-action présente par rapport aux circuits des unités logiques à transistors à effet de champ couplées à une source connues des avantages dus à une densité supérieure de fonctions pour une surface donnée de circuits intégrés, une dérivation de tension inférieure lors de changements de température, un gain de tension supérieur, une marge de bruit supérieure et une charge de sortance supérieure. La sortie de l'un des transistors à effet de champ est connectée via un transistor à effet de champ suiveur de source à l'entrée de l'autre transistor à effet de champ de la paire.
摘要:
Dispositif semiconducteur du type réseau de portes élémentaires prédiffusé pour constituer un circuit intégré dit circuit à la demande, réalisé selon une technologie de circuit intégré sur arséniure de gallium, caractérisé en ce que les portes élémentaires qui contituent les éléments du réseau prédiffusé réalisent les fonctions OU/NON-OU en logique dite SCFL et constituent à la fois des portes internes (PI) pour le circuit à la demande et des portes externes (PE) compatibles avec la logique dite ECL pour connecter directement le circuit ainsi formé à un dispositif semiconducteur extérieur réalisé dans ladite logique ECL. Aoolication : Fabrication de "circuits à la demande" ultra-ultrarapides réalisés sur arséniure de gàllium, en outre compatibles avec les circuits ECL.
摘要:
A gallium arsenide integrate circuit device having compatibility with a silicon emitter-coupled logic device is disclosed. the gallium arsenide integrated circuit device includes a plurality of transistors constituting a logic circuit and an output transistor driving an externally provided load in response to an output of the logic circuit. The output transistor has its threshold voltage that is larger in absolute value than the threshold voltages of the remaining transistor, so that an output signal having the ECL level is produced without sacrificing a power consumption and a semiconductor chip area.
摘要:
A source follower current steering logic circuit useful in, for example, fabricating digital integrated logic circuits using gallium arsenide and current mode logic switches. The circuit includes an input logic network which includes level shifting networks to generate output signals having assertion levels of different voltage levels and a reference voltage logic network having a similar level shifting network for generating reference voltages relative to the voltage levels of the assertion levels of the output signals from the input logic network. A logic tree includes current mode logic switches for receiving the output signals from the input logic network and the reference voltage generating network to perform selected logic operations the output signals. The output signals are taken from the logic tree. A top load clamps the output signals to selected voltage levels.