摘要:
Dans la microplaquette émettrice, les bits sont sérialisés et appliqués à un codeur dans lequel le train de bits (D) et son complément ( D ) sont transformés en deux signaux (PH1 et PH2) sous contrôle d'un signal d'horloge en dents de scie CK'. Les signaux (PH1 et PH2) sont envoyés à la microplaquette réceptrice, les signaux (PH1 et PH2) sont appliqués à un décodeur qui engendre deux signaux ( DJ ) et (DK) représentatifs des bits de données et un signal d'horloge CLK reconstitué. Les trois signaux ( DJ , DK et CLK) ainsi qu'un signal de trame (F) sont utilisés par un circuit de conversion et de démultiplexage pour retrouver les multiplets de bits de données parallèles.
摘要:
1. A circuit for performing a basic logic function from n input signals (A, B...) of the type including n input low-barrier Schottky-diodes (D1-Dn) having first electrodes, each of which receives one of said n input signals, and second electrodes connected to a common node connected through a first resistor to a first supply voltage, and comprising : an input transistor (T1) the base of which is connected to said common node, the collector of which is connected through a second implanted resistor to the first supply voltage, and the emitter of which being able to be connected to a reference voltage the value of which is equel to the low level of the input signal in order to provide a circuit well protected against noise or able to receive an additional input signal X when the noise protection is not critical, a first output inverter transistor (T2) the base of which is connected to the collector of said first input transistor, the emitter of which is connected to a second supply voltage and the collector of which is connected through a third implanted resistor to the first supply voltage, whereby the output level at the collector of said output transistor represents the logic function (A.B.C) or ~X (A.B...) according as the input transistor emitter is connected to the reference voltage or receives the additional input signal.
摘要:
Circuit de décodage et de sélection de ligne de mot (WLj) d'un ensemble de mémoire comprenant une matrice de cellules (CEL). A chaque ligne de mot telle que (WLO) est associé un transistor d'attaque (TO 1) et un transistor de contrôle (TO 2) dont le courant collecteur est défini par un transistor (T1) monté en miroir de courant contrôlable (T5, R32). Lorsque la ligne WLO est sélectionnée, le signal de sortie d'un décodeur d'adresse fait que le courant collecteur du transistor (TO 2) passe dans le transistor d'attaque et le rend conducteur. Application à la sélection des lignes de mot dans une mémoire du type à accès aléatoire ou d'une mémoire morte.
摘要:
Duplicated circuit arrangement comprising a main processor (30) and its P bit data bus (44), and two identical redundant devices (21 ; 22), each device is comprised of a processing element (23 ; 35) performing the same task in parallel on a P bits word, and send/receive circuits (24,25;36,37) controlled by the main processor through lines (SR11 to SR22) to transmit said word to and from said main processor. For each device, the send/receive circuits are split into two parts. Send/receive circuit of the first device (21) is split in two parts (24, 25); the first part (24) handles the P/2 Most Significant Bits (MSB's) and the second part (25) handles the P/2 Less Significant Bits (LSB's). In normal operation, during the transmission step, only the first part (24) is allowed to send bits on one half (33) of the data bus (44). Symmetrically send/receive circuit of the second device (22), is also split in two parts (36, 37); the first section (36) handles the P/2 Most Significant bits (MSB's) and the second part (37) handles the P/2 Less Significant Bits (LSB's); only the second part (37) is allowed to send bits on the other half (34) of the data bus (44). Therefore, the data bus driving effort is equally shared between the two devices, the maximum number of simultaneous switching is P/2 for each device. This reduction allows greater transmission speed on large busses.
摘要:
According to the present invention, a CMOS interface circuit (C2) similar to a latch made by two CMOS cross coupled inverters (INV1, INV2) is placed directly on the output node (14) of conventional BICMOS logic circuit (11) operating alone in a partial swing mode. This latch is made of four FETs P5, P6, N8, N9 cross-coupled in a conventional way with the feedback loop connected to said output node (14) The partial voltage swing (VBE to VH-VBE) naturally given by the output bipolar transistors (T1, T2) mounted in an push pull configuration is reinforced to full swing (GND to VH) by the latch at the end of each transition The state of the output node is forced by the latch because of the high driving capability due to the presence of said output bipolar transistors (T1, T2). As a result, the improved BICMOS logic circuit (D2) has an output signal (S) that ranges within the desired full swing voltage at the output terminal (15). It is a characteristic of this embodiment that the structure of CMOS interface circuit (C2) is always independent of the logic function implemented in the conventional BICMOS logic circuit (11). More generally, the CMOS interface circuit may have various physical implementations, however, it is always comprised of CMOS FETs and it becomes active at least in one of the GND to VBE or (VH - BE) to VH range.
摘要:
A high speed high sensitivity receiver comprising a latch (11) between ground and a strobe signal which provides its power supply and a controlled gating circuit (12) comprised of two transmission gates (TG1, TG2). One (TG1) is connected to the line input signal IN the other (TG2) is connected to a reference voltage REF. Supply of the latch and turning on/of of the gating device are activated by STOBE and signals. Assuming the strobe is at a low level, e.g. at the ground potential, no current is supplied to the latch composed of four transistors (T1,T2,T3,T4), but the transmission gates (TG1 and TG2) are on, connecting OUTC to REF and OUT to IN. A latching operation between the cross coupled transistors (T1,T2,T3,T4) is started as soon as the strobe is pulled up. The latching operation is then completed when transmission gates (TG1 and TG2) are turned off (after a transit time of the strobe through the inverter T5/T6). The final state depends on the initial condition found on OUT (node A) and OUTC (node B). T1 turns on first, if IN and OUT are lower than REF and OUTC, and vice-versa. The nodes A and B are pulled quickly to the levels defined by REF and IN when the strobe is switched down, since the latch supply voltage is suppressed and transmission gates (TG1 and TG2) being turned on.