SU928619A1 - Dynamic element - Google Patents

Description

The invention relates to a pulse technique, in particular, to dynamic elements having two stable states. Dynamic trigger and logic elements are known using & 1 transistors 1, f27. A obtrusive drawback of such elements is the presence of capacitor coupling between the transistors, which increases the dimensions of the elements. The closest to this technical solution is a dynamic element made on the basis of a symmetric static trigger on transistors with a pulse TopHtoM collection of power, also containing two transistors, the collectors of which are connected via resistors to the supply voltage bus, and the bases have different fields. Z. control pulses. The disadvantages of such an element are the need for multiphase power and phase correction when building a computing device on them, 1 also in large The number pa3HO3nehieHTOB and power rails. The aim of the invention is to simplify the dynamic element. This goal is achieved due to the fact that in the ding1mic element containing two transistors, the collector of the first of which is connected via a resistor to the alternating voltage source bus, and the bases of the transistors are connected to the input mines of the source of alternating pulses, sequentially and the counter-emitter junction is connected to a diode, and the emitter of the second transistor connected by a collector to the emitter of the first transistor is connected to the common bus of the device. Figure 1 shows the principle of the NSh electrical circuit of the Dynamic Element; figures 2 and 3 show the output voltage diagrams. The dynamic element contains the first transistor 1 connected by a collector through a resistor 2 with a source 3 of alternating supply voltage, and e} t-: ter - to the collector of the second transistor 4 connected by an emitter with a common bus, diode 5 in the base circuit of transistor 1 The base circuits of transistors 1 and 4 are connected to the input buses 6 and 7, and the emitter and collector of transistor 1 are connected to the buses 8 and 8. 9 respectively. The dynamic element works as follows. In the input state, the input control signals on the input buses B and 7 are absent, and a high-frequency sinusoidal supply voltage is applied to the source 3 bus. In this case, transistor 4 is a significant impedance, being the load in the emitter circuit of transistor 1 | and the transitions of transistor 1 do not have an external bias. The vase of transistor 1 is disconnected by a diode 5 through a constant component, and connected to a collector and an emitter through a variable pn junction capacitance through a variable component. At small amplitudes of the supply voltage (U) due to the asymmetry of the transitions of the drift transistor 1, the current flows through it in the direction from the collector to the emitter. With an increase in the amplitude of the supply voltage (V ,,), the magnitude of this current reaches a maximum value, and then somewhat decreases (Fig. 2), and there comes such a moment that the current through transistor 1 abruptly changes its direction and increases sharply. The output voltage Id on the output bus 9 abruptly changes from a value at point a (Fig. 2) to a value at point b, i.e. from state O to state -1. With a further increase in the amplitude of the supply voltage (and, this direction of current flow is maintained. With a decrease in the amplitude of the voltage, the supply (s), the breakdown B1 "of one voltage does not occur at point b, but at point 6. At the same time, the output voltage The jump changes from the value at point b to the value at point A. The same change in the magnitude of the input voltage Ug occurs on the output bus 8, but there is a transition from the state O to state +1 (FIG. 3). the process of changing the output characteristics is explained by the fact that current component transistor 1 operates in a disconnected base mode and charges accumulate at the base due to the inertia of the capacitance of the collector and emitter pn junctions at high frequency supply voltage. With increasing supply voltage, the voltage of the base transition The emitter becomes higher than the opening threshold of the transistor 1, and it opens slightly. At the same time, the voltage at its base increases even more and the transistor opens abruptly, and the output voltages. the states (from 0 to -1 and 4-1, respectively), the hysteresis of the output characteristics (Fig. 2.3, is explained by the inertia of the capacitance of the pnp transitions of the transistor 1. The transfer of a dynamic element from one state to another is carried out by feeding control of different polarity shtuls on the input buses b and 7. Moreover, to provide the trigger mode. The voltage amplitude of the supply voltage (, U is chosen inside the hystereic zone of the extrinsic characteristic, i.e. in the area aa (Fig.2). The initial steady state corresponds to O. To transfer to steady state 1 (output;} bus 8 - +1 on output bus 9 - -1) a negative impulse comes to the base of transistor 4, the internal resistance of transistor 4 decreases, which leads to an increase the amplitudes of the ac voltage across the electrodes of the transistor 1 and its opening. The output voltages on buses 8 and 9 take on states +1 and -1, which do not change and after the end of the negative pin on the input bus 7. To transfer the device to the state O on the input bus 6, a positive 11-pulse is applied, which locks the transitions transistor 1, as a result of which it is locked, and this state with | is stored after the end of the positive pulse on the input bus 6.

Thus, the dynamic moment performs the function of a trigger, it has direct and inverse outputs. HE contains less than the known devices, the number of rschioelements n is enough to have a high-frequency sinusoidal voltage to power it. By connecting inputs b and 7 diode,: or diode-transistor assemblies, you can implement logical oyratsin or, NOT, I.

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Claims (1)

(547 DYNAMIC ELEMENT containing two transistors, the collector of the first of which is connected through an resistor to the bus of the AC voltage source, and the base of the transistors are connected to the input buses of the source of different-polarity control pulses, characterized in that, in order to simplify the device, the β-circuit of the first transistor a diode is connected sequentially and counterclockwise to the base-emitter ·· junction, and the emitter of the second transistor connected by a collector to the emitter of the first transistor is connected to the device common bus.