SU1622922A1 - Bridge-type ternary flip-flop - Google Patents

Abstract

The invention relates to a pulse technique and can be used in automation devices, telemechanics and computer technology. The purpose of the invention is to increase the reliability of the bridge ternary trigger. The ternary bridge trigger contains four transistors of the first conductivity type, six transistors of the second conductivity type, twelve resistors and six diodes. The introduction of the third, fourth, fifth and sixth diodes and new connections allows to reduce the number of elements included in the ternary bridge trigger, which increases its reliability and simplifies the topology of the integrated design. 1 il.

Description

The invention relates to a pulse technique and can be used in various electronic devices of automation, telemechanics and computer technology.

The purpose of the invention is to increase the reliability of the bridge ternary trigger.

The drawing shows a circuit diagram of a ternary bridge trigger.

The ternary bridge trigger contains the first, second, third, and fourth transistors of the first conductivity type 1,2,3,4, fifth 5. sixth 6, seventh 7, eighth 8, ninth 9 and tenth 10 transistors of the second conductivity type, collectors transistors 1 and 5, 2 and 6 are connected in pairs to each other and connected to the first 11 and second 12 output buses, the emitters of these transistors through the first 13, second 14, third 15 and fourth 16 resistors are connected to their bases, the emitters of transistors 1 and 2 connected to the first power bus 17, and the emitters of the transistors 5 and 6 are connected to the second power supply bus 18, the bases of transistors 3 and 4 and the emitters of transistors 9 and 10 are connected to a common bus, the cathode of the first diode 19 is connected via a fifth resistor 20 to the base of transistor 7 and the collector of transistor 9 and through the sixth resistor 21 - from The base of the transistor 10, which through the seventh resistor 22 is connected to the common bus, the cathode of the second diode 23 is connected through the eighth resistor 24 to the base of the transistor 8 and to the collector of the transistor 10. And through the ninth resistor 25 to the base of the transistor 9. which through the tenth resistor 26 is connected to a common bus.

The anodes of the diodes 19 and 23 are connected respectively to the output tires 11 and 12, between which the first load 27 is turned on, the second 28 and the third load 29 are connected between the output and common buses, the anodes of the third and fourth diodes 30, 31 are connected respectively to the first 32 and second

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33 input trigger buses, and the cathodes, respectively, with the cathodes of diodes 19 and 23, the cathodes of the first 34 and sixth 35 diodes are connected respectively to the bases of transistors 9 and 10, the anodes of these diodes are connected to the third input bus of trigger 36, the bases of transistors 5 and 6 are connected respectively, the collectors of transistors 4 and 3, the emitters of which through the eleventh 37 and twelve 38 resistors are connected to the emitters of transistors 8 and 7, the collectors of which are connected respectively to the bases of transistors 1 and 2.

Bridge ternary trigger works as follows.

Since the trigger circuit is symmetrical, we describe the switching order of the transistors for one half (transistors 2.8.4, 10.5). If transistor 8 opens. It opens transistor 2 with a collector current. At the same time, the emitter current of transistor 8 flows through an emitter junction of transistor 4 (connected to a common base) and almost all is transmitted to the collector junction, opening transistor 5. Thus, opening of transistor 8 results in opening t ranzistory 2.4 and 5. If the open transistor 10, the transistor 8 can not open, because the current of its base is shunted by the open transistor 10. Similarly, the switching of the transistors 1,7,3,6 and 9.

In the first steady state at zero potentials at the inputs 32, 33 and 36 all the transistors of the trigger are closed, at the outputs 11 and 12 are zero potentials, currents in the loads 27-29 are absent.

If the trigger is in the first steady state and a positive pulse arrives at input 32, the current through the resistor 25 opens transistor 9, but the state of transistor 7 does not change as it was closed. The input pulse Gok through the resistor 24 also opens the transistor 8, which leads to the opening of the transistors 2.4 and 5. At the output 12 of the flip-flop, a positive voltage is established, which through the diode 23 and the resistor 24 is transmitted to the base of the transistor 8 and keeps it open after the end of the input pulse. The trigger is set to DO a second steady state. In the load current will flow.

If the trigger is in the first steady state and a positive pulse arrives at the input 33, the transistors 1.7, 10.3 and 6 are similarly opened. The directions of the currents in the loads and the signs of the voltages at the trigger outputs change to opposite (compared to

second steady state). The trigger switches to the third steady state.

If the trigger is in the second state of the fuel and a positive pulse arrives at the input 33, the current through the resistor 20 cannot open the transistor 7, since it is closed through the open transistor 9 to the common bus. Only after

0 as an input current through resistor 21 opens transistor 10 and, therefore, transistors 2,8,4 and 5 close at output 12, a potential is close to zero, the current through the diode 23 and the resistor 25 disappears, and the transistor 9 closes, the current through resistor 20 opens transistor 7.

Transistors 1.7.3 and 6 open. The trigger is set to the third steady state. Due to the described after 0 switching of the transistors (first, the open transistors are closed, then the closed ones are opened), no end-to-end currents arise when the trigger is switched.

5If the trigger is in the third steady state and a positive pulse arrives at input 32, then, similarly, due to the symmetry of the circuit, the device switches to the second steady state.

If the trigger is in the second steady state and a positive pulse arrives at input 36, then transistor 9 opens (transistor 10 remains open). All the transistors of the trigger are closed and it switches to the first steady state,

If the trigger is in the third steady state and to input 36 it enters

0 is a positive pulse, then due to the symmetry of the circuit, in a similar way the trigger switches to the first steady state.

Thus, applying a positive impulse bridge tertiary trigger switches any of the three stable states in an arbitrary order. In this case, the currents, as in a symmetrical load 27, and in asymmetrical loads 28 and 29.

0 can have two different directions and zero.

Compared with the prototype of the proposed device, the number of resistive elements is reduced. This increases the reliability

5, because the total number of elements and it decreases, and hence the number of failures, is reduced. At the same time, reducing the number of resistive elements simplifies the technology of fabrication (simplifies the topology of the device and reduces the area of the crystal),

Claims (1)

Invention Formula The three-way bridge trigger contains the first, second, third, and fourth transistors of the first conductivity type, the fifth, sixth, seventh, eighth, do.th, and tenth transistors of the second type, tipoetoydemy, collectors of the first and second, second, and sixth transistors They are connected in pairs with each other and connected respectively to the first and second front trigger buses, the emitters of these transistors are connected to their bases via the first, second, third, and large resistors, respectively; the emitters of the first and second transistors are connected to peo The power bus, and the emitters of the fifth and sixth transistors are connected to the second power bus, the base of the third and fourth transistors and the emitters of the nine fifth ten transistors are connected to a common bus, the cathode of the first diode is connected to the base of the seventh transistor and the collector of the ninth transistor and through the sixth resistor is connected to the base of the tenth transistor, which through the seventh resistor is connected to the common bus, the cathode of the second diode is connected via the eighth the resistor from the eighth transistor and the collector of the tenth transistor and through the ninth resistor is connected to the base of the first 1pistor, which through the tenth section is connected to the common bus, the anodes of the first and second diodes are connected respectively by the first and second output buses, me the one with which the first load is turned on, the second and third load are included with output and common tires, about t and l with the fact that. with ilie increase the reliability of the ternary bridge trig- icp.i. The third, fourth, and Shrgsoi diodes are introduced into it, the anodes of the third and fourth diodes are connected to the trigger and, respectively, trigger trigger busses, l cathode, respectively. - respectively, the cathodes of the second and first diodes, the cathodes of the fifth and sixth diodes are connected cooTF.ercTBGnno to the bases of the ninth and tenth transistors, the anodes of these diodes are connected to the third input bus of the trigger, the base n t it and the sixth transistors are connected respectively to the fourth collectors and the third transistor, the emitters of which the eleventh and twelfth resistors are connected respectively to the emitters of the eighth and seventh transistors, the collectors of which are connected respectively to the Cases of the second and first transistor in.