SU1354395A2 - Multivibrator - Google Patents

Abstract

The invention relates to a pulse technique and can be used in automation and computing devices as a controlled clock generator. The purpose of the invention is the expansion of functional capabilities achieved by introducing a match element 2I 4 into the multivibrator. In addition, the multivibrator contains a counting trigger 1, the first 2 and second 3 delay elements, an input bus 5, a control bus 6. The introduction of the coincidence element 2I with connecting its inputs, as shown in the diagram, allows, by varying the duration of the control pulse, control the number of output pulses and ensures that the duration of the last output pulse is maintained at the end of the charging L guide pulse in the time of generating an output that extends the functionality of the multivibrator. 2 Il. With S (L 00 CL 4 ;: 00 with SP 14) Figure 1

Description

The invention relates to a pulse technique, can be used in automation devices, computer technology as a controlled clock signal generator and is an improvement of the invention according to the author. No. 1164866.

The purpose of the invention is to expand the functionality by controlling the number of output pulses and preserving the duration of the last output pulse at the end of the control pulse at the time of generating the output pulse by introducing a 2I matching element, one input of which is connected to the control bus.

Figure 1 shows an electrical functional scheme of the multivibrator; figure 2 - timing charts of the multivibrator ..

Figure 2 marked: a - trigger signal; b - potential at the direct output of the counting trigger; в - potential at the inverse output of the counting trigger; g is the potential at the output of the second delay element;

d - potential at the output of the first delay element; e - potential on

the output of the match element 2 and 4; W - control signal.

The multivibrator contains counting trigger 1, first 2 and second 3 delay elements, match 2I 4, input bus 5 and control pin 6. Direct output of counting trigger 1 through the first delay element 2 and match 2I 4 is connected to its counting input. The inverse output of the counting trigger 1 through the second delay element 3 is connected to its R-input. The input bus 5 is connected to the S-input of the counting trigger 1, and the control bus is connected to the input of the match element 2 and 4.

As the counting trigger 1 used D-trigger, in which the inverse output is connected to the D-input

In the initial state, the trigger signal on the input bus 5 and the control signal on the control bus 6 are missing. At the direct output of the counting trigger, the output of the first delay element 2 and the output of the coincidence element 2 and 4 there are zero levels, and at the inverse output of the counting trigger 1 and the triggering of the second delay element 3 - unit levels.

To put the multivibrator into self-oscillation mode, it is necessary to send a control signal to bus 6 (figure 2) and a trigger signal to bus 5 (figure 2 a), which, spreading along the chains of the counting trigger 1, sets the latter to single state (fig.2 biv). The zero potential at the inverse output of the counting trigger 1 (Fig. 2c), acting through the second delay element 3 (Fig. 2 g) at its stable R input, re-translates the counting trigger 1 to the initial state (Fig. 2 b and c) with a delay equal to the signal propagation time through the elements of the counting trigger 1 and the second delay element 3.

0 Thus, from the direct output of the counting trigger 1, a pulse is removed with a duration equal to the total delay of the second delay element 3 and the response time of the counting trigger i. The impulse of the direct output of the counting trigger 1 (Fig. 2 b), the passage through the first delay element (Fig. 2 d) and the coincidence element 2 and 4 (Fig. 2 e), d €; it is connected to the counting input of the counting trigger 1 and reverses its state. In this case, the R-input of the counting trigger 1 again receives a zero potential after a time equal to the delay of the second

5 elements 3 delays. Consequently, the multivibrator goes into self-oscillation mode, and the counting trigger I operates in the standby mode due to the delay elements.

0

To stop the self-oscillations, it is necessary to remove the control signal on the bus 6 (Fig. 2 g). The removal of the control signal is shown at the moment when

g the unit level is present at the forward output of the counting trigger 1. and the outputs of the first delay element 2 and the coincidence element 2 and 4 (fig.2 b, e and e), i.e. at the moment when the formation of the last pulse at the outputs of the counting trigger is not completed. At the moment of termination of the control signal at the output of the coincidence element 2 and 4, a zero level is formed (Fig. 2e). At the same time, at the outputs of the counting trigger, the formation of the last pulse ends. First, the first delay element 2 is returned to its initial state (Fig. 2 d), then the counting one.

0

five

trigger 1 (Fig.2 biv) and the second element 3 delay.

To switch back to self-oscillation mode, you need to repeat the process. By supplying control signals of different duration to pin 6, it is possible to control the number of output pulses of the controlled multivibrator in the whole range of integers.

The duration of the control pulse can be determined from the dependence

(N-l) .T tjjn N-T,

where N is the number of pulses provided by the multivibrator; T is the period of the generated sequence of the multivibrator; control pulse duration. The multivibrator can work as a single vibrator. In this case, no control signal is sent to bus 6. The match element 2 and 4 is blocked. On the trigger signal at the outputs of the counting trigger 1 and the delay elements 3 and 2, single pulses are generated.

The pulse duration is determined by the formula

V% t, + t.

t, is the delay time of the first delay element; tj is the delay time of the counting trigger.

Thus, the introduction into the device of the element of the match 2I. with under-; connecting its inputs to the output of the first

the delay element and to the control bus, and the output to the counting input of the counting trigger allows for. by changing the duration of the control pulse, control the number of output pulses and ensure that the duration of the last output pulse remains at the end of the control pulse at the time of generation of the output pulse, which expands

multivibrator functionality.

Claims (1)

Invention Formula Multivibrator auth.St. . No. 1164866, characterized in that, in order to expand the functionality by controlling the number of output pulses and preserving the duration of the last output pulse when the control pulse ends at the moment of generating the output pulse, coincidence element 2I, the output of which is connected to the counting input of the counting trigger, and the inputs are connected respectively to the control bus and the output of the first delay element.