SU1636986A1 - Monostable multivibrator - Google Patents

Abstract

The invention relates to a pulse technique, namely, relaxation devices. The aim of the invention is to expand the functionality. The device contains the first 1 and second 2 logical elements OR NOT, the capacitor 3 and the resistor 4. The introduction of the resistor 5 and the key 6 makes it possible to generate pulses whose duration is equal to the sum of the duration of the input signal and the duration of its exposure. 2 Il.

Description

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eight

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The invention relates to a pulse technique, namely, relaxation devices.

The purpose of the invention is the extension of the functionality of the one-shot; this is achieved by introducing into the one-shot an additional resistor connected between the time of the driving capacitor and the combined inputs of the second logic element, and a key whose control input becomes the second control input of the single-oscillator; of the logic element and to the earth bus of the one-shot.

Fig. 1 is a schematic diagram of a one-shot; Figure 2 shows the stress plots at characteristic points of the one-shot that explain its operation.

A single-vibration consists of an OR-NOT 1 logic element, an OR-NOT 2 logic element, a capacitor 3, a resistor 4, a resistor 5, and a key 6. The control inputs of the one-vibrator are the first input 7 of the OR NE-1 logic element and the control input 8 of the key 6. The second input of the logical element OR-NOT 1 is connected to the output of the element 2, which is the output 10 of the one-shot. The output 9 of the logic element 1 is connected to the first output of the capacitor 3, the second output of which is connected to the first terminals of resistors 4 and 5. The second output of resistor 4 is connected to the power bus of the single vibrator, and the second output of resistor 5 to the combined inputs of the logic element 2 and to the first output key 6, the second output of which is connected to the Earth single-vibration bus.

The single vibrator works as follows.

Let the input 7 received a signal allowing the operation of the one-shot.

If there is no signal at the output 8, then the OR-NOT 1 logical element is transferred from the logical 2 state to the logical 0 state, the capacitor 3 starts charging through the resistor 4 from the one-time power source with a constant time t defined by the capacitor 3 and a resistor 4. At the same time, a potential jump occurs from the state of logical 1 to the logical O state at the input of the element OR-NOT 2, which leads to the switching of the logical element OR of the output state from the logical state O to the logical 1 state. Starts The formation of the output pulse. When the potential at the input element OR-NOT 2 due to the charge of the capacitor

3 threshold voltage Vnop of an OR-NOT 2 logical element it switches to the state of logical O, which leads to switching of the logical element OR-NOT 1 to the state of logical 1. This completes the formation of youIn2

impulse duration Tov t

If, simultaneously with the trigger pulse at input 7, input impulse Tx also arrives at input 8, then the operation of a single vibrator occurs differently. Logic elements OR NOT 1 and 2

switches from the initial states and O to the O state, respectively. However, the charge of the capacitor 3 through the resistor 4 does not occur, since the potential at the input of the logical element OR NOT 2 is fixed by the switch 6 at a level close to the logical O. The indicated state of the single vibrator continues for the duration Tx of the pulse at the control input 8 After the end of the indicated pulse, the operation continues as in the usual formation of the output pulse: the charge of the capacitor 3 through the resistor 4 from the single-source power source starts at the same time constant m, which lasts for as long as the potential at the input of the element OR NOT 2 does not reach the threshold value Vnop. Logic elements 1 and 2 are returned to the initial state; now its duration is equal to the sum of the durations Tvx of the signal at the control input 8 and the duration T o the exposure of the one-shot 8.

The resistor 5 is included in the one-shot to improve the efficiency of the device, since the key current 6 in the on state is inversely proportional to the sum of the resistance values of the resistors 4 and 5. The resistor 4 is the time setting, therefore, increasing it to the required values

not always possible. The required reduction in the current of the switch 6 in the on state is thus provided by a resistor 5.

A single vibrator allows to form

After each signal at the control input 8, a pulse with a fixed duration, not depending on the arrival times of these signals, or on their relative position in time. Specified

the property allows it to be used in various time blocking devices operating under conditions of strong nondeterministic time interference.

Claims (1)

A single vibrator allows the formation of pulses whose duration is equal to the sum of the duration of the input signal and the duration of its exposure, which significantly expands its functionality. Claims of the invention: A single-oscillator comprising two logical elements 2IL-NOT, a capacitor and a resistor, the first input of the first logic element 2IL-NOT being the control input, the second input connected to the output of the second logic element 2IL-NOT, which is the output of the single-oscillator, the output of the first the logic element 2ILI is NOT connected to the first output of the capacitor, the second output of which is connected to the first output of the resistor and 0 with the interconnected inputs of the second logical element 2ILI — NOT, and the second terminal of the resistor is connected to the power bus of one vibrator, characterized in that, in order to expand its functionality, it is equipped with an additional resistor connected between the connection point of the capacitor and the resistor and the connected inputs of the second logical element 2 or not. and a key whose control input is the second control input of the one-vibrator, and the outputs of the key are connected to the interconnected inputs of the second logic element 2OR-NE and to the bus of the Earth one-shot. 2