SU788349A1

SU788349A1 - Single-shot multivibrator

Info

Publication number: SU788349A1
Application number: SU782588118A
Authority: SU
Inventors: Вячеслав Николаевич Козубов
Original assignee: Предприятие П/Я Р-6707
Priority date: 1978-03-07
Filing date: 1978-03-07
Publication date: 1980-12-15

Description

(54) ОДНОВИБРАТОР(54) SINGLE VIBRATOR

Г R

II

Изобретение относитс к импульсной технике и может быть использовано в электронной , измерительной, вычислительной технике , автоматике.The invention relates to a pulse technique and can be used in electronic, measuring, computing, automation.

Известен одновибратор, содержащий триггер, врем задающую RC-цепь 1.Known one-shot containing the trigger, the time specifies the RC circuit 1.

В известном устройстве регулирование длительности импульса ограничено габаритными размерами и величиной емкости конденсатора , определенной заданным временем перезар да или времени восстановлени заднего фронта импульса, который увеличиваетс с увеличением емкости конденсатора врем задающей цепи. Кроме того, при повышении длительности запускающего импульса относительно длительности импульса одновибратора, ввиду отсутстви положительной обратной св зи, длительность заднего фронта возрастает еще более.In the known device, the control of the pulse duration is limited by the overall dimensions and the capacitance of the capacitor, determined by the specified recharge time or recovery time of the falling edge of the pulse, which increases with increasing capacitance of the capacitor, the driver circuit time. In addition, with an increase in the duration of the triggering pulse relative to the duration of the one-shot pulse, due to the absence of positive feedback, the duration of the falling front increases even more.

Известен одновибратор, содержащий врем задающую цепь, полевой транзистор, элемент И, RS-триггер, шину управлени 2.A one-shot is known, which contains a time master circuit, a field effect transistor, an AND element, an RS flip-flop, a control bus 2.

Известное устройство довольно сложно и имеет недостаточную стабильность выходного импульса.The known device is quite difficult and has insufficient stability of the output pulse.

Цель изобретени - упрощение устройства и повышение стабильности выходного импульса.The purpose of the invention is to simplify the device and increase the stability of the output pulse.

Цель достигаетс тем, что в одновибраторе , содержащем последовательно соединенные врем задающую RC-цепь, обща точка которой соединена с затвором полевого транзистора, сток которого подключен к первому входу элемента И, выход которого подсоединен к первому входу RS-триггера, второй вход которого соединен с щиной 10 управлени , второй вход элемента И соединен с истоком полевого транзистора, с резистором врем задающей RC-цепи и через резистор с общей щиной, причем врем задающий конденсатор соединен с первым выходом RS-триггера, второй вход которого соединен со стоком полевого транзистора.The goal is achieved by the fact that in a single vibrator containing a series-connected time a master RC circuit, the common point of which is connected to the gate of the field-effect transistor, the drain of which is connected to the first input of the And element, the output of which is connected to the first input of the RS flip-flop, the second input of which is connected to control 10, the second input element And is connected to the source of the field-effect transistor, with the resistor of the master RC circuit and through a resistor with a common length, and the time of the master capacitor is connected to the first output of the RS flip-flop, the second input otorrhea is connected to the drain of the FET.

На фит. 1 представлена электрическа схема устройства; на фиг. 2 приведены временные диаграммы, по сн ющие принцип 2Q его работы.On the fit. 1 shows the electrical circuit of the device; in fig. 2 shows time diagrams explaining the principle of 2Q of its work.

Claims

The device contains the valves 1 and 2 RS of the trigger, the valve 3, the field-effect transistor 4, the resistors 5 and 6, the time setting of the capacitor 7. The single-vibration operates as follows. To the initial moment of time to to (Fig. 2 a) of the triggering pulse, the trigger has a state of potentials at the output of the valve 1 (Fig. 26) logical "O, at the output of the valve 2 (Fig. 2 c) logical" 1. The capacitor 7 is connected between the trigger outputs through the gate-drain transition of the field-effect transistor 4 and is charged before the supply voltage, the potential at the junction point of the driving RC circuit and the gate of the field-effect transistor 4 is close to zero (Fig. 2g) At the second output of the valve 3, due to the fact that the first input is triggered by the output of the trigger valve 1, the potential is also close to zero (Fig. 2e), and the output of the valve 3, respectively, has a logical "1 (Fig. 2e). At the time to or ti to the input of the single-oscillator trigger input, valve 1 receives a negative pulse and whether the differential from logical "1 to logical" O, respectively (Fig. 2 a). The trigger changes its state at the outputs (Fig. 2 a, b, c) and the potential on the capacitor 7 at the connection point with the gate of the FET 4 ( Fig. 2 d) is shifted to the negative region by the amount of power supply of the device.The negative potential of the field-effect transistor 4 is closed, however, since the input of the valve 3 is bounded by the resistor 5, its potential also has a logical "1" (Fig. 2 e) and at the output of the one-shot a logical "O" is maintained. The capacitor 7 is charged (Fig. 2 g) through a resistor 6 connected to the input of the gate 3. After the time ti, on the gate of the FET 4 (Fig. 2 g), the drain current and the voltage on the resistor 5 (Fig. 2e) are sufficient to translate the threshold voltage of the valve 3 (Fig. 2e), the potential at the output of the valve 3 from the logical state "1 to the logical" O (Fig. 2e), and the potential at the input of the valve 2, if the logical " 1 (Fig. 2a), due to positive feedback through valve 1, is quickly restored to logical th "1 (Fig. 2fc) T) igger changes its state to the initial state (Fig. 26, c) and the capacitor 7 is again quickly charged through the gate-drain transition of the FET 4. If the input of the one-shot at the time ti is present logical "O (Fig. 2a), then, due to positive feedback, through a capacitor 7 (Fig. 2g) and a field-effect transistor 4, operating in this case in the repeater mode (Fig. 2e), the potential at the one-shot output, valve 2 (FIG. 2 c) also quickly recovers to a logical "1, and the capacitor 7 for a time iz (see Fig. 2 c, d, e) is charged slowly before the logical one" input of the one-vibrator, i.e. the duration of the falling edge of the pulse depends on the duration of the input pulse one-shot. The proposed one-shot has a pulse duration. The time setting resistor 6 can be connected directly to the supply voltage, however, in this case the pulse duration will be T 1.5 RC. The range of adjustment of the output pulse duration in comparison with the known single-oscillators of the same purpose with the same values of the resistor 6 and the capacitor 7 is increased to RC. Claims of the invention: A one-vibration device containing a series-connected time specifies an RC circuit whose common point is connected to a gate of a field-effect transistor, the drain of which is connected to the first input of an AND element whose output is connected to the first input of an RS flip-flop, the second input of which is connected to a control thickness that differs in that, in order to simplify the device and increase the stability of the output pulse, the second input of the element I is connected to the source of the field-effect transistor, the time of the master RC circuit is connected to the source and through the resistor with common o, and the time specifying the capacitor is connected to the first output of the RS flip-flop, the second input of which is connected to the drain of the field-effect transistor. Sources of information taken into account in the examination 1. "Instruments and equipment of the experiment, 1973, No. 4, p. 12.

2. USSR author's certificate number 369686, cl. H 03 K 3/284, 1973 (prototype).