SU1358077A1 - Single pulse shaper - Google Patents

Abstract

The invention relates to a pulse technique and can be used in various radioelectronics. devices for resetting them. The object of the invention is to increase the reliability of operation when the ambient temperature changes. A single pulse shaper contains transistors 1 and 2 of the same conductivity type, transistor 3 of the opposite conductivity type, transistor 13, voltage source 12 and voltage and resistors shown in the drawing. When the shaper operates, the value of the current flowing into the base of transistor 2, the low voltage levels between the power supply buses, is determined by the sum of the resistance of the resistors 7 and 8. When the voltage between the buses reaches the value corresponding to the opening of the transistor 13, the value of the current flowing into the base transistor 2 is increased by the current flowing through resistor 10, the emitter-base transitions of transistor 13 and transistor 2, and also through resistors 6 and 7. Thus, the required load capacity is provided nnogo PFN. 1 il. (L 3 SAE SP 00 about p /; -o

Description

The invention relates to a pulse technique and can be used in various electronic devices for setting them back to their original state.

The aim of the invention is to increase the reliability of operation when the ambient temperature changes.

The drawing shows an electrical schematic diagram of the proposed driver.

A single pulse driver contains a power source, the first 1 and the second 2 transistors, of the same conductivity type, the emitters of which are connected to the first power supply bus, the third transistor 3 of the opposite conductivity type, the first 4, the second 5, the third 6, the fourth 7 and the fifth 8 resistors , the base of the first transistor 1 is connected via the first 4 and second 5 resistors respectively to the collector of the third transistor 3 and the first power supply bus, the collector through the third 6, fourth 7 and fifth 8 resistors to the third base respectively nzistora base of the second transistor 2 and to a second bus of the power supply, the collector of the second transistor 2 is connected to the bus 9 shaper single pulses shee- 10 of the seventh resistor 11, a source 12, a stable voltage and a fourth transistor 13, the collector koto-

35 is connected to its second bus

power supply, the base through the sixth 10 and seventh 11 resistors, respectively, with the second and first power supply buses, the emitter - with the base of the third transistor 3, the emitter of which is connected to the output of the stable voltage source 12, the first and second inputs of which are connected respectively to the second and first tire power source.

A single pulse shaper works in the following 1 way. At the initial rise time of the voltage between the first and second power supply lines, all transistors are closed, and when the voltage between the first and second power supply lines reaches the value of the opening voltage of the second transistor 2,

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the input is transmitted through its output to the emitter of the third transistor 3.

When the supply voltage has not reached such a value at which the voltage applied to the emitter-base transition of the third transistor 3 becomes equal to the opening voltage of the third transistor 3, the latter opens, and the current from its collector through the resistor 4 the second resistor 5 creates a voltage drop across it. When this voltage reaches the value of the opening voltage of the first transistor 1, it opens and shuns the circuit of series-connected resist 7 and the base-emitter junction of the second transistor 2, thereby increasing the current flowing through the resistor 6

the last one opens, the current through the resistor 55 parallel-connected junctions of the collectors 7 and 8 enters the base of the second lecturer-emitter of the fourth transistor 2, opening it and the form 13 and the base-emitter of the third trac on the output bus 9 of the driver Zistor 3. Thus, a signal is formed with a logical zero level, the opening of the first 1 and third 3

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which is used to set and hold down logic devices. With a further increase in the voltage between the first and second power supply lines, the second transistor 2 continues to remain in saturation mode, as the value of the current flowing into its base continues to increase. The increasing current through resistors 10 and 11 creates an increasing voltage drop across resistor 11, upon reaching which a value equal to the sum of the values of the opening voltage of the fourth transistor 13 and the fall, the voltage on the resistor 7 and the open junction emitter-base of the second transistor 2, fourth transistor 13 is opened, passing on through the open junction of the emitter-base of the fourth transistor 13 and the resistor voltage divider made on resistors 10 and II, the voltage increments between the power supply buses to the base of the third transistor 3.

At the output of a stable voltage source 12 relative to its first input, a stable voltage is generated. With an increase in the voltage between the voltages of the power supply source, the entire voltage increment, which exceeds the stable voltage level at the output of the stable voltage source 12

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input is transmitted through its output to the emitter of the third transistor 3.

When the supply voltage has reached-. there is no such value at which the voltage applied to the emitter junction — the base of the third transistor 3 — becomes equal to the opening voltage of the third transistor 3, the latter opens, and the current from its collector flows through the resistor 4 to the second resistor 5, creating voltage drop. When this voltage reaches the opening voltage of the first transistor 1, it opens and shunts the circuit from the series-connected resistor 7 and the base-emitter junction of the second transistor 2, thereby increasing the current flowing through the resistor 6 and

transistors, the collector of the first transistor 1 is set to a logic zero level, and the second transistor 2 is closed.

With a further increase in the voltage between the power supply buses, the first 1, third 3 to fourth 13 transistors remain open, and the second transistor 2 remains closed. When the voltage between the power supply lines decreases, the transition of the second transistor 2 from the closed state to the open state also occurs with a steep decline.

The operation of a single pulse generator at the same required value of the voltage between the power supply buses is ensured by the fact that when the temperature changes, the increment of the voltage drop across the emitter junction - the base of the transistor 3 that determines the voltage value between the source buses the power supply corresponding to the transition of the second transistor 2 to the closed state is compensated by the same increment in the voltage drop across the transition emitter — the base of the fourth transistor 13 in the circuit specifying ie the voltage between the power sources nick tires, - a corresponding transition of the second transistor 2 in the closed condition of the.

The required value of the voltage between the power supply lines at which the second transistor 2 changes from an open to a closed state is determined by selecting the appropriate ratio of the main resistance values of resistors 10 and 11. In this case, the voltage drop across the sixth resistor 10 is equal to the value of a stable voltage at the exit. source 12 stable voltage relative to its first input.

The value of the current flowing into the base of the second transistor 2 for small levels of voltage between the power supply buses is determined by the total resistance of resistors 8 and 7, and when the voltage between the buses reaches the value corresponding to the opening of the fourth transistor 13, the current flowing through to base

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the second transistor 2 is increased by the current flowing through the sixth resistor 10, the emitter junction is the base of the fourth transistor 13, the resistors 6 and 7, and the emitter junction is the base of the second transistor 2. Thus, the required load capacity of the single-pulse former is provided.

A stable voltage source 12 contains a thermostable zener diode connected by a cathode to the first input and an anode to the output of a stable voltage source 12 and a resistor connected between the output and the second input of a stable voltage source 12,

Claims (1)

Invention A single pulse shaper comprising a power source, the first and second transistors of the same conductivity type, the emitters of which are connected to the first power supply bus 25, the third transistor of the opposite conductivity type, five resistors, the base of the first transistor being connected through the first and the second resistors respectively to the collector of the third transistor and the first power supply bus; the collector through the third, fourth and fifth resistors respectively to the bases of the third and second transitions and to the second power supply bus, the collector of the second transistor is connected to the output of a single pulse, characterized in that, in order to increase reliability when the ambient temperature changes, the sixth and seventh resistors, a stable voltage source, and a fourth are introduced into it a transistor whose collector is connected to the second power supply bus, the base through the sixth and seventh resistors, respectively, to the second and first power supply buses, the emitter to the base of the third transistor, emitte which is connected to the output of a stable source voltage, the first and second inputs connected respectively to the first and second power supply buses. five 0 five 0