SU1241448A1 - Rectangular pulse shaper - Google Patents

Abstract

The invention can be used, for example, when forming rectangular pulses from sinusoidal pulses. The purpose of the invention is to increase the reliability of the device. The device contains transistors 1 and 2, resistors 3 and 4, transistor 5, threshold element 6, such as a zener diode, input bus 7. The device’s reliability of operation is achieved by introducing transistor 5 and threshold element 6, which eliminated power sources and reduced the element base . 2 Il. with o (L I Utx 4i 4a 00 fig .;

Description

The invention relates to a pulse technique and can be used, for example, in the formation of rectangular pulses from sinusoidal pulses.

The aim of the invention is to improve the reliability of the device by eliminating power sources, reducing the elemental base.

Fig. 1 shows the circuit diagram of the device} in Fig. 2 - diagrams explaining its operation.

The device contains the first and second transistors 1 and 2, the emitters of which are connected, the base of the first transistor is connected to the first terminal of the first resistor 3, the base of the second transistor 2 is connected to the first terminal of the second resistor 4, the third transistor 5, the threshold element 6 (for example, a zener diode), connected between the common bus device and the emitter of the first transistor, the emitter of the third transistor is connected to the input bus 7 and the second output of the first resistor 3, the base is connected to the collector of the first transistor, the collector is connected to the base of the second transistor ra 2, the collector of which is connected to the base. first transistor 1.

The device works as follows.

When the input signal U g (Fig, 2c |). The voltage at the output U (Fig. 2B) is also zero. If it increases, the output voltage is zero for as long as the amplitude of the voltage Ug does not exceed the sum of the voltage-voltage to open the base-emitter junction of transistor 1 and the voltage of the beginning of the conductivity of the threshold element 6. When the input signal exceeds the specified threshold voltage through the base of transistor 1 will begin to flow current, transistor 1 will open, through its collector and the emitter will flow current. As a result of the current flowing through the collector, current will flow through the emitter and collector of transistor 5 and resistor 4, creating va voltage drop across it. When this voltage reaches the conductivity value of the base-emitter junction of transistor 2 and threshold element 6, transistor 2 opens and current of resistor 3 starts to flow through the collector of transistor 2, mine transistor 1 and 5 are blocked and the current through the resistor 4 will be constant for any increase in the voltage U, i.e. output voltage amplitude

the current consumed from the source is also limited, and it is practically constant, which will increase the efficiency of the amplifier-limiter.

When the voltage Ug decreases below the threshold value, transistors 1,2 and 5 are locked and the output voltage is zero. As a result, a signal is generated at the device output (see Fig. 2b).

The principle of operation of the device is based on the fact that in the open state at its output, regardless of the load current, a predetermined voltage drop is provided, thereby setting

the minimum required to turn on the load current. Moreover, the output current does not depend on the magnitude of the input voltage and the current consumed from the input voltage does not depend on

The input voltage is only a function of the magnitude of the load voltage.

Changing the magnitude of the beginning of the conductivity of the threshold element 6, for example, by including several

series-connected silicon diodes, it is possible to regulate the magnitude of the output voltage.

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Claims (1)

Invention Formula A rectangular pulse driver containing the first and second transistors, the emitters of which are connected, the base of the first transistor is connected to the first terminal of the first resistor, the base of the second transistor is connected to the first terminal of the second resistor, different by the fact that, in order to increase the reliability of operation, a third transistor is inserted in it, a threshold element included; between the common bus device and the emitter of the first transistor, the emitter of the third transistor is connected to the input bus and the second output of the first resistor, the base is connected to the collector of the first transistor, the collector is connected to the base of the second transistor, the collector of which is connected to the base of the first transistor, and the second output of the second resistor is connected to the common bus. Ubox Compiled by A. Gorbachev Editor M. Nedoluzhenko Tehred L. Oleinik Proofreader M. Maksimishinets 3612/54 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Iput.Z