SU1399887A1 - Pulse shaper - Google Patents

Abstract

The invention can be used in pulsed and computing technology in the construction of generators - and pulse shapers. The invention increases the stability of the duration of the generated pulses when the ambient temperature changes. The driver is made on two bipolar transistors 1 and 2 of different conductivity types, capacitors and resistors shown in the drawing. The open time of the transistor 2 is determined by the time constant defined by the resistor 6 and the capacitor 9. At the moment when the voltage on the capacitor 4 reaches the unlocking threshold of the transistor 1, the voltage near its collector is close to zero. At the same time on the resistor 8 a pulse will be formed. Upon completion of the charge of the capacitor 9, the transistor 2 is locked and the circuit is reset. The proposed device in contrast to the prototype provides the formation of pulses with a high duty cycle. 1 il. W

Description

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The invention relates to a pulse technique and can be used in the construction of generators and pulse shapers.

The aim of the invention is to increase the stability of the duration of the generated pulses with changing ambient temperature,

The drawing shows a diagram of the former.

The driver contains bipolar transistors 1 and 2 of different conductivity types, resistor 3, capacitor 4,

resistor 6. The charge current of the capacitor 9 flows through the circuit: power source - emitter-base junction of transistor 2 - resistor 6 - capacitor 9 - input source - common bus, and keeps transistor 2 in the open state. The open state time of transistor 2 is determined by resistor 6 and capacitor 9. At the moment when the voltage on capacitor 4 reaches the opening threshold of transistor 1, a voltage is established on its collector, near

resistors 5-8, capacitor 9. Collective to zero. On resistor 8, the transistor 1 forms a transistor 8 through a resistor 8 to the power bus, an emitter to a common bus, a base to the first terminals of the capacitor 4 and a resistor 7. The second output of the capacitor 4 connected to the 20 input terminal. The collector of transistor 2 is connected to the first output of resistor 7, the emitter to the first output of resistor 3 and the second output of resistor 5, and to the power supply bus. The base of transis-25 of torus 2 is connected to the second output of resistor 3 and through series-connected resistor 6 and capacitor 9 to the input of the device.

The shaper operates as follows.

In the initial state, a high voltage level was applied to the driver input. Transistor 1 is open. Resistor 3 provides the closed state of the transistor 2. Capacitor 4 is charged to a voltage that is equal to the input voltage of the driver minus the voltage drop at the emitter junction - the base of the open transistor 1. When the input voltage goes to a low level, transistor 1 closes and its collector is set to a voltage close to E, the transistor 2 opens and shuns the resistor 5. The capacitor 4 recharge current flows through the circuit: power source - open transition emitter-collector of transistor 2 - resistor 7 - capacitor 4 - input source - common bus. The base current of the transistor 2 is limited to 50

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Editor E. Kopcha

Compiled by Y. Polinov

vals impulse. At the end of the charge of the capacitor 9, the transistor 2 is closed and the circuit is reset.

Claims (1)

Invention Formula A pulse shaper containing a first transistor, the collector of which is connected to the first output of the first resistor, the second output of which is connected to the power bus, a common bus that is connected to the emitter of the first transistor, the base of which is connected to the connection point of the first terminals of the second resistor and the first capacitor, the second output which is connected to the input terminal, characterized in that, in order to increase the stability of the pulses, a second transistor of the opposite conductivity type is introduced, the third resistor, the first output which is connected to the connection point of the second output of the second resistor and collector of the second transistor, the emitter of which is connected to the connection point of the power bus, the second output of the third resistor and the first output of the fourth resistor, the second output of which is connected to the connection point of the base of the second transistor and the first output n the resistor, the second output of which is connected to the first output of the second capacitor, the second output of which is connected to the input terminal. Tehred M. Didyk Corrector I. Muska ol rinov vals impulse. At the end of the charge of the capacitor 9, the transistor 2 is closed and the circuit is reset. Invention Formula A pulse shaper containing a first transistor, the collector of which is connected to the first output of the first resistor, the second output of which is connected to the power bus, a common bus that is connected to the emitter of the first transistor, the base of which is connected to the connection point of the first terminals of the second resistor and the first capacitor, the second output which is connected to the input terminal, characterized in that, in order to increase the stability of the pulses, a second transistor of the opposite conductivity type is introduced, the third resistor, the first output D which is connected to the connection point of the second output of the second resistor and collector of the second transistor, the emitter of which is connected to the connection point of the power bus, the second output of the third resistor and the first output of the fourth resistor, the second output of which is connected to the connection point of the base of the second transistor and the first output of the fifth resistor The second terminal of which is connected to the first terminal of the second capacitor, the second terminal of which is connected to the input terminal. Corrector I. Muska