SU1167703A2 - Pulser with multivolt supply voltage - Google Patents

Abstract

PULSE GENERATOR WITH CURRENT VOLTAGE POWER BY AUT. St. No. 1064428, characterized in that, in order to increase the output pulse repetition rate, an additional transistor is inserted between the emitter of the main transistor and the second power supply bus, the collector of which is connected to the emitter of the main transistor, the base is connected to the first power supply bus through the resistor, with second power supply bus.

Description

The invention relates to a pulse technique and can be used in radio engineering devices for various purposes, for example, in computing technology, communication technology, telemetry, etc.

According to the main author. St. No. 1066428 is a pulse generator with a millivolt supply voltage, comprising a transistor, a transformer, the first winding of which is connected between the first power supply bus and the collector of the transistor, the second winding of the transformer connected between the first power supply bus and the base of the transistor, the emitter of which is connected to the second power supply bus , the first and second windings of the transformer are connected to the first power supply bus with opposite poles 1.

The disadvantage of the device is a low repetition rate of the output pulses.

The purpose of the invention is to increase the frequency of the output pulses.

The goal is achieved by introducing an additional transistor between the emitter of the main transistor and the second power supply bus, the collector of which is connected to the emitter of the main transistor, the base through a resistor connected to the first power supply bus, and the emitter to the second power supply bus.

The drawing shows a schematic diagram of the generator.

The pulse generator circuit contains the main transistor 1, between the collector and the base of which are connected connected according to two windings of transformer 2. In the emitter circuit of the main transistor 1, an additional trazistor 3 is connected to the collector, the emitter of which is connected to a common bus, and the base is connected to a power source through a resistor 4. The power to the collector and the base of the main transistor 1 is supplied through the windings of the transformer 2, and the output signal is taken through the capacitor 5.

The generator works as follows.

At the moment when the supply voltage is low (on the order of tenths of a volt), the transistor 3 is open, because a positive bias from the power source through resistor 4 is applied to its base relative to the emitter, and transistor 1 starts

avalanche-closure due to the fact that the current arising in the windings of the transformer 2 at the initial moment of time causes the appearance of a self-induced EMF, which in negative polarity is applied to the base

and the collector of the transistor 1. The moment of maximum EMF of self-induction induced in the transformer windings corresponds to the formation of the pulse front on the collector of the transistor 1. At the same time

charging the collector-emitter junction capacitance and base emitter of transistor 1 and the collector emitter capacitance of transistor 3. In the process of charging these junction capacitances, the top of the pulse is formed at the collector of transistor 1. As they decrease

The EMF of self-induction in the windings of the transformer and the charge of the junction capacitors of transistor 1 opens, which corresponds to the formation of a pulse decay. Thus the processes described result in

that a voltage pulse of positive polarity is generated on the collector of transistor 1.

After opening the transistor I will start the discharge of the above capacitances

transitions and the time required for the discharge will determine the pause between the generated pulses, i.e. the period of their repetition.

The increase in the pulse repetition frequency generated by the generator is explained by

the fact that the capacitances of the collector-emitter transitions of transistors 1 and 3 are connected in series and, therefore, the resulting capacitance is less than that of a single transistor, as is the case in the prototype, therefore its discharge time decreases, and

pulse repetition rate will be higher. The proposed device can work not only in the self-oscillation mode, but also in the mode of amplifying sinusoidal oscillations or generating pulse bursts,

for which it is necessary to apply either a sinusoidal voltage or a rectangular pulse respectively to the base of the transistor 3.

In comparison with the prototype, the proposed generator provides an increase in the repetition rate of the output pulses by an order of magnitude or more.

Claims (1)

PULSE GENERATOR WITH VOLTAGE VOLTAGE OF POWER SUPPLY by ed. St. No. 1064428, characterized in that, in order to increase the repetition rate of the output pulses, an additional transistor is introduced between the emitter of the main transistor and the second bus of the power source, the collector of which is connected to the emitter of the main transistor, the base is connected through the resistor to the first bus of the power source, and the emitter is with a second power supply bus.