SU748795A1 - Device for shaping radio pulses - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF RADIO IMPULSES

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The invention relates to measurement technology, automation, radio.pocation.

 A device for generating radio pulses is known, which contains a transistor, in the emitter circuit of which 5 an automatic bias circuit is connected, to the base of which an inductor is connected, the first capacitor is connected to the collector, the second capacitor O is connected between the base of the transistor and the common bus, resistors, some of which are connected, and video pulses 1 are fed to the point of their connection.

 However, the known device does not compromise the necessary accuracy of the transmission of the control phase of the video pulses with the output radio pulses.

The purpose of the invention is to increase the accuracy of the transmission of the control-de-impulse phase of the output pulses of the output E of the radio pulse. mi

To do this, in the device for forming radio pulses containing a transistor, in the emitter circuit of which 25 an automatic bias circuit is connected, to the base of which the inductor is connected, the first capacitor is connected to the collector between the base of the transistor and the common transistor.

A second capacitor is connected, as well as first and second resistors, some of whose terminals are connected, and control video pulses are fed to the point of their connection, another output of the inductance coil is connected via a third resistor and a third capacitor connected in series to the collector of the transistor. the resistor is connected to the common bus, while the other terminals of the first and second resistors are connected respectively to the base, and the collector of the transistor, and the other lead of the first capacitor is connected to the common bus.

FIG. 1 shows a schematic electrical circuit arrangement for generating radio pulses; in fig. 2-4 are timing diagrams explaining the operation of the proposed device.

The device contains a transistor 1, a capacitor 2, J {a detector 3, t inductor 4, resistor 5, capacitor b, resistor 7, terminal 8 to which the control source of the video pulse is connected, resistors 9 and 10, automatic bias circuit consisting of resistor 11 and capacitor 12.

The device works as follows. , Prior to the arrival of the control video pulse, the capacitors 2 and 3 are rashed, and on the capacitor b there is some sapHfJ and, correspondingly, paisHOCTb potentials, a constant voltage component, the field of which is indicated in FIG. 1 by the signs + and. Upon receipt at time t, the controlling video pulse (Fig. 2) starts charging the capacitor 2 and increasing the collector voltage of transistor 1 (Fig. 4). The charging of the capacitor 3 also occurs, and as the voltage across the capacitor 3 rises. the current through the coil 4 of the inductance increases (fig. 3) increases. At the moment fcj (fig 3), the voltages on the collector and base of transistor 1 reach the value at which transistor 1 is unlocked. When this occurs, the discharge current of the capacitor b. Capacitor b is discharged along the circuit: plate +: transistor 1 - bias circuit from resistor 11 and capacitor 12 - common bus - resistor 7 - plate resistor 5 (figure 1). The occurrence of the discharge current of the capacitor b leads to a change in current through inductance 4 In this case, an EMF pulse arises in the feedback circuit, which triggers the generator.

Resistor 5 allows you to select the damping factor of the oscillations in the circuit for which the required rate of increase of the generated oscillations will be provided,

At time tj (Fig. 2), the action of the control of the video impulse stops, and the oscillation is disrupted. For normal operation of the device, it is necessary to ensure the discharge of capacitors 2 and 3 In the pause between the control video pulses, which is achieved by the correct choice of the constant time of the discharge circuits. Capacitor B should not have time to discharge in the pause between control video pulses. The value of capacitor 6 must be selected by 2-3

748795

the order is larger than the contour capacitances of capacitors 2 and 3. At the same time, the effect of the cocadensatra b on the generated frequency is almost absent, and the triggering impulse generated by the capacitor b ensures a high stability of the generator start.

Technical and economic efficiency of the device for forming. radio pulses is to improve the accuracy of the transmission phase of the control video pulses output radio pulses.

Claims (1)

Invention Formula Device for generating radio pulses, containing a transistor, in the emitter circuit, whose switch is on a chain of an automatic displacement, to the base of which an inductor is connected, a first capacitor is connected to the collector, a second capacitor is connected between the base of the transistor and the common busbar, as well as the first and second resistors, one terminals of which are connected, and control pulses are supplied to the connection point , characterized in that, in order to control the phase of control of the video pulses by the output radio pulses, another output, the inductance coil is connected via a third resistor and a third capacitor in series to the collector of the transistor, and through the fourth resistor introduced to the common mHjHe, and the other conclusions of the first and second resistors are connected Similarly with the base and collector of the transistor, and the other end of the first capacitor is connected to the common bus. Sources of information taken into account in the examination ,. 1. US Patent 3,849,741, cl. H 03 H 5/00 (331-165), published. 1974 (prototype).