SU560328A1 - Shaper duration of electrical impulses - Google Patents

Description

one

The invention relates to a pulse technique and can be applied in an electron-physical and laboratory annaratura of the nanosecond range.

A shaper of the duration of electrical PM pulses is known, which contains an input shaper on a transistor, the collector of which includes a threshold device and a time setting line, a splitter on two transistors whose emitters are connected to a mixer: one directly, the other through the 1J delay line. However, setting up such a scheme is difficult.

Of the known devices, the closest to the technical essence of the present invention is a shaper of electrical impulses, containing as a starting cascade a current generator made on a transistor, the collector of which includes a circuit from a parallel connection of a threshold device on the TD and inductance as the driving time The recharge of which results in the discharge of the 2J.

After resetting the threshold device for the duration of the generated pulse, such a circuit is insensitive to triggering, which significantly increases its recovery time, which increases with increasing duration of the generated pulse.

The purpose of the invention is to reduce the recovery time.

This is achieved by the fact that, in the proposed former, the duration of the electric

impulse-at the time of the reference line, open at the free end, through the terminating resistor is connected to the emitter of the transistor.

The essence of the invention is to separate the time of the driving line and the threshold

device operating in the trigger mode, the active element (transistor), whereby the pulse of the same polarity applied to the base (input) and emitter (reflected) of the transistor, creates

its collector has opposite-current pulses, one of which is used to trigger the threshold circuit and the other to reset it, the duration of the generated impulse from the recovery time

is excluded.

FIG. 1 shows the basic electrical circuit of the proposed shaper; in fig. 2 - oscillograms of his work; in fig. 3 - Volga-ampere characteristic of the threshold device.

A shaper for electric power pulses contains a transistor 1, between the collector of which and power supply 2 a threshold device 3 is turned on, for example, in the form of a parallel connection of a tunnel

a conventional diode, the emitter of transistor 1 includes a circuit from the series connection of a matching resistor 4 and the time of the master line 5, as which, cable length can be used as sodium. Between the collector of transistor 1 and the power supply bus 6, a mode resistor 7 is connected, which provides statistical direct current through the threshold device. The resistor 8 at one end is connected to the base of the transistor 1, the other end to the common bus. Modular resistor 9 is connected between the emitter of transistor 1 and the power supply bus 10.

The shaper of the duration of the electrical impulses works as follows.

In the initial state, through the threshold device 3, for example through a tunnel diode, a current is flowing defined by resistor 7 and a reverse current equal to the collector current of transistor 1.

The total current, equal to the difference of the above currents flowing through the threshold device 3, keeps the latter in the initial zero state (point a in Fig. 3). A short negative pulse arriving at the base of the transistor (driver input) (Fig. 2, a) reduces the collector current of transistor 1, increases the voltage across it (fi-g. 2.6), thereby increasing the current through the threshold device 3. The threshold device 3 enters a single state (point in in Fig. 3). The same input pulse creates in the emitter of transistor 1 a voltage pulse of negative polarity (Fig. 2, s), which through a matching resistor 4 enters the input of the time of the driving line 5. This time through the output of the open end of the transistor, this pulse ( where t3 is the time delay on the time of the master line), again enters the emitter of the generator transistor 1, causing an increase in the current in its collector circuit. The total current through the threshold device 3 (Fig. 2, d) decreases, transferring it to the initial zero state (points d, e in Fig. 3).

The use of the proposed electric pulse duration generator with a short recovery time allows to increase the limit loading of the circuits, where it is used, by about 2 times as compared with the prototype - up to 10 pulses / sec.

Claims (2)

1.Verswelej. Ihe New CERN. Fast Nurlear Electronic System. International Symposinm on Nuclear Electronic Versailles 10-13. Sept. 1968. 2. Theory and design of TD-schemes. M .., "Owls. radio, 1971, p. 111, fig. 321 (A and B). f A Benefits