SU1411942A1 - Pulse duration shaper - Google Patents

Abstract

The invention relates to a radio measuring technique and can be used in the development of pulse generators. The purpose of the invention is enhanced functionality by remotely controlling the duration. Another goal is to increase speed. The former contains multivibrator 1 on the first ECL fan 2, power supply bus 5, trigger 7, output bus 8, input bus 9, diodes 10 and 14, second ECL valve 13, adjustable DC generator 17, capacitor 3, resistors. The proposed shaper provides remote control of the duration, significantly reduces the instantaneous instability of the duration due to. ensuring the beginning of the working process with the rapid discharge of capacitor 3. 2 Il. (L

Description

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1

The invention relates to a radio-measuring technique and may not be used when developing a pulse generator.

The purpose of the invention is to enhance the functionality by remotely controlling the duration and increasing the speed.

FIG. 1 shows the electrical schematic diagram of the device; in fig. 2 - time diagrams of his work.

The pulse width driver contains a self-oscillating multivibrator 1 on the first ECL valve 2, the first input of which is connected via a capacitor 3 to its direct output, which through the first resistor 4 is connected to the power bus 5, which is connected through the second resistor 6 to the inverse output of the first ECL valve 2, the second input of which is connected to the direct output of the trigger 7, the inverse output of which is connected to the output bus 8, and the first input is connected to the input bus 9, the first diode 10, the third and fourth resistors 11 and 12, the first outputs of which x are connected to the power bus 5, the second terminal of the third reactor 11 is connected to the forward output of trigger 7, the second ZSL-ven-shl 13, the second diode 14, the fifth and sixth resistors 15 and 16, an adjustable DC generator 17, the output of which is connected to the first input of the first ECL valve 2 and through the anode-cathode of the first diode 10 is connected to the cathode of the second diode, which through the fifth resistor

15connected to the power bus 5, which is connected via the sixth resistor

16c with the inverse code of the second ECL valve 13 and with the second input of the trigger 7, the direct output of the second ECL valve 13 is connected to the anode of the second diode 14, the first and second inputs of the second ECL valve 13 are connected respectively to the inverse output of the first ECL fan 1 and 2 its second input, the second output of the fourth resistor 12 is connected to the inverse of the trigger output 7.

The device works as follows.

In the initial state, the ECL valves 2 and 13 are closed by supplying the inhibitory potentials to their inputs from the direct output of the RS flip-flop 7 (Fig. 26). Then the direct outputs of the ECL valves 2

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five

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and 13 have potential log. 1, therefore, the capacitor 3 is charged to the potential of Log. 1 (FIG. 2e), which is fixed by means of diodes 10 and 14, a diode 14 connected in the forward direction, is intended to compensate for the direct voltage drop across the diode 10, i.e. serves to match potential levels. This is because the differences between the ECL levels and the voltage drop across the open diode are about the same.

The initial level of the capacitor 3 is fixed only in the case when the maximum current of the regulated dc generator on the pn-r-transistor of the dc generator 17 is less than the direct current flowing through the diode 10.

With the arrival of a short positive pulse formed between ECL levels at the input R (Fig. 2a), the trigger 7 (Fig. 26, c) tilts-c, and causes the switching of the ECL valve 13 (Fig. 2d). Then the direct output of the ECL valve 13 has the potential of a Log, O. The capacitor 3 begins to quickly discharge through a small resistance of the open diode 10, and as soon as the potential on it reaches the threshold of operation of the ECL valve 2 (Fig. 2e, it switches to a regenerative state ( Fig. 2e). A potential appears at its inverse output. Log. 1 which switches the ECL valve 13. Diode 10 closes as the negative potential at the anode is greater than at the cathode. Condenser 3 begins to charge direct current from the generator 17 DC, the value of which re It is insulated with a resistor. As soon as the potential on the capacitor 3 reaches the threshold of operation of the ECL-vent 2, it switches to the initial state and causes the ECL valve 13 to switch, which then switches the trigger 7 (FIG. 26) to the initial state. The ECL valve 13 switches to the initial state. By varying the charging current, the pulse duration is adjusted.

From the consideration of the principle of operation of the proposed driver, it can be seen that it can significantly reduce the recovery time of the circuit, provides remote control of the power output, as well as using a DAC

3.4

by changing the base potential of the transistor of the dc generator 17, and also significantly reduces the instantaneous instability of the duration (tfy) by ensuring that the circuit starts working with a fast discharge of the capacitor 3.

Claims (1)

Invention Formula A pulse width shaper containing a self-oscillating multivibrator on the first ECL valve, the first input of which is connected via a capacitor to its direct output, which is connected through the first resistor to the power bus, which is connected-. the second resistor on the chain has an inverse output of the first ECL valve, the second input of which is connected to the direct output of the trigger, the inverse output of which is connected to the output bus, and the first input is connected to the input bus of the first, third and fourth resistors, the first terminals of which are connected to the bus power supply, second pin 42 The third resistor is connected to the forward trigger output, characterized in that, in order to extend the functionality by remote control, increase speed, a second ECL gate, second diode, fifth and sixth resistors, adjustable DC generator, the output of which is connected to the first input of the first ECL valve and through the anode-cathode of the first diode is connected to the cathode of the second diode, which is connected via a fifth resistor to the power cable, which is connected through the sixth resistor to the inverse output of the second ECL valve and with the second trigger input, the direct output of the second ECL valve is connected to the anode of the second diode, the first and second inputs of the second ECL valve are connected respectively to the inverse output of the first ECL valve and its second input, second, output of the fourth ezistora connected to the inverted output of the flip-flop. Fib.2 Compiled by V. Chizhikov Yedaktor N. Gunko Tehred M. Didyk Proofreader M. Sharoshi Order 3671/54 Circulation 928 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Subscription