SU1370748A2 - 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 aim of the invention is to extend the range of adjustment of the pulse duration in the direction of shorter durations. To achieve this goal, the device containing the trigger signal source 1, trigger 2, trigger block 3, controlled multivibrator 4, block 5, step-by-step adjustment of the oscillation period, first gate 6, control unit 7 and counter 8, a second valve 9 and D-trigger 10 are additionally introduced. The device provides for the formation of pulses of a minimum duration, shorter than the minimum duration of the pulses of the protot Type, as a result of the elimination of the influence of parasitic signal delays introduced by the start-up unit 3, the multivibrator 4, the valve 6 and the trigger 2.1 Il. (L

Description

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The invention relates to radio metering and pulse technique and can be used in the development of a pulse generator.

The purpose of the invention is to extend the range of adjustment of the pulse duration in the direction of smaller durations.

The drawing shows an electrical block diagram of the device.

The pulse width former contains a trigger signal source 1, a trigger 2, a trigger block 3, a controlled multivibrator 4, a block 5 of a smooth-step adjustment of the oscillation period, the output of the controlled multivibrator 4 is connected to the first input of the valve 6, whose output is connected to the second input of the trigger 2 and the third output of the control unit 7, the inputs of which are connected to the outputs of the counter 8, the second output of the control unit 7 is connected to the second input of the unit 5 of the smooth-step period adjustment is oscillated first, the first output - to the second input of the valve 6; the first input of which is connected to the input of counter 8, the second axis 9 and D-flip-flop 10, the first input of the second valve 9 is connected to the inverse output of D-flip-flop 10, the second input to the first output bus of the control unit 7, and the output to The D-INPUT of the D-flip-flop 10, the synchronizing C-input of which is connected to the output of the controlled multivibrator 4, and the input of the zero R-yc-setting to the output of the first valve, the output of the pulse width generator is the direct output of the D-trigger 10.

The device works as follows.

In the analog formation of the duration in the initial state, to the second input of the second valve 9, as well as to the second input of the first valve 6, the resolving potential from the control unit 7 is supplied, which is a switch connecting the corresponding input to the corresponding output. A high potential is applied to the D input of the D-flip-flop 10 via an open valve 9 (Log. I V from the inverse of the D-flip-flop. The direct output of the D-flip-flop 10 has a low potential (Log. O).

With the arrival of a pulse from the source of 1 triggering pulses to the first input of the trigger 2, it switches and the multivibrator 4 begins to pulse the pulses. The first positive voltage drop from multivibrator 4 is fed to the C input of the D-flip-flop 10. Since this potential is high at the D-input (Log. 1), and at the single output of the D-flip-flop 10 - low (Log. O), trigger 10 is switched. At the direct output - high potential (Log. 1), and at the inverse - low (Log. O), which through the open valve 9 is fed to the D-input of the D-flip-flop 10. The second positive voltage drop from the multivibrator 4 is fed again

to the C input of the D flip-flop, and it returns to the initial state.

From the second positive voltage drop, it returns to its original state and trigger 2, and then

and multivibrator 4 in idle state.

Since the parasitic delays tj of the switching of the D-flip-flop 10 from the state OB state 1 and vice versa

are the same, then the pulse duration (G) taken from the single output of the D-flip-flop. 10 is equal to T T,

The pulse width former provides for the formation of pulses with a minimum duration (T) less than the minimum duration of the prototype pulses, due to the elimination of the influence of parasitic signal delays introduced by the start-up unit 3, multivibrator 4, valve 6, trigger 2.

In the digital version, the valve 9 is closed and the same high potential (Log. 1) arrives at the D-input of DrTpHrrepa 10. Therefore, the D-flip-flop 10 switches from the first positive voltage drop of the multivibrator 4.

In the initial state, the switching of the D-flip-flop 10 occurs simultaneously with the flip-flop 2 when a pulse arrives from the counter 8 through the control unit 7 to the R input of the set to the zero of the D flip-flop 10.

Thus, the introduction of the D-flip-flop 10 and the valve 9 allows to significantly expand the range

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the duration of the pulses in the direction of smaller durations, i.e. ensures the formation and regulation of the pulse duration from a smaller value (on the order of 5 no) than that of the prototype (from 10 no).

The shaper allows you to adjust the duration over a wide range from 5 HC to a practically unlimited size, which increases its scope.

Claims (1)

Invention Formula Shaper pulse duration auth.St. No. 790195, which is characterized by the fact that to extend the range of control of the pulse duration in the direction of shorter durations, into it A second valve and a D-trigger are entered, the first input of the second valve is connected to the inverse output of the D-trigger, the second input is connected to the first output bus of the control unit, and the output to D-flip-flop information input, the sync input of which is connected to. the output of the controlled multivibrator, and the zero-setup input is with the output of the first valve, and the V-code of the pulse width generator is the direct output of the D-flip-flop.