SU875611A1 - Pulse duration discriminator - Google Patents

Description

The invention relates to a pulse technique and can be used in information and measurement, and computational systems. Known impulses for duration, containing a single vibrator and two output elements And, the first inputs of KOTOpbix. Are connected respectively to the input and output of the single vibrator directly, and the second inputs - with the output and input of the single vibrator via fl} inverters. The disadvantage of such a selector is a change in the duration of the output pulses and the dependence of the delay of the output pulses on the duration of the input pulses. The closest in technical essence to the invention is a pulse selector in duration, containing two flip-flops, the outputs of the first of which are connected to the inputs of the second, and the inputs directly and through the single-oscillator to the input bus, two AND-NOT elements, the first inputs of which are connected to the outputs of the second trigger, in which in the established mode of operation, the duration of the output pulses is equal to the duration of the input pulses and the dependence of the delay of the output pulses on the duration of the input pulses is reduced. lecturer pulse duration - crushing said first wide pulse that distorts the total amount and duration of the output pulses, i.e. reduces the accuracy of his work. The purpose of the invention is the elimination of apo6 Lenin pulses. The goal is achieved by the fact that the pulse selector has a one-shot duration, the input of which is connected to the input bus and the first input of the first trigger, and the output of the second input of the first trigger, the first and second output elements Y-NOT, the first inputs which are connected to the outputs of the second trigger introduced

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the third, fourth and fifth elements AND-NOT and the element OR-NOT, the first inputs of which are connected to the input bus, and the second inputs to the output of the one-vibrator, the third inputs of the third and fourth elements AND-NOT connected to the outputs of the first, trigger, and the outputs to the Bhopus of the second trigger, with the outputs of the element OR-NOT and the fifth element AND-NOT connected to the second inputs, respectively, of the first and second elements of the TH-NOT.

The drawing shows a structural electrical circuit of the device.

The pulse selector contains a single-pulse 1, an element OR-NOT 2, triggers 3 and 4, the first and second, performed on the elements AND-NOT 5-8, the elements AND-NOT 9-13 from the first POP tyy.bus 14 input and tires 15 and 16 output, this bus 14 is connected to the input of the one-shot 1 and the first inputs of the trigger 3, the element AND-NO 11, 12, 13 and the element OR NOT the second input of which is connected to the output one-one and 1, to the second inputs of the elements AND- NOT 11-13 and trigger 3, the outputs of which are connected to the third inputs of the elements AND NOT 11 and 12, the outputs of which are connected to the inputs of the trigger 4, the output rows are connected to first inputs of AND-NO elements 9 and 1O, which are connected respectively to the outputs .vtor1eVhody OR-NO elements and two AND-NO element 13, and outputs - to the buses 15 and 16.

Works pulse selector for the duration as follows.

The input pulses are zero, the level arrives at the bus 14 and the first inputs of the AND-NE elements 11-13 and 2.a also to the input of the one-vibrator 1. The one-vibrator 1 on the leading edge of the input pulse generates a zero-level pulse of a set duration regardless of the duration of the input pulse ..

. The pulses from the output of the oscillator 1 are fed to the second inputs of the elements AND-NOT 11 and 12 and to the second input of the trigger 3, the input pulses go to the first input of it. If the duration of the input pulses is longer than the duration of the pulses generated by the inverter 1, then the output of the AND-NE element 5 will be a high unit signal level, and the output of the AND-НЁ 6 element will form the inverted signal of the single vibrator 1.

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The signals from the outputs of the trigger 3 are received at the third inputs of the elements AND NOT 11 and 12.

At the output of the NAND 12 element there will be a high unit signal level, since in the interval between the input pulses a zero signal from the NAND 6 element arrives at its third input. At the output of the NAND 11 element, an inverted input signal of the device is formed.

. The signals from the outputs of the elements AND-NOT 11 and 12 are fed to the inputs of the second trigger 4. At the output of the element

AND-NO 8 will be a single signal, and at the output of the element AND-NOT 7, a zero signal. A single signal from the output element AND-NOT 8 is fed to the first input of the element AND-NOT 1O, to the second

input. Which receives the inverted input pulses of the device, formed by the element AND NOT 13.

The AND-NE 1O element is opened, and the zero-level pulses coinciding

in phase and duration with input pulses of the device, pass to the bus 15.

If the duration of the input pulses changes and becomes shorter than

the duration of the pulses generated by the one-shot 1, the first pulse is no. the pulse sequence of the ugly pulses is compared in duration with the pulse duration of the one-shot 1, at the output of the AND-NE element 13 a pulse is formed whose duration is equal to the pulse duration of the one-shot 1 which passes through the AND-HE element 1O to the bus 15;

At the end of the input pulse, the output signal of the NAND 5 element is set to a zero signal, and at the output of the NAND element, 6 is one, which is fed to the inputs of the NAND NI elements.

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. At the end of the pulse from the one-shot 1, the element AND-NO 12 is triggered and causes the switching of the trigger 4, 1a FIETI on the 1st input. The element AND-NOT 7

Claims (2)

a single signal is set, arriving at the first input of the element AND-NE 8 to prepare for passing the next input pulse to the bus 16 through it, and the output of the element AND-NE 8 is set to zero, the closing element AND-NOT Y. At the output of the element OR-HE 2, unit-level pulses are formed, the phase and duration of which coincide with the device's input pulses. . The pulses from the output of the element OR-NOT 2 arrive at the second input of the element AND-HE 9, prepared by the first input with a single signal from the output of the element AND-NOT 7, and from the output of the element Ji-HE 9, zero-level pulses coinciding in phase and duration with the input pulses of the device, go to the bus 16. If the duration of the input pulses changes again and becomes longer than the duration of the pulses of the one-vibrator I, then the first input pulse of a new sequence of wide pulses passes through the element OR-HE 2 and the element AND-HE 9 to the bus 16, long This pulse is limited to an element OR-NOT 2 at the level of the pulse duration of the one-shot 1. At the end of the first input pulse of a sequence of short pulses at the output of the NAND 11, a zero signal is generated that switches the trigger 4 to the opposite state, in which the output of the AND - NO 8, a single signal is set, and a zero signal at the output of the NAND element. The output signals of the trigger 4 prepare the AND-NE elements for passing the following device input pulses to the bus 15 through it and close the AND-NE element 9. The trigger 4 switches after the end of the input pulse, therefore, the splitting of the output pulses does not occur. the solutions exclude the fragmentation of the pulses when their duration changes, the second trigger 4, which 116 controls the output elements AND-HE; switches after the end of the input pulse, which allows you to enter a poll of the Output Elements AND-HE 9 and 1 O with the pulses from the outputs of the AND-HE 13, OR-HE 2 elements generated by their device input pulses and the one-shot pulses, and reduces the distortion of the device's output pulse durations . Claims of the Selector pulse duration, containing a single vibrator, the input of which is connected to the input bus and the first input of the first trigger, and the output to the second input of the first trigger, the first and second elements of the NAND, the first inputs of which are connected to the outputs. trigger, characterized in that in order to eliminate 1H pulses, the third, fourth and fifth elements of the AND-NOT and the element OR-NOT, the first inputs of which are connected to the input bus, and the second inputs of the one-vibrator, the third the inputs of the third and fourth elements of the NAND are connected to the outputs of the first trigger, and the outputs are to the input of the second trigger, while the outputs of the OR-NOT element and the fifth element of NI are NOT connected to the second inputs of the first and second elements, respectively. into account in examinations 1.Avtorskoe certificate of the USSR M 449 411, Cl. N OZ K 5/18, 1975. 2. USSR author's certificate No. 599340, cl. H 03 K 5/18, 1978.