SU983999A1 - Device for shaping pulse trains - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF PUTS OF PULSES,.

The invention relates to a pulse technique and can be used in instrumentation for a discrete-link system.

A device for generating bursts of pulses, comprising a clock generator, two pulse counters, a trigger, a coincidence element and a sampling element t 1, is known.

The disadvantages of this device are the dependence of the interval between the series of pulses on. the quality of the pulses in the series and the operating frequency of the device and the distortion (shortening) of the first and last pulses in the series in case the delay of the counters and the trigger is more than half the period of the clock frequency.

The closest technical solution is a generator of a series of pulses with adjustable intervals within the series, which contains a clock generator, a storage unit, a single-pulse driver, which is made in the form of a continuous multivibrator, the element BANGE 2.

However, in this device, there is a dependence of the durations of intervals, which are formed by the storage device and the waiting multivibrator, the interval during which the pulses from the generator pass to the output of the BANNER element is equal to the difference of the interval formed by the storage unit and the interval

10 formed by a multivibrator, therefore the number of pulses in a series depends not only on the division ratio of the accumulative block, but also on the duration of the pulse of the multivibrator

15 and its stability, and the interval at the output of the multivibrator cannot be greater than or equal to the interval formed by the storage unit, and, moreover, asynchrony of the beginning and end of the pulse generated by the multivibrator, the distortion (shortening) of the first and last pulses in the series, which leads to limited functional possibilities (the interval between the series of pulses generated by a single vibrator cannot be longer than the interval formed by the storage device) and to inaccuracy of the installation ovki number of pulses

5 series, and reliability is not functional enough (the possibility of pulse distortion at the boundaries of the series),

The aim of the invention is to expand the functionality and improve the accuracy of the formation of the device.

This goal is achieved due to the fact that a differentiating circuit and a trigger are connected to the device for generating pulse trains containing a clock generator, a storage unit, the output of which is connected to the jepes of forms {single pulse pulse. With the first input of the BAN element, the trigger circuit is connected to the input cumulative block, the first input of the trigger is connected to the output of the clock pulse generator and through a differentiating circuit to the second input of the BAN element, the output of which is connected to the second input of the trigger.

A single pulse shaper contains a series-connected clock generator, the frequency divider and the trigger whose output is the output of the shaper, and the input of the shaper are the second inputs of the frequency divider and the trigger.

The drawing shows the functional diagram of the device.

A device for generating more pulses contains a generator of 1 clock pulses, a storage unit 2, a differentiating circuit 3, a BREAK element 4, a trigger 5, a single pulse former, which can be executed, for example, on a divider 7 hours, a trigger 8 and a generator 9 clock pulses.

In addition, the shaper 6 single pulse can be performed as a standby multivibrator.

The device works in the same way.

The clock pulses from the output of the generator 1 are fed to one of the inputs of the trigger 5 and set it to the zero state. In the absence of a inhibitory pulse at the output of the imager b, which in the case under consideration is designed as a multivibrator in wait, the pulses from the output of the differentiating circuit 3 are fed through element 4 to another input of the trigger 5 and set it to a single state. In this case, the pulses at the output of the trigger 5, equal in duration to the clock, arrive at the input of the accumulation unit 2. After the accumulation unit 2 is filled, an impulse appears at its output, along the leading edge of which the driver b is started. A pulse of a predetermined duration from the output of the imaging unit 6 prohibits the passage of the pulses of the installation of the trigger 5 into one state from the output of the differentiating circuit 3. As a result,

the trigger 5 remains in the zero state until to the left, or at the output of the element 4 of the first pulse after removal of the prohibition, with the arrival of which the trigger 5 switches to one

0 and the process is repeated. Thus, a pause is formed at the output of the trigger 5, the duration is equal to the nearest integer number of clock intervals contained in the pulse,

5 formed by the shaper 6, performed in this case on the waiting multivibrator.

In the case when the driver b is made on the divider 7, the trigger 8

0 and the generator 9, the device operates as follows.

The clock pulses from the output of the generator 9 are fed to the input of the frequency divider 7. The first pulse from the output of the divider 7 switches the trigger 8 to the zero state. The clock pulses from the output of the generator 1 are fed to one of the inputs of the trigger 5 and set it to the zero state. In the absence of a prohibiting impulse at the output of the trigger 8, the pulses from the output of the differentiating circuit 3 enter through the element 4 to the other input of the trigger 5 and establish it in a single state. At the same time, the pulses at the output of the trigger 5 equal in duration to the clock ones arrive at the input of the accumulation unit 2. After the accumulation unit 2 is filled, an impulse appears at its output, on the leading edge of which the divider 7 returns to its initial state condition. After a time interval defined by the division factor of the divider 7 and the period of the clock frequency of the generator 9, a pulse appears at the output of the divider 7, switching the trigger 8 to the zero state.

Thus, at the output of the trigger 8, a pulse of a predetermined duration is formed, prohibiting the passage of the pulses of the trigger 5 into a single state from the output of the differential circuit of circuit 3. As a result, the trigger 5 remains in the zero state until the output of the element 4 of the first after the prohibition is removed momentum with the advent of which

trigger 5 is switched to the one state, and the process is repeated.

Thus, at the output of trigger 5, a pause is formed, the duration is equal to the nearest integer

5 periods of the clock frequency of the generator 1, contained in the pulse generated by the shaper 6, performed on the divider 7, the generator 9 clock pulses 6, and the trigger 8.

Thus, in the proposed device, in comparison with the known number of pulses in a pack, it is equal to the accumulation rate of the accumulation unit and the JOT of the selected pause is set independently, which improves the accuracy of the formation of the pack and allows you to change the length of the packs and the pause between them in the nrapOKCW limit with optimal use of the storage capacity block, which expands the functionality of the device.

Claims (2)

Invention Formula .one. A device for generating bursts of pulses, containing a clock pulse generator, a cumulative unit whose output is connected through a single pulse shaper to the first input of the BAN element, is distinguished by the fact that, in order to enhance the functionality and improve the accuracy of the formation, a differential circuit and trigger, the output of which is connected to the input of the accumulative block, the first input of the trigger is connected to the output of the clock pulse generator and through a differentiating circuit to the second input of the BAN element, the output of which is connected to the second input of the trigger, 2. The device according to claim 1, characterized in that the single pulse shaper comprises a serially connected clock, a frequency divider and a trigger, the output is the shaper output, and the shaper input is the second inputs of the frequency divider and trigger. Sources of information taken into account during the examination 1. USSR author's certificate 627570, cl. H 03 K 3/64, 1978. I 2. USSR Copyright Certificate 263661, cl. H 03 K 3/64, 1970.