SU1367137A1 - Shaper of pulse trains - Google Patents

Description

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eleven

The invention relates to a pulse technique and can be used as a generator of test signals in various digital and radio systems.

The aim of the invention is to expand the functionality due to the possibility of obtaining pulse sequences with a periodically varying frequency, with the possibility of adjusting the period of change of frequency.

The drawing shows a functional diagram of the pulse pattern driver.

The pulse sequence generator contains serially connected pulse generator-G and the first counter 2, whose information outputs are connected to yir by the equalizing inputs of multiplexer 3, the output of which is connected to the counting input of the second counter 4, the overflow output of which is connected to the input of the first trigger 5 the output of which is connected to the input of the counting direction of the second counter 4 and to the input of the second trigger 6, the output of which is connected to the information input of the multiplexer 3, another information input which connected to a single bus layer.

The pulse shaper works as follows.

The counters 2 and 4 and the triggers 5 and 6 can be preset to the initial zero state (the installation circuit is not shown).

Before operation, the duration of the output pulses (f) is determined, which is determined by the frequency of the generator 1 (F) and the number of serial information inputs of the multiplexer 3 (n,) connected to the single-level bus, i.e. T

 n, -5 the frequency of the output pulses f, which is determined by the discharge (2n), i.e. in a pack

the multiplicity of the multiplexer 3 f - - ;, the number of pulses

(k) with the same frequency, which is determined by the information capacity of the counter 4 (K) and the trigger 5 connected in series with it, i.e.

K 2 K4.

For example, to get an output with

with frequencies

repetition in packs f and f and with the number of pulses in a pack equal to K, it is necessary to connect the first information input of multiplexer 3 to the single-level bus, and

2n

PI

information entry

multiplexer 3 - to the output of the trigger 6; the number of data bits of multiplexer 3 is set

. „-; counting depth

4 K. K / 2.

 Iog22n; counting capacity

Chika 2 K ka

The signal from generator 1 is fed to the input of counter 2, which controls the state of multiplexer 3, each input pulse at the input of counter 2 corresponds to the duration of the input of multiplexer 3, and the repetition frequency of the signal is 2p of the input frequency periods of the generator. By counting the given Cd pulses, the counter 4 changes the

This is the trigger 5, which changes the counting direction of the counter 4 and goes to zero. After that, the trigger 5 changes its state again, while the counter 4 is ready for counting in the forward direction, and the trigger 6 changes its state and develops the potential of the logical unit to the information input n of the multiplexer 3. Moreover, if the information field of the multiplexer 3 for input signals, it is evenly distributed, its output frequency is doubled with a constant duration of output pulses and becomes equal to 2 f.

The double frequency signal generated at the output of multiplexer 3 is fed to the counting input of counter 4, and the process of generating the output signals is repeated. After the trigger 6 is set to the zero state, the signal frequency at the output of the multiplexer 3 again becomes equal to f ,.

The connection of the group of serial information inputs of multiplexer 3 to the unit-level bus and the groups of serial information inputs of multiplexer 3 to the output of counter 6 can be carried out either by soldering or using keys (for example, toggle switches, elements AND

313

etc.). With the help of this pulse shaper, it is easy to carry out amplitude modulation of pulse bursts with the same frequency. Dp of this sufficient information outputs of the counter 4 is connected to the inputs of the resistor array, the output of which must be connected to the control input of the modulator, the input of which is connected to the output of the multiplexer 3. In addition, amplitude modulation can be performed using any modulating signal generator, synchronizing the operation of which is produced by the signal from the output of trigger 6,

Claims (1)

Invention Formula Shaper pulse generator, containing a generator 374 pulses and the first counter, the information outputs of which are connected to the control inputs of the multiplexer, characterized in that, in order to expand the functional possibilities, two triggers and a second counter are entered, the overflow output of which is connected to the input of the first trigger, the output of which is connected to the direction input accounts of the second counter and the input of the second trigger, the output of which is connected to the information input of the multiplexer. The other information input of which is connected to the unit-level bus, and the output of the multiplexer is connected to the counting input of the second counter and to the input layer, in this case. the output of the pulse generator is connected to the counting input of the first counter.