SU674208A1 - Pulse train envelope shaper - Google Patents

Description

The invention relates to a pulse technique. The device is intended to form with a high degree of accuracy a pulse enveloping a series of pulses, and can be used in telemetry systems and automation devices.

A pulse shaper is known that envelopes a series of pulses, whose operation is based on the principle of charge - discharge of the capacitance of an integrating RC circuit 1. The process of forming a pulse enveloping a series of pulses occurs due to the integration of a burst, subsequent amplification and limitation.

In connection with the presence of monotonously increasing and monotonously decreasing exponents, characteristic of the charge and discharge of the capacitance of the integrating circuit, the front and rear edges of the formed pulse, i.e. the envelope of the pulse train (regardless of the voltage limiting level) is transmitted with significant temporal and phase distortions.

The closest to the technical essence of the invention is a shaper, which carries out (with a constant period of pulse following in a pack) the process of forming

pulse, the envelope of a series of pulses 2. It contains a series of impulses connected in series, a kip-relay, a transistor switch, an integrating circuit with a current-stabilizing element. When a pulse enveloping a series of pulses is sensed, due to the charge discharging the capacitance of an RC circuit, the fronts of the output signal are significantly tightened, as a result of which temporal shifts of the fronts of the pulse enveloping the pulse series appear.

The aim of the invention is to increase the accuracy of the formation of a pulse enveloping a series of pulses.

This is achieved by introducing into the pulse generator enveloping a pulse train containing serially connected reference frequency generator, key, counter and trigger, a setting pulse shaping unit, census block and transfer setting device, whose outputs through the census block are connected to the remaining n meter inputs respectively. Moreover, the output of the reference frequency generator is connected to the first input of the forming unit

the setup pulse, the first output of which is connected to the n + 1 th input of the census block, and the second output is connected to the second input of the trigger, the output of which is connected to the second input of the key.

The functional diagram of the pulse former is shown in the drawing. It contains an input bus 1, a reference frequency generator 2, a key 3, a counter 4, a period master 5, a census block 6, a setup pulse shaping unit 7, and a trigger 8.

The shaper works as follows.

The first half-cycle of the reference frequency pulse, which binds the first impulse of the series coming from the input bus 1, makes a forced recording from the setpoint 5 through the census block 6 into the counter 4 of the return code (including some addition) of the period T of the impulses of the series. The second half-cycle triggers trigger 8, at the output of which a pulse enveloping the series is formed. At the same time, the key 3 input opens and the reference frequency pulses fill counter 4.:

Before the counter overflows, the second impulse of the series arrives from the input bus 1 to the formation unit 7. The first half-cycle of the reference frequency pulse, which binds the second impulse of the series, affects the control input of the census block 6, forcibly sets the return code in counter 4 (with some additions) period T kmpulso series. The second half period of this reference pulse confirms the inverted state of trigger 8, and thus, the process of forming the trigger of the pulse enveloping the series with a trigger continues.

This process continues until a series of pulses from the input bus is completed. The arrival of the series pulses in the Forming Unit 7 stops. At the same time, having counted out the last period of the series (including some addition), counter 4 overflows. The counter overflow pulse returns to its initial state the trigger 8, which, acting on the control input of the key 3, closes the counter input. The impulse that surrounds the impulse series ends. With the appearance of the new impulse of the new series, the process is repeated.

Formula. the invention

A pulse generator enveloping a series of pulses containing a series-connected reference frequency generator, a key, a counter and a trigger, characterized in that, in order to improve the accuracy of the formation, an installation pulse shaping unit, a census unit and a period setting unit, which EXIT through which the census is connected to the remaining n inputs of the counter, respectively, and the output of the reference frequency generator is connected to the first input of the setup pulse formation unit, the first output of which is connected to + 1-th entry T1erepisi block, and a second output coupled to the second input of the flip-flop, whose output podklyuch1gn to the second input key.

Sources of information taken into account in the examination

1. Chukhoki Ya. S. Pulsed digital devices, Owls. radio, 1973, p. 32-4J.

2. Authors certificate of the USSR N 369577, cl. G 06 G 7/18, 1972.