SU790193A1 - Pulse shaper - Google Patents

Description

one

The invention relates to a pulse technique and can be used in automation devices and computations. telnoy technology.

Known pulse shaper, - containing the trigger, the delay element, the elements AND NOT and the elements are NOT 1J.

A disadvantage of the known device is low noise immunity.

The closest technical solution to the invention is a pulse shaper comprising a trigger, a delay element, and an AND-HE 2 element.

A disadvantage of the known technical solution is the low noise immunity when exposed to its input signal, the duration of which is less than or equal to the switching time of the input trigger.

The purpose of the invention is to increase the noise immunity of the pulse former.

The goal is achieved by the fact that the pulse shaper, containing a trigger and a delay element, the output of which is connected to the first input of the first one. h; lend is NOT, and a single trigger input is connected to the input bus; 30

the element is NOT and the second element is NOT-NOT, the output of which is connected to the second input of the first element AND-NOT, the output of which is connected to the first input of the second element AND-NOT and to the zero input of the trigger, the zero output of which is connected to the second input of the second element AND-NOT and through the NOT element to the input of the delay element.

The drawing shows a circuit diagram of the proposed pulse generator.

1) the pulse driver contains a trigger 1, a NOT element 2, a delay element 3, an AND-NO 4-5 element, an input bus 6 and an output bus 7.

The pulse shaper operates as follows.

In the initial state, the inputs of the NAND 4 element are at the zero level, and at the output of the NAND 4 element and the output bus 7, the unit level.

When a trigger pulse arrives at the input bus 6 of the pulse generator, trigger 1 is set to one, as a result of which the voltage drop from the zero output of trigger 1 is transmitted to the first input of the AND-NO element 4 through the HE 2 element and the delay element 3, and the second input element AND-NOT 4 - through the element AND-NOT 5.

When the unit levels at both inputs of the AND-HE 4 element on the output bus 7 coincide, the zero level, which enters the AND-HE element 5, blocks its first input from the signal from the trigger output 1 and simultaneously resets the trigger 1, after which the pulse shaper is reset. The cycle of operation of the imager ends there.

When pulsed impulse pulses arrive at the input bus b of the driver, the duration is less than the trigger 1 triggering time, this disturbance to the output bus 7 does not pass due to its blocking through the second input of the AND-HE element 4.

When the duration of the triggering impulse is greater than the duration of the shaper's cycle, the latter passes into the self-oscillatory mode.

Thus, the present invention allows to form a series of pulses with a duration equal to the delay time of the delay element when the trigger pulse duration is longer, the delay element is longer, and also to form a single pulse when the trigger pulse duration is less than

delays of the delay element, thus excluding the passage of interference from the driver input to its output when the duration of the interference is shorter than the trigger response time.

Claims (2)

1. USSR author's certificate No. 451184, cl. H 03 K 5/13, 1972. 2.Panov Yu. V. Shaper of rectangular pulses. Experience exchange in the radio industry, 1975, no. 3, s. 71 (prototype). 1Nt} 7 Mr