SU1637007A2 - Pulse driver - Google Patents

Description

The invention relates to a pulse technique, in particular to a device for generating pulse signals. The aim of the invention is to improve the reliability of the device

2

by increasing its noise immunity. This goal is achieved by introducing between the first input of the second 2 and the output of the first 1 elements AND-NOT an additional element And 5, the second input of which is connected to its first input through the additional delay element 6. In addition, the pulse former includes the first delay element 3 and asynchronous trigger 4. The input bus of the driver is connected to the third input of the first element AND-NOT 1, and the output bus is the output of the second element AND-NOT 2. 1 Il.

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1637007

The invention relates to a pulse technique, in particular to devices for the formation of pulse signals, and is an improvement of the invention according to the author. No. 815880.

The purpose of the invention. · - Improving reliability by increasing its noise immunity.

The drawing shows the functional diagram of the shaper. The shaper contains the first element · AND-HE 1, the first input of which is connected to the output of the second element AND-NOT 2 and through the first element 3 of the delay c. its second input and the installation input of the asynchronous trigger 4 connected inverse output with the second input of the second element. AND-NOT 2. The third input of the first element AND-NOT G is connected to the input bus of the driver, and the output is to the reset input of the asynchronous trigger 4 and through the additional element 5, the second input of which is connected to the first input, through the second delay element 6, the first input of the second element AND-NOT 2.

The shaper works as follows.

In the absence of an input pulse (positive potential na.vhodnoy bus) at the output of second AND-NO 2 ^I output generator is also present a positive potential, and an asynchronous trigger 4 is retained in a zero position.

When a short negative pulse of interference appears on the input bus of the shaper (the duration of the interference does not exceed the propagation time of the signal in the second delay element 6), a positive pulse signal appears at the output of the AND-HE element I. Impulse interference does not pass through an additional element And 5, since at its second input the signal from the output of the second element b of the delay appears only after the end of the pulse from the output of the first element AND-NOT. 1 and, therefore, does not appear on the output bus of the driver.

When an input signal (zero level at the input bus) appears at the output of the AND — NOT element. 1, a positive potential appears, which, after the delay time of the delay element 6, is formed at the output of the element AND 5 and tears off the element AND IS NOT 2.

At the output of the element IS-NOT 2 and, therefore, on the output bus of the driver, this produces zero; input signal.

When entering the input of an AND-KE 1 element, the zero potential duplicates the input signal and, passing through the first element 3 delays, i.e., through time

sets asynchronous trig- ·. Ger 4 in a single state. At the same time, the specified signal by the second input of the element AND-NOT 1 duplicates the input information. After another time, the second input of the element IS-NOT 1 and the single input of the asynchronous trigger 4 produces a positive potential, which means the driver is ready for the next cycle, i.e. readiness to form a new impulse.

The duration of the output zero signal on the output bus is determined by the propagation delay time of the signal in the 3 delay element. Moreover, when a noise pulse arrives at the input bus of the driver, it does not react to them for two Souen, as it does not respond to pulses whose duration does not exceed the propagation delay time in the delay element 6.

Thus, the shaper generates pulses of variable duration (depending on the characteristics of the applied first element ^ of the support) and is more reliable when working with noise-suppressing signals, for example, when operating from any contact. devices. In addition, the shaper can be used as a limiter of the repetition frequency of the input pulses, i.e., as a digital low-pass filter.

Claims (1)

Claim Pulse generator po'avt. St. No. 815880, which means that, in order to increase the reliability of the device by increasing its noise immunity, an additional element AND is included between the first input of the second and the output of the first AND-AND element, the second the input of which is associated with its first input through an additional delay element.