SU624357A1 - Synchronized pulse shaper - Google Patents

Description

The invention relates to automation and computer technology and can be used in pulse shaping devices.

Known drivers of synchronized pulses, containing triggers and elements And ij. However, the known devices are complex and unreliable in operation. Also known shaper ooochnoi pulses, synchronized clock frequency, socializing trigger trigger and three elements And, with the first input of the first element And connected to the information bus of the second - to the bus clock pulses, the output of the first trigger through the second element And connected to the first input of the second trigger and the first The input of the third element is And, the second input of which is shown to the output of the second trigger, and the output to the first input of the first trigger 2j. This known device does not have sufficient noise immunity, since the disturbance, whose duration is shorter than the duration of the clock pulse, has been detected at the input of the device at the same time

but with a clock pulse, is perceived as an information signal.

The aim of the invention is to improve noise immunity. In the described organizer, this is achieved by the fact that the information bus in it is connected to the second inputs of the triggers and to the third input of the third element And, the third input of the first element And is connected to the output of the third element And, and the output to the third input of the second element And connected to the input bus.

On (Jsir. 1 the electrical circuit of the described generator is presented; Fig. 2 is a timing diagram explaining its operation.

Information bus 1 and clock pulse bus 2 are connected, respectively, to the first and second inputs of the first element I 3, the output of which is connected to the single input of trigger 4 and to the input of the second element 5, the second input of element 5 is connected to the forward output of trigger 4 and the output is to the single input of the trigger 6, to the first inlet of the And 7 element and the output bus 8, the second inlet of the And 7 element is connected to the other output of the trigger 6, the third to the zero input of the trigger 6, to the information bus 1 and to the second zero input trigger 4, first zero input tr ggera 4 is connected to a third input of the elements Ta and 3 and to the output of AND gate 7. In the initial state on the data bus 1, the low voltage level. The triggers 4 and 6 are in the zero state at the output, respectively, the prohibition signal is sent to the elements 5 and 7. The third input element And 3 receives the resolution from the output of the element 7. With the appearance on the information line, not one signal with a high voltage at the output of the element And 3 appears with a low voltage that prevents the signal from passing through the element 5 and flips trigger 4. With the arrival of a low level of the clock frequency on the bus clock 2 at the output of the element And 5 there is also a low voltage, prohibiting the passage of a signal through the element And 7 and throwing the trigger 6. The impulse at the input of the element I 3 at the output of the element I 5. is a high voltage that generates a signal with a low voltage at the output of the element And 7 with a low voltage that is when the TynaesT is at zero trigger input 4, transferring it to zero state at the output. The trigger 6 is set to zero at the output when a low level voltage appears on the data bus 1. Thus, the shaper returns to its original state. Consequently, when the voltage on the information bus 1 changes from a low level to a high one on the output bus 8, a single impulse of blue signal occurs.

With a pause between the first and second clock pulses in the presence of a high voltage on the information bus, In the case of a disturbance signal on the information bus 1, the sync pulse on the output bus 8 does not occur, since simultaneously with the end of the interference signal, the trigger 4 is set to zero is at the output, and the first input element And 5 appears prohibitory signal. In comparison with similar known devices, the described synchronized pulse shaper has a higher noise immunity. Summary of the invention The synchronized pulse shaper containing two triggers and three I elements, the first input of the first element I is connected to the information bus, the second one is connected to the clock pulse bus, the output of the first trigger through the second element I is connected to the first input of the second element And, whose second entrance is under-. The key to the output of the second trigger, a. the output is to the first input of the first trigger, characterized in that, in order to increase the noise immunity, the information bus is connected to the second inputs of the flip-flops and to the third input of the third element AND, the third input of the first element AND is connected to the output of the third element AND, and the output to the third input the first trigger and to the second input of the second element And connected to the output bus. information received Sources of expertise: into account when the USSR certificate 1. Avtorskoe H 03 K 5/01, 1976. No. 525234, cl, USSR certificate 2, Author's N OZ K 5/02, 1976, NO 514426, cl.

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