SU744941A1 - Multiphase overlaying pulse shaper - Google Patents

Description

(54) MULTI-PHASE FORMER OF OVERLAPPING PULSES

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The invention relates to a pulse technique and can be used in the communications industry in the construction of television equipment using charge-coupled devices.

A device for generating 5 pulses, containing five logic elements with a parallel-series connection 1, is known.

The output of the first element is connected to the first input of the second and third elements. The output of the second element is connected to the first ° input of the fourth and fifth elements and the third input of the third element. The output of the third element is connected to the second input of the first, fourth and fifth elements. The output of the fifth element is connected to the first, 5 input of the first element and the third inputs of the second and fourth elements. The output of the fourth element is connected to the second inputs of the second and third elements.

The disadvantages of this device are the impossibility of controlling the frequency of only about 20 pulses, their time to overlap and the change in the number of phases of the output signal. This is due to the principle of operation of the device, based on the presence of positive feedbacks and intrinsic delays of logic elements.

The closest in technical essence and fulfilled functions to the invention is a device for forming clock pulses for charge transfer circuits, containing three / - / C triggers and four logic elements 2.

The synchronization inputs of all the triggers are combined and connected to one of the inputs of all logical circuits. The forward output of the first (second) flip-flop is connected to the input / control of the second (third) flip-flop. And through the match element is connected to the input of the zero setting of the third (first) trigger. The output of the third flip-flop is connected via the coincidence element to the input of the zero setting of the second flip-flop, and the outputs of the first and second flip-flops are connected to an equivalence element whose output is connected to the input / control of the first flip-flop.

The disadvantages of the device include the complexity of its circuit construction, which is determined by the number of connections, elements and their types. The aim of the invention is to simplify the schematic construction of the device. This is achieved by the fact that in a multiphase driver, there are overlapping pulses containing coincidence elements and triggers that are connected so that the direct output of each trigger is connected to the control input of the subsequent trigger and one of the inputs of the corresponding matching element, the output of each of which is connected to the installation input the zero of the previous trigger, and the other inputs are combined and connected to the synchronization inputs of all the triggers, with the direct output of the first trigger through the corresponding element of the match n with the installation input of the last trigger zero and the inputs to all the triggers are connected to the common 1 pin, the inverse outputs of all the triggers, except the last one, are connected to the control input of the first trigger. FIG. 1 shows the structural scheme of the proposed shaper; in fig. 2 - time diagrams of his work. The multiphase overlapping pulse generator contains three (AND / OR more) flip-flops 1, 2, 3, the synchronization inputs of which are combined and transmitted to one of the inputs of elements 4, 5, 6, and the synchronization pulse input 7. The direct outputs of the flip-flops 1, 2 are connected to the control inputs, respectively, of the flip-flops 2, 3, other inputs of the elements 6 and 4, coincidence, and output contacts 8, 9. The direct output of the trigger 3 is connected to another input of the coincidence element 5 and the output contact 10. The outputs of the elements 4, 5, 6 matches are connected to the inputs for setting zero triggers 1, 2, 3, respectively. The inverse outputs of the flip-flops 1, 2 are connected to the control inputs of the first flip-flop. Other control inputs of the flip-flops 1, 2, 3 are connected to the input terminals I, 12, 13, and the inputs K. of all the flip-flops are connected to a common panel. The operation of the device is as follows. The contact 7 of the synchronization of the device from an external generator receives a sequence of ill-pulses, and the contacts 11, 12, 13 of the control of the stop of the device receive the enabling levels. For definiteness, suppose that the initial state of the triggers is "011" (Fig. 2, & c, d). The first impulse (Fig. 2, a) by a positive front through the element 5 of coincidence (Fig. 2, f) at the installation input transfers trigger 2 to the zero state (Fig. 2, c) and does not change the state of triggers 3. From this moment Time trigger 1 is prepared on the control input to switch to state "1. The negative front of the first pulse (Fig. 2, a) at input C synchronously transforms trigger 1 into one state (Fig. 2,} thus preparing trigger 3 but setting input zero for translation to zero state and trigger 2 at input C synchronization to one state. Trigger 2 from this front does not switch, since at its control input it prohibits the level from the direct output of trigger 1, which changes its state after the end of the negative front of the first pulse. The second pulse (Fig. 2, a a) positive front through ale The match 6 element (Fig. 2, o) at the input of the zero setting translates trigger 3 into the zeroE: th state (Fig. 2d), and a negative front on the synchronization input C, trigger 2 into a single state (Fig. 2, c). Trigger 1 does not change its state, since it is closed on the control input of the prohibiting wave from its own inverse output. Trigger 3 also does not change its state when it is affected by the negative front of the second pulse, because it is closed along 1; the output of trigger 2, which is switched to one with of hundred terminates after the second pulse. From this time point, trigger I is prepared on the setup input zero for switching to the zero state, and trigger 3 on the control input is set to one. The third impulse (Fig. 2, a) with a positive front through the element 4 of coincidence (Fig. 2, e) at the input of the zero setting transfers trigger 1 to the zero state (Fig. 2 2 with a negative front at synchronization input C converts trigger 3 to one state (Fig. 2, d). Trigger 2 does not change its state, since it is closed by forbidding, the HM level arriving at its control input from the direct output of the trigger. Trigger 1 also does not change its state: .-. actions of the negative front of the third impulse, since it is closed at the entrance of an angle E) to prohibiting The level from the inverse output of flip-flop 2, which switching to one state ends after the end of the third pulse.Since this point, flip-flop 2 is prepared on the setup input zero for switching to the zero state, and the trigger i on the control input is in e The fourth pulse (Fig. 2, a) by a positive front through the coincidence element 5 (Fig. 2, f) on the input of the zero setting translates trigger 2 into the zero state (Fig. 2, c), and a negative front at the input C of the synchronization translates trigger i into a single state (Fig. 2, S). The trigger 3 does not change its state, since it is closed by the prohibiting level. The control arrives at its input from the direct output.

trigger 2. Trigger 2 also does not change its state when exposed to the negative front of the fourth pulse, since it is closed at the control input of the inhibitory level from the direct output of trigger 1, whose switching to one state ends after the end of the fourth pulse. From this point in time, trigger 3 is prepared on the setup input zero for switching to the zero state, and trigger 2 on the control input is set to one.

Fifth pulse (Fig. 2, a) with a positive front through coincidence element 6 (Fig. 2, Q) at the setup input zero sets trigger 3 to the zero state (Fig. 2a% and negative edge at synchronization input C switches trigger 2 single state (fig. 2, c).

The trigger I does not change its state, since it is closed by the prohibiting level, arriving at its control input from its own inverse output. Trigger 3 also does not change its state when exposed to the negative edge of the fifth pulse, since it is closed at the control input of the inhibitory level from the direct output of trigger 2 whose switching to one state ends after the end of the fifth pulse. From this point on time-i, the trigger 1 is prepared on the input of the zero setting for switching to the zero state, and the trigger 3 on the control input is set to one.

Next, the pulse shaping process repeats in the described sequence and at the output contacts 8, 10, 9 a sequence of overlapping of their pulses is formed in accordance with the timing diagrams of FIG. 2

When the shaper is turned on, the triggers can take on different states. If all the triggers take the zero initial state, then the operating mode of the driver is set with arrival of synchronization pulses on its contact 7. If all the triggers take a single state, then the first input pulse will transfer them to the zero state, after which it will enter the operating mode. In any other initial conditions, the operating mode of the former is provided with the arrival of the first one after switching on the synchronization pulse.

With the arrival of one of the contacts, for example, contact 1 (12, 13) of the control of the inhibitory level (stop signal) at any time, the formation of the full triad of pulses is completed and fixed in the state "01 (" 100,).

It is assumed that the stop signal enters at the time point b (Fig. 2, a) on contact P. The fourth pulse by the positive front through element 5 coincides (Fig. 2, f) according to Blo, ;; the zero setting translates trigger 2 to the zero state (Fig. 2, c}). The negative front of this and subsequent pulses does not translate the trigger I B. The short state is because

on his contact is governed. And the prohibiting level acts. Trigger 2 retains the zero state, since at its control input the prohibiting level from the direct trigger output. The trigger 3 is fixed in one state, having at its input

On the control, the prohibiting level from the direct output trigger 2. The fifth and subsequent pulses do not change the state of the form-breaking trigger and this state “001 until the end of the control pulse is preserved.

  the stop.ch arrives at control pin 11, for example, at time ti, the driver operates without change until time t 0, after 0, which stops in the previously described sequence. Similarly, the device is also stopped in two other states "100" and when the stop signals are applied to the 12 and 13 input contacts at any time, respectively.

of time.

The proposed device is easier known. It is COCrOi; FROM 1BVX TRSHOV only

elements / -K triggers and elememetytov coincidence. In addition, the increase in the number of phases of the formed sequences does not change the number of types of utilized s, 1 of 5 s, and the device is less powerful.

Simplifying the schematic construction of the device reduces energy consumption and reduces its production, which is very important when using mass devices, which become equipment with a charge connection, in addition, y;:; ь Lenka the number of elements, their types; the number of links increases the reliability of the device for forming sequences of overlapping PULSES.

Foomila chosobteni

Multiphase D1; The overlapping puller has a pulse of kx containing elements of the same; and triggers, which are connected so that the direct output of each trigger is connected to the control input of the subsequent trigger n to one of the inputs of the corresponding match element, the output of each of which is connected to the installation input zero of the previous Tps-rrrepa, and the other inputs are vol. to the synchronization inputs of all the triggers are connected, with the direct output of the first trigger-lepea, the corresponding matching element connected to the input of setting the last trigger and inputs K, all the triggers are connected to the common bus, characterized in that In order to simplify, the inverse outputs of all the triggers, except for the latter, are connected to the control inputs of the first trigger.

Sources of information taken into account in the examination 1. Japanese patent number 50-12874, 98 (5) B 23, published. 1975.

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2. Patent of France No. 2258052, cl. H 03 to 3/12, publ. 1975.

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Claims (1)

Claim Much phase d: o: m and r ave the body of overlapping impulses. containing coincidence elements and triggers that are connected so that the direct output of each trigger is connected to the control input of the subsequent trigger and to one of the inputs of the corresponding coincidence element, the output of each of which is connected to the zero setting input of the previous trigger, and the other inputs are combined and connected to the inputs synchronization of all triggers, and the direct output of the first trigger through the corresponding coincidence element is connected to the zero input of the last trigger and the inputs of all triggers are connected to common bus, characterized in that, in order to simplify the inverse outputs of all the triggers, with the exception of the latter, are connected to the control inputs of the first trigger.