SU1283953A1 - Pulse shaper - Google Patents

Abstract

The invention relates to a pulse technique and can be used in various synchronization circuits, where it is necessary to generate pulses on both the leading and trailing edges of the triggering pulses. The aim of the invention is to simplify the generator, which is achieved by the fact that the combined inputs of logic elements 2I 6 and 7 are connected to the output of the EXCLUSIVE SHZH element 1, whose inputs are connected: one to the input of logic element 2I 7, and the other to the input 2 of the driver through resis torus 3, the driver also contains a capacitor 4, an inverter 5, output bus 8, 9 and 10. The proposed connection of the pb circuit elements allowed to exclude the "g Schmitt trigger" in the prototype, increase the resistance of the resistor 3 and eliminate the matching of the amplifiers itel 2 Il. ABOUT)

Description

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figure 1

 The invention relates to a pulse technique and can be used in various synchronization schemes where it is necessary to generate pulses both along the leading and trailing edges of the triggering pulses.

Fig. 1 shows the electrical circuit of the pulse former j in Fig. 2, time diagrams of voltages at the nodal points of the circuit,

The shaper contains an EXCLUSIVE OR 1 element, one input of which is connected to the input bus 2 of the driver through a resistor 3, and through a capacitor 4 connected to the common bus and the other input connected to the input bus 2 directly, inverter 5, the input of which is connected to the E bus 2 and the output is with one of the inputs of the first element 2 and 6, the other input is cheaply connected to the output of the EXCLUSIVE OR 1 element, the second element 2I 7, one input of which is connected to the output of the EXCLUSIVE OR 1 element, and the other input is connected to the input bus 2 2I-6, IC KShO ShSh 1, -2and 7 are the corresponding output tires 8 - 10 shaper,

M time diagrams (Fig. 2) introduced the following notation-g: U, 7 pulses at the input of the imager; U is the voltage across the capacitor 4; 11, Ug,

exits 9 - 10 forkbreaker; Up, - level for example; keni threshold srabata for an element of an ENTRY OR 1 "

The shaper is working in the following way,

With the absence of GT5NI c1-tg p. on the input bus 2, the driver for the voltage on the capacitor 4 is equal, and at zero levels, the inputs are the ORIGINAL OR 1, the output level is also zero. The output of the inverter 5 and the single input of the element 2I 6 connected to it is the same level, however, since the combined inputs of the elements 2I 6, 2I 7 are zero, the levels on their outputs are also zero.

With the appearance of the leading edge of the pulse. And with a unit level on the input bus 2, the output of the inverter 5 will be set to zero, which will block element 2I b by one input, and the level at the output of this element on the leading edge of the pulse

will not change. Simultaneously with the leading edge of the input pulse, a unit level is established at the inputs of elements 1 and 2 and 7 connected to the input bus of the imaging unit. As a result, a unit level is set at the output of element 1. Since unit levels act on both inputs of element 2 and 7, a unit level will also be set at its output.

Simultaneously with the leading edge of the input pulse, the charge of the capacitor 4 starts from the source, the input pulses through the resistor 3.

When increasing the voltage of the capacitor to the threshold of the element 1, both its inputs have unit levels, and its output level will be set at its output. Zero Zfoven at this will be installed at the output of element 2 and 7.

In this way, the ia pulses of the two diode tires of the driver from the leading front of the input pulse were formed.

During the duration of the input pulse, a further charge of the capacitor 4 occurs up to a certain voltage, the maximum value of which can be equal to the amplitude of the input pulse and.

At the end of the input Sh Shuls, simultaneously with its falling edge, a bullet level is established on the input bus of the former and the inputs of elements 1 and 2 and 7 connected to it. As a result, a single level is established at the output of inverter 5 and connected to it. 1 because a single level is applied at one input of an IS1SCHOCH / SINGLE element 1 due to the voltage on a capacitor 4, and the other ei o input is set to zero, a single level o is established at the input of element 1 One unit LEVELS act on both inputs of element 2 and 6; So, on his way out, a single level will be established on his way out.

The level at the output of element 2 and 7 will remain zero, since at its inputs there are zero and one levels.

Simultaneously with the termination of the input imp: the capacitor 4 begins to discharge. When the voltage on the capacitor decreases to the value of the threshold .1 of the output at the output

This element will be set to zero, which will lead to the establishment of a zero level at the output of element 2 and 6.

So formed on the two output tires 9 and 8 shaper pulses from the rear edge of the input pulse.

During the pause between the input pulses, the capacitor 4 is discharged and with the arrival of the next impulse at the input of the former, the described formation process will repeat.

The proposed shaper generates pulses on all three output tires: on the output bus 10 - only on the leading edge of the input pulse, on the output bus 8 - only on

9

to the falling edge and to the output strip along the leading and falling edges.

When building a former on chips of one series, the speed of the inverter 5 is always higher than the speed of the element EXCLUSIVE OR 1. This ensures that false positives of element 2 and 6 do not come from the leading edges of the input pulses.

in the shaper, the pulses that control the elements 2I are removed from the single inputs from the EXIT of the EXCLUSIVE OWN, which also performs the main function of forming the output pulses.

Due to this connection of the shaper elements, there is no need for additional elements of the preliminary pulse shaping.

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for the indicated inputs of elements 2I, which are present in the known device. The elimination of the Schmitt trigger, which was known in the device, allows to increase the resistance of the KS circuit resistor, and this, in turn, makes it possible to eliminate the matching amplifier, which is necessary in the known driver.

Claims (1)

Invention Formula A pulse shaper containing two two-input logic elements, one input of which is combined, another input of one logic element is connected to the input bus of the driver through an inverter, a logic element EXCLUSIVE OR, and a serial RC circuit, the second capacitor terminal of which is connected to the common bus, and the outputs of all the logic elements are connected to the respective input driver buses, characterized in that, in order to simplify the driver, the combined inputs of the logic elements are connected to The code of the EXCLUSIVE OR element, one input of which is combined with the input of another logic element and directly connected to the input bus of the driver, the other input is connected to the first capacitor terminal and through the resistor of the RC circuit, to the input bus of the driver, and both logical elements are completed according to the circuit 2I. cfjt / e.2