SU1401579A1 - Pulse shaper - Google Patents

Abstract

The invention can be used to extract useful information from a short circuit of a pulse train. The purpose of the invention is to increase the reliability of work. The pulse shaper contains a comparator 5 which inverts and does not invert the sources 3 and 4 of the reference voltage and the capacitor 5. A voltage divider 7 is inserted into the device, and the comparator t is made strobe with memorization, 2 Il.

Description

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The invention relates to a pulse technique and, in particular, can be applied to extract useful information from a stream of pulse sequences coming from nuclear radiation detectors, photon counters, etc.

The purpose of the invention is to increase the reliability of work.

FIG. 1 is an electrical circuit diagram of the device; Fig. 2 shows timing diagrams explaining the operation of the device.

The pulse shaper contains a comparator 1, the non-inverting and inverting inputs of which are connected respectively to the input bus 2 and the first source 3 of the reference voltage, the second source 4 of the reference voltage, the capacitor 5, the first possessor connected to the output of the comparator 1 and the output bus 6, divider 7 voltage, and the comparator is made gated with memory, its gate input is connected to the second plate of the capacitor 5 and through the voltage divider 7 to the bus of the second source 4 of the reference voltage,

The shaper works as follows,

The mode of operation of the comparator 1 is selected so that pulses are fed from the input bus 2 to the non-inverting input (FIG. 2a). A signal from the first source 3 of the reference voltage is supplied to the inverting input. A logic zero level is set at the gate input of the comparator 1, which ensures that the input pulse passes freely at the output 6 of the comparator 1. The required level is set using a voltage divider 7. If a positive polarity pulse appears on the input bus 2, exceeding in amplitude the value of the first source 3 of the reference voltage (FIG. 2a) set at the inverting input of the Comparafora 1 (FIG. 2a), it goes unhindered to the output of the comparator 1 (FIG. 26). The voltage drop at the output of the comparator 1 (Fig. 26) through the capacitor 5 enters the gate 1 of the comparator 1 (Fig. 2c) and puts it into the memory mode. If the duration of the pulse, the pulse from the input bus 2 is less than the constant time T (FIG. 2a I) formed by the capacitance of the capacitor 5 and the total resistance in parallel

AC resistors of the divider 7, then the output of the output pulses in the time interval, (Fig, 26) is determined by the time constant, since the current

The discharge of the capacitor 5 supports at the gate input of the comparator 1 level, which holds the comparator 1 in the memory mode. If the duration of the input pulse t g exceeds the time constant (G (Fig 2a, II), the formation of the output pulse is prolonged by the input signal through the comparator 1, which is switched to the tracking mode. Thus, the amplitude

the discriminator-pulse former expands short input pulses up to the normalized minimum duration cG and freely passes pulses, the duration of which exceeds

her,

In the considered case, the amplitude discriminator-pulse shaper is operational when the input pulse is positive polarity to the non-inverting input of the comparator 1, which exceeds the amplitude of the first reference voltage set at the input,

In the case of negative-polarity input pulses, the circuit operates in the same way, if the signals are inverted at the inverting and non-inverting inputs of the comparator (FIG. 1),

In a particular implementation of the amplitude discriminator-pulse former, gated comparators of the TTL-K597CA2 type or the ECL-K597CA1 type schemes, the K597CA2 comparators are converted into a memory mode when a positive-polarity pulse is applied to the –9, a K59T mode, is used in the memory mode, when a positive input is applied to the gating input, the K599 comparators will be replaced by one, a595, K597C2 will be assigned to a memory card when a positive-polarity pulse is applied to the gating input of the K597CA2 comparators. rnness to the gate input, t, 6, in the first case, the gate signal is removed from the non-inverting output of the comparator, in the second - from the inverting,

Claims (1)

Invention Formula A pulse shaper containing a comparator, the inverting and non-inverting inputs of which are connected respectively to the first source 3 the reference voltage and the input bus, a second voltage source and a capacitor, the first plate connected to the output of the comparator and the output bus, characterized in that, in order to increase the reliability of its operation L / I itr f; f-fif f A voltage divider is introduced, and the comparator is gated memory, its gate input is connected to the second capacitor plate and, via a voltage divider, to the bus of the second source of reference voltage. "Ts T 1