SU790183A1 - Pulse generator - Google Patents

Description

(54) PULSE GENERATOR

The invention relates to the field of pulsed technology, in particular, to devices for forming pulse sequences.

Known pulse generator containing the trigger, the elements AND, OR, the delay line, the inverter, the element of the ban 1.

A disadvantage of the known generator is the difficulty of switching from the mode of generation of paired pulses to the mode of generation of single pulses while maintaining the specified temporal ratios.

The closest technical solution is a pulse generator containing a master oscillator, a standby multivibrator, a shortening chain, an amplifier limiter, and an OR Q2 circuit.

The disadvantage of this generator is the impossibility of switching it to the mode of generating single pulses with a follow-up period equal to the delay in the pair of pulses, without tuning, the follow-up period of the pulses of the master oscillator. At the same time, it is difficult to control the generator, since during each shift

operating mode with the generation of paired pulses to generate single pulses and vice versa, it is necessary to tune the frequency of the master oscillator, which significantly reduces the functionality.

The purpose of the invention is the expansion of functional capabilities.

10 The goal is achieved by the fact that a pulse generator containing a master oscillator, a pulse expander, an OR element and a mode switch are entered.

15 synchronized additional generator, RS-trigger and element And, and the output of the generator is connected to the R-input of the RS-hrigger and through the mode switch

20 with the synchronization input of an additional generator, the output of which is connected to the S-input of the RS flip-flop, with the first input of the And element and through the mode switch with the output

25 by the generator bus, the inverting output of the RS flip-flop is connected to the first input and through the pulse expander to the second input of the OR element, the output of which is connected to the second input of the AND element, the output of which is connected to the output bus of the generator through the operating mode switch.

In a pulse generator, the delay times in a pair and mycoles in the mode of generation of paired pulses and the follow-up period of single pulses in the mode of generating single pulses are determined by the same block — an additional synchronized generator.

FIG. 1 shows a structural diagram of a pulse generator; in fig. 2 - time diagrams that show his work.

The pulse generator contains a master oscillator 1, a switch of 2 operating modes, a synchronized generator 3, an RS flip-flop 4, an expander of 5 pulses, a two-input element OR 6, and a two-input element AND 7.

The scheme works as follows. In the mode of generating paired pulses, the switch 2 is in the lower position (as shown in Fig. 1), so that the synchronization input of the generator 3 is connected to the output of the master oscillator 1, and the output bus is connected to the output of the element 7. The pulse pair period is set by the driver The generator 1 (Fig. 2a) a sets the delay time between the first and second pulses of the pair equal to the oscillation period of the generator 3. In this case, the generator 3 is periodically synchronized by the pulses of the master oscillator 1 (Fig. 26). The pulse duration of the master oscillator 1 is set longer than the pulse duration of the oscillator 3. At the same time, the RS flip-flop 4, regardless of its initial state (after turning on the supply voltage), generates positive pulses at its non-inverting output, the duration of which is equal to the oscillation period of the oscillator 3 (Fig. 2c). ). The pulse expander 5 is triggered by the falling edge of the pulse of the RS flip-flop 4 and generates a pulse whose duration must be greater than the pulse duration of the generator 3, but less than the minimum oscillation period of this generator (Fig. 2 g). In this case, at the output of the element OR b, a pulse is formed, the duration of which ensures that the element 7 transmits only a couple of pulses in the home period of oscillations of the master oscillator 1 (Fig. 2 d, e).

When switching switch 2 to the upward position in the timing of generator 3 is turned off, the output of this generator is connected directly to the output bus. With this, single pulses are generated at the output, the follow-up period of which is determined by generator 3 and is equal to the delay time in a pair of pulses.

Q The proposed pulse generator favorably differs from the known generators in that the second synchronized generator simultaneously determines the delay time in a pair in the mode of generation of pair pulses and the period

5 oscillations in the mode of generation of single pulses. This significantly simplifies the generator control when changing generation modes, since there is no need to tune the frequency of the master oscillator, and also increases the accuracy of the time parameters of the device.

Claims (2)

1. USSR author's certificate number 451172, cl. H 03 K 3/02, 1972. 2.Itskhok Ya. S., Ovchinnikov N. I. Pulsed and digital devices, M., Sovradio, 1972, p.528, fig. five Vpod Fm.1