SU646428A1 - Square-pulse train generator - Google Patents

Description

(54) GENERATOR OF PUTS OF RECTANGULAR PULSES

The drawing shows the conventional aperture pulse generator circuit.

The generator contains a standby multivibrator 1, an RS-trigger 2, a counter 3, a match element 4 and a master oscillator 5.

The multivibrator with output 6 is assembled on impulse bridge elements (IME) 7 and 8, which are made with a reference voltage and half-bridge formed by resistor 9 and capacitor Yu (in IME 7) and resistor 11 and capacitor 12 (. IME 8).

The IME 7 and 8 also includes transistors 13 and 14, diodes 15-17, and the diode 18 in the trigger circuit of the anode is connected to the direct output 14 of the S-flip-flop 2.

In the initial state of the multivibra, the torus is braked by the potential applied to its input from the trigger output, and the generator is in standby mode. The cycle of work riSHepaTqpa packs begins with the formation of the driving generator 5 control single pulse. It is fed to the S-input of trigger 2 and overturns it. Therefore, the trigger disables the multivibrator. 1 n causes in it the appearance of relax UiH. At the output 6 of the multivibrator, square-wave pulses are formed, fed to counter 3. The outputs of all bits of the counter are connected to the inputs of the coincidence element 4. After passing through the counter, the number of pulses at the top of the coincidence element is generated and a control pulse is generated, which is fed to trigger input 2, returning it to its original position at which the multivibrator is inhibited,

In the absence of excitation, transistors 13 and 14 of IME 7 and 8 are closed. The capacitor 12 to the reference voltage, which is fixed by the diode 15 ,. At the output of the trigger 2, there is zero potential, and therefore the capacitor 10 is completely discharged through the diode 18, and the IME 7 is ready to run.

When flashing trigger 2, diode 18 is closed and capacitor 1O is charged through resistor 9. Charging current opens transistor 13, which forms the first positive pulse at the output of IME 7. Through saturated, transistor 13 discharges capacitor 12, preparing for IME 8.

When capacitor 10 is discharged to the reference voltage, latching diode 16 will open and the charging current will stop. Therefore the transistor will close

13 and the formation of the first pulse is complete.

After that, the diode 17 will close and the capacitor 12 will begin to charge through the resistor 11, the current will open

a transistor 14, which will form a positive pulse at the output 6. The capacitor 10 is discharged through the transistor 14, preparing to start the IME 7. As a result, the self-oscillating mode is set in the multivibrator,

From the outputs of IME 7 and 8, two synchronous phase shifted sequences of rectangular pulses are removed.

The duration of the pulses and, consequently, the period and duty cycle of the sequences depend on the resistance of the resistors 9 and 11, and the capacitors of the capacitors 10 and 12 during the transitions

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From output 6, the pulses are fed to counter 3, From the output of each discharge counter, the pulses go to the inputs of the coincidence element 4 (in the drawing -.

The two-digit counter and two-input match element are shown). After the fourth pulse of the multivibrate 1, from the input of the coincidence element 4, a pulse is applied to R - the trigger 2 input, to return it to the initial state, C and the trigger output are given a pulse to set the counter to the initial state.

Thus, the generator of packs of rectangular pulses provides for the formation of two synchronous and phase-shifted packs of pulses with a given number of pulses in a pack, when the beginning of the first pulse of one of the packs is synchronized with the control pulse.

Claims (2)

Invention Formula The generator of packs of rectangular infrared pulses containing a waiting multivibrator is performed on the basis of two pulsed bridge elements with a diode in the trigger circuit, R6 is a trigger whose installation input is connected to the master oscillator, the inverse output is from the input of the counter zero, and c6pt with the output of the coincidence element whose inputs are connected to the outputs of the counter bits, which is different in that, in order to improve synchronization accuracy, the output of the waiting multivibrator is connected to the counter input of the counter, and the anode of the diode in the starting circuit It is connected to the direct output of the RS trigger. 64 86 Sources of information taken into account during the examination 1. Author's certificate N9 513479, cl. H 03 K 3/64, 06.02.75. 2. Certificate of author No. 400012, cl. H 03 K 3/64, 11.11.71.