SU1053281A1 - Time pulse discriminator - Google Patents

Abstract

TIME SELECTOR OF PULSES, made on the basis of a transistor element AND on two series-connected transistors of the same type of conductivity, in order to form the output signal on the falling edge of the reference pulse, regardless of the phase shift of the selected and reference pulses, a threshold element and a capacitor, wherein a capacitor is connected between the transistors and is connected to one of the outlets with the emitter of the transistor connected by the collector to the power bus and to the input of the threshold elec cient, and the other output - with the transistor collector connected to the emitter of the common bus and via a resistor to the power bus. (L

Description

The invention relates to a pulse technique and is intended to form a signal when two pulses coincide.

A device is known for the coincidence of two pulses, which contains two triggers, the OR element and the element

And CiJ ..

The disadvantage of such a device is that it does not select a pulse at the output if the signal being analyzed came before the reference signal.

Known time selector pulses made .. on the basis of the transistor element And C2J.

However, such a selector does not provide for the formation of a pulse on the trailing edge of the reference pulse for any hours of regular matches.

The closest in technical essence to the invention. is a time, pulse selector, made on the basis of the transistor element AND on two C 3 J transistors.

A disadvantage of the known selector is the impossibility of generating an output signal regardless of the phase of the pulse shift.

: The purpose of the invention is to form an output signal on the falling edge of the reference pulse, regardless of the phase of the selection and reference pulses.

The goal is achieved due to the fact that in the time pulse selector, made on the basis of a transistor element, And on two series-connected transistors of the same type of conductivity, a threshold element and a capacitor are introduced, and a capacitor connected between the transistors is connected to one of the terminals, podklyuchennogo collector to the power supply bus, and with the input of the threshold element, and the other output - with the collector of the transistor connected by the emitter to the common bus, and through a resistor with the power bus.

FIG. 1 shows an electrical circuit diagram of a time pulse selector; in fig. 2 timing diagrams of the reference, analyzed and output pulses.

The time selector contains an element And, performed on two transistors 1 and 2, between capacitors 3. is connected to the capacitor 3. The source 4 of the analyzed pulses and the source 5 of the reference pulses are connected to the bases of the transistors 1 and 2. The collector of transistor 1 is connected to the power supply bus 6, which is also connected via resistor 7 to one of the outputs of capacitor 3 connected to the collector of transistor 2, the emitter of transistor 1 connected to another output of capacitor 3 via threshold element 8 is connected to element 0 9 load, and the emitter of transistor 2 is connected to a common bus.

The selector works as follows.

In the absence of pulses from sources 4 and 5, transistors 1 and 2 are in the cutoff region. When pulses from sources 4 and 5 are received at different times, the charge of capacitor 3 is impossible, since the capacitor charge circuit is open. When the pulses J and DQP (Fig. 2) coincide in time, the transistors 1 and 2 are in a saturated state for some time.

simultaneously, and the capacitor 3 is charged before the voltage of source 6.

Conductive voltage threshold. element 8 is chosen greater than the voltage of source 6; therefore, during charging of capacitor 3, the output voltage is zero. In

time of the falling edge of the support Porsa. DOR transistor 2 is locked

and on its collector increases

negative potential, due to which the potential at the emitter of transistor 1 increases, which is also locked.

The maximum possible voltage at the emitter of transistor 1 is equal to 0 but twice the voltage of source b, which is greater than the selected conduction voltage of the threshold element 8. Thus, after charging the capacitor 3 and locking it

5 transistor 2 through the threshold

element 8 will flow the discharge current of the capacitor 3, i.e. on the load element 9, a pulse is formed ,, / corresponding in time to the trailing edge of the reference pulse for any

partial coincidence of the reference and analyzed pulses, which significantly expands the functionality of the pulse selector.

The duration of the output pulse and its power can be practically set by any due to the appropriate choice of types of transistors, a threshold element and capacitor capacitance ..-

BUT ////

FIG. 2

Claims (1)

TIME PULSE SELECTOR, made on the basis of a transistor element AND on two series-connected transistors of the same type of conductivity, characterized in that, in order to generate an output signal along the trailing edge of the reference pulse, regardless of the phase of the shift of the selected and reference pulses, a threshold element and a capacitor are introduced to it, while the capacitor is connected between the transistors and is connected by one of the leads to the emitter. rum of a transistor connected by a collector to a power bus, and with an input of a threshold element, and another output - with a collector of a transistor connected by an emitter to a common bus, and through a resistor with a power bus. ''