SU393804A1 - PULSE FORMER - Google Patents

Description

The invention relates to a pulse technique and can be used as a generator of frequency frequencies.

A well-known imager shaper containing a multivibrator on two transistors of a pnp type, in which the time setting capacitors are connected between collectors of the tract and common points: m: and time-varying resistors does not allow for the low frequency of the generated pulses.

The purpose of the invention is to reduce the lower limit of the frequency of the generated pulses.

To do this, it was additionally introduced (a SOURCE of a pulsed commutator on the “rim” and a grinder made on transistors of the opposite conductivity type, with an additional source of dial pulses connected between the emitters of the multivibrator's tracer emitters and the common point of the circuit, and each of the inputs of A trigger made on transistors of opposite type of conductivity is connected to the anodes of ioluttrovodnykh diodes.

FIG. 1 A trinzial electric circuit diagram of the proposed pulse generator is presented; in fig. 2 a, b, c, d, d, e,

g - voltage diagram at various points of the circuit.

The pulse shaper contains a multivibrator with two transistors / and a ppp of conduction type, in the collector circuits of which resistors 3 and 4 are included, and in the basic circuits - the time setting resistors 5 and 6, semiconductor diodes 7 and S with reverse current and limiting The terminal resistors 9 and 10. Between the collectors of transistors / and 2 and the cathodes of diodes 7 and 5, the time specifying capacitors // and 12 are included. Between the emitters of transistors / and 2 and the common point of the circuit, the source 13 of the impulse switching voltage, and the anodes of the diodes 7 and 8 pre-wired to the corresponding inputs of the trigger 14. The trigger 14 is made according to the scheme with direct collector-baseline connected to two transistors 15 and 16 of the opposite conductivity type, in the collector depy of which resistors 17 and 18 are included, and the base circuits are resistors 19 and 20 . The power of the multi driver is supplied from the source that is connected to terminal 21, and the trigger is powered from source a, connected to terminal 22.

The pulse shaper operates as follows. Let at time t - Q the circuit switched to the state in which the transistor / is open and the transistor 2 is closed.

This state of the transistors: / and 2 is the switching circuit of the o1boopech. By the fact that three of this trigger 14 is turned off into the state trikotorotra zistor 15 is open, and the transistor 16 is closed (Fig. 2e, g). The positive value of the pulsed-switching voltage at the emitter of transistor 1 (point 23) creates in the circuit of the base of the transistor /, the current required to saturate this transistor. The closed state of the transistor 2 is provided by supplying its base of positive voltage from the collector of the closed transistor 16 of the trigger 14. 6 The moment the transistor Y unlocks the voltage aa of its collector pumping decreases almost to zero (Fig. 26), and the voltage at point 23 (Fig. 2d) Abruptly increases to the magnitude of the voltage of the source and itch. As a result, the diode 7 is locked, and the time of the setting resistor 5 is disconnected from the input of the trigger 14. The process of discharge of the capacitor 11 and the charge of the code capacitor 12 begins (Fig. 2d, e). In the time interval equal to TI (Fig 2b), the diode 7 is closed, and the pulsed switching voltage does not affect trigger 14. At the moments at which “apr at point 23 (fig 2a) for a time k equals approximately zero, the incidence, the gratted state of the transistor / is ensured by the fulfillment of the 4th time condition (dissociation of the transistor carrier).

As the capacitor 11 is discharged, the positive "april at point 23 gradually decreases and the moment sets in when the diode 7 is shifted in the right direction. Under the action of a switching voltage impulse, a current flows through diode 7, the value of which is determined by the value of the resistor 5 and the value of the switching voltage. If the resistor 5 is large (several tens of mega), then

current,. flowing through the resistor will be very slight. Therefore, the magnitude of the current flowing through the opening diode, 7, will be detected and the pulse-switching commutator. by the voltage of the source 13. If this current reaches a value sufficient for the sa-pyrani of the transistor 15 of the flip-flop 14, then the flip-flop of the 14 will switch, and then the whole circuit will switch to a new state. In the new state B the passage of time TZ occurs the discharge of the capacitor 12 and the charge of the capacitor 11 to the value of the voltage of the power source -EI. The switching of the trigger 14 and the entire circuit to the initial state occurs in the same way as described.

Subject and z about-b ete n i

A pulse shaper containing a multivibrator on two transistors, which is the time where the driving capacitors are connected between the collectors of the transistors and the common points of the driving resistors and semiconductor diodes connected in the conducting direction (in series with the bases of the transistors, different By the fact that, in order to reduce the lower frequency limit of the frequency of the generated pulses, a source of pulsed switching voltage and three have been added to it (pger, made on opposite transistors type (conductivity, and m. additional source of switching impulse s1p1 impulses is included: between the common point of the emitters of the transistors of the multivibrator and the common point of the circuit, and each of the inputs of the additionally introduced three lgers performed on transistors of opposite type of conductivity connected to the anodes of semiconductor diodes.

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