SU515257A1 - Pulse generator - Google Patents

Description

(54) PULSE GENERATOR

one

The invention relates to a pulse technique and can be used as a master oscillator with high frequency stability.

Known self-oscillating blocking

generators, in which to stabilize the frequency of the generated pulses in series with the grid (base) transformer winding, turn on the delay line, short-circuited at the output, During the Hex Curia pulse of the blocking oscillator (the beginning of this pulse will be taken as the beginning of the countdown) (base) current a pulse is formed, which then propagates to the output of the line. At time T (TO - line delay), it is reflected from the short-circuited end of the line and, after a time 2T "

re-starts the blocking generator. Thus, the repetition period of the generated pulses T | rj 2T, and practically does not change under the influence of various destabilizing factors, in

including those that significantly change the so-called period of natural oscillations T, t. e. period at

the absence of a delay line in the circuit. This period, as a rule, is determined by the time of the driving elements (resistor and capacitor) in the grid circuit (base), and for the correct operation of the circuit, the condition T U 2T is required. .

A disadvantage of the known schemes is the frequency instability of the generated pulses, due to changes in the natural oscillation period T ,, and the final

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the rise time of the leading edge returned to the input line of the trigger pulse 1J,. The period of natural oscillations may vary by magnitude.

Claims (3)

for example, when the temperature changes or as a result of aging, the time of the setting elements. This causes the greater the change in the moment of repeated operation of the dT blocking generator, the greater the steepness of the leading front,. The slope decreases with increasing delay time (in our case, it is 2T "), because, firstly, increases the duration of the front t p y2T, and, secondly, due to losses in the line decrease IJZ. in accordance with the curve, the amplitude with the expression W1H of the transmission coefficient of the K V line ("tC is the attenuation coefficient). The closest known device is a pulse generator comprising a transistor blocking generator, in which one of the delay line terminals is connected to the connection point of a resistor with a feedback coil of a pulse transformer via a capacitor. The disadvantage of such a generator is also insufficient stability of the repetition frequency of pulses. The aim of the invention is to increase the stability of the pulse repetition rate. This is achieved by introducing an additional transistor waiting for a single generator into the pulse generator, the second terminal of the delay line is connected directly to the connection point of the resistor with the output winding terminal of the first connection I1 of the H transformer. Fit 1 shows the electrical circuit diagram of the generator; on; bir. 2 - timing diagrams for the operation of a pulse generator. The generator consists of a self-oscillating blocking generator on transistor 1 with a collector winding of transformer 3 shunted by a diode 2. The secondary winding of transformer 3 is connected to the base of transistor 1 through the capacitor 4 and to the input of the delay line 5, to the ground by the resistor 6, Resistor 7 connects the base of transistor .1 to the power line. The output of the line through the capacitor 8 is loaded on the D.sub.tor H, connected in series with the base; winding traxfor-lat. 10: waiting for a blocking generator on the transistor llj reverse (with respect to transistor 1) conductivity. The collector winding of a transformer ator 10 is shunted by a diode 12. The emitter of a transistor 11 with the power supply is connected via a wrist 13, intiated by the capacitor Il, and is connected; bus generator - through a resistor 15. Works r-eiiop vrop n: 1oduk) Dbp; r o In voMeriT forlpf013; np; 5; ; iynbca: 1lo king-generator and tr; L;: St;:. To j. as a result of the current; 3s: / aH :: the current on the resistor 6 and a positive voltage pulse appears at the input of the line (see fig. 2.6). After time T it reaches the output of the line and through the capacitor 8 and the winding of the transformer 10 enters the base of the transistor 11 waiting for the blocking generator. The inhibited mode of this generator is ensured by the fact that the emitter of transistor 11, due to the voltage divider formed by resistors 13 and 15, has a higher potential than the base connected through the winding of the transformer 10 and resistor 9 to the power bus. When a positive polarity pulse is output from line 5, this blocking generator triggers and the resulting base current of transistor 11 generates a negative pulse at resistor 9 and at the line output, which then travels to the input. At the moment of time 2T it enters the o.J n1 base of the transistor 1 l causes the repeated repetition of the auto-oscillation nozzle of the ng generator. Diodes 2 and 12 are equipped with 1Ya7 spinning emissions) at collectors of transistors at the same time; you’re ending} g1sov blocks of ng-hentertatov. You have to do this for 2T ", it is supplied: ro; i6oDjN type 3 resistance of the resistor 7. To match the line of the deadline, input: on the course during the resistance of resistors 6 and 9 .n: equal to waveguide CO; TI; About Ivonia lines. The blocking transistor ::; - .11 ;; Apr is the same, defined by cooTHj:: Oir; iei: :: the resistances of resistors 13 and 15. It is not necessary to be too large to not overload; -; z zaizsk waiting; his blocking KING-geierago ;::;; ; .-; fv: ji, i..r-, a: go from B111 to the line. Thanks to T: G ;: -,: u pp1e ;; yu, in contrast to known1; t; x, where in Eloit Tn and iIlylyc: npoci.j is limited from short-circuited B1., The delay line in this circuit in the wrzmtr of the times T la the output of the scientific research institute for the delay of the axis: the front and amp regeneration is: (chup, chmulchs;: ;;;; ska; with C) abaturation / kuideg :: Ol:, k1:; pa output fzrchlruots pulse with tahil; same llopltl ;, l, i duration of the front i,.;% -). |.: ;;: to the impulse ;: with 1 formed in the moment: P tsretchea t 0 at the input of the line. In this way, the displacement is completely compensated (the front and a decrease in the number of pulses. Those that occurred in the time interval O..T, —J. In a 1NE generator and the reduction of the incidence of the starting pulse iJ occurs only when the signal is received; i.e. H5; iG: -value 1, - 2T, and therefore it is less than in the well-known scheme where the claim / k pulse form pulse is accumulated over twice the interval of 0-2T ". Minimum gain in improving frequency stability is obtained at the transmission coefficient (this corresponds to the lines with shim T "), since in this case the gain is due only to the shortening of the front reflected from the output of the pulse line. With increasing T, which corresponds to a decrease in K, the gain increases several times, since now the regeneration affects not only the pulse but also the amplitude. Claims An impulse generator comprising a transistor blocking generator in which one of the terminals of the delay line is connected to the connection point of the resistor with the output winding of the pulse transformer through a capacitor u with the fact that, in order to increase the stability of the repetition frequency of 1 megapixel, an additional transistor block-hg generator is not spoken to the point of which the resistor-ora is connected to the point: the winding water of the pulsed transformer of the second transformer is directly connected ; water zptserzhki. Sources 11Nforh) taken into account during the examination: 1.Ya. Millman, G, Taub. Pulse and digital devices, Gosenergoizdat M., 1960 2.A. J. Khesin, Mmpulsna technique, Energie, M., 1965 3. Handbook of P & L technique, ed. V.N. Yakovleva, Sv z, Kiev, 1970