SU437205A1 - Pulse shaper - Google Patents

Description

one

The invention relates to the field of pulsed technology and can be used to form trapezoidal, sawtooth and triangular pulses.

A pulse shaper is known that contains two dc generators, a charge switching element with three outputs, one of which is connected to the opposite-polarity electrodes of two limiting diodes and one of the plates is the time of the driver air conditioner.

The purpose of the invention is to stabilize the amplitude of the output pulses.

This is achieved by the fact that the diode driver includes an additional two diodes and two three-stage inverters, the inputs of which are connected to the outputs of the dc generators directly, and to the two outputs of the charge switching element through additional diodes, while the second divergent terminals are connected to the outputs of the three-stage inverters electrodes of restrictive diodes.

FIG. 1 shows the scheme of the proposed generator; in fig. 2 - diagrams for example, which explain the principle of operation of the proposed former.

The shaper contains adjustable generators of direct current of charge 1, bit 2, switching device 3, connecting

diodes 4 and 5, input emitter followers 6 and 7, resistors 8-15, inverters 16 and 17, terminal emitter repeaters 18 and 19, limiting diodes 20 and 21, and the time setting capacitor 22.

In the static state, the capacitor 22 is charged to the level of the limiter limiter 20 by the DC generator of charge I (see Fig. 2).

 f / 3,. + f /,

and,

Ogr 20

When a triggering pulse is applied to the switching device 3, the DC generator 1 is turned off and the capacitor 22 begins to discharge by the DC generator of discharge 2 to the limiter 21 limit level.

orp ai - -in 1c I

The formation of the leading edge of the pulse. At the end of the pulse on the switching device 3, the DC generator of the discharge 2 turns off and the capacitor 22 starts charging to the level of the limiter 20

 and,., + and.

and.

Ogr 20

The formation of the trailing edge of the pulse. The circuit returns to its original state.

When adjusting the fronts, i.e., when the charge currents change from / charge min to / charge max (regulation of the falling front) and discharge from / fold min TO / times max (control of the leading edge), one flows through diodes 4 and 20 the same charge current, and through diodes 5 and 21 the same discharge current. Consequently, the law of the change in voltage drop across diodes 4 and 20, as well as at 5 and 21, will be the same. Since the input emitter repeaters 6 and 7, the inverters 16 and 17, the terminal emitter repeaters 18 and 19 operate in a linear mode and have voltage gain, the potentials of the emitters of the transistors 18 also change as the voltage drop changes. and 19 in such a way that the levels of restriction

iJorp.20 Ugis + fJ20 and i / orp.21 i / 3l9 + 21 STAY

and, consequently, the amplitude of the output pulses when adjusting the fronts remains constant. We prove it mathematically. Levels of limitation

i / orp .., i. + ",

OGR 11 - It r; V “l

If, for simplicity, we neglect small voltage drops at the base-to-emitter transitions of 6, 16, 18, 7, 17, and 19, then:

g / - b "o

t-e It -

Rit

, -t / 67

R.

and ... R

to

Since the inverters are 16 and 17

  KIU 3,

THAT

81 .. / ,, ...

e. t /; + t / ,,

,,

where t / K and UK are the voltage on the switching device, then

t / .I.- l- K-i / 4.

5 and „.Е, -и: -и ,.

Then

OGR I. - l - - 4 + ,,

orp ..-.- i / K-t /, + t /.,. Since U С / „, :: i / .i,

// r- P // i :. // P //

-orpao, t K

Thus, the levels of limiting from the voltage drop across the limiting diodes 20, 21 do not depend.

During the experimental verification of the proposed former, the amplitude of the pulses changes less than 1% when the charge and discharge currents change, the time of the driving capacitor varies from 1 ma to 20 ma.

Subject invention

A pulse shaper containing two dc generators, a charge switching element with three outputs, one of which is connected to two-pole electrodes of two limiting diodes and one of

plates, the time of the driving capacitor, characterized in that, in order to stabilize the amplitude of the output pulses, an additional two diodes and two three-stage inverters are included in the pulse shaper, the inputs of which are connected to the outputs of the DC generators directly, and with the two outputs of the switching element, charge - through additional diodes, at the same time to the outputs of three-stage inverters

connected the second dissimilar electrodes of the restrictive diodes.

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