SU1596472A1 - Pulse shaper - Google Patents

Abstract

The invention relates to a pulse technique and can be used, for example, in radar devices. The purpose of the invention is to improve the shape of triangular pulses. To achieve the goal, a device containing a voltage source 1, a charging resistor 2, a key 3, a load resistor 4 and an open segment 7 of a uniform line are inserted, a hyperbolic line segment 5 and an inductance 6 are introduced. are charged from source 1. After the key 3 is closed, as a result of transients, a symmetrical triangular pulse with high linearity is formed on the resistor 4. 2 Il.

Description

SP

with about

four

to

FIG. g

The invention relates to a pulsed technician and can be used, for example, in radar devices.

The purpose of the invention is to improve the shape of triangular pulses,

FIG. 1 shows the structural scheme of the proposed shaper; Fig 2 - time diagrams of his work.

The device contains a voltage source 1, a charging resistor 2 and a switch 3, a load resistor 4 (segment 5 of the hyperbolic line, inductance 6 and an open segment 7 of a homogeneous line. The first input terminal of the segment 5 is connected via the inductance 6 to the first key of the switch 3, and the second input terminal of the segment 5 is connected to the second output of the key 3, the first terminal of the resistor 4 is connected to the first input terminal of the open section. 7, the second input terminal of which is connected to the first output terminal of the segment 5, second output and the terminal of which is connected to the second output of the resistor 4.

In this case, the relations are satisfied.

t t bL

(1) 3, З.г 4.

t j, t j are the delay times in the uniform and hyperbolic lines, respectively;

t „- the duration of the generated pulse.

And, |,

(2)

W,

where W is the resistance of the parallel connection of the inductance and the hyperbolic line; W, is the wave impedance of a uniform line;

R is the resistance of the resistor 4.

The shaper works as follows.

In the initial state, the source 1 charges the forming circuits through the charging resistor 2. When the key 3 is closed, the discharge occurs through the key 3 and the resistor 4.

Conductivity between the output terminals of the segment 5 with the key closed 3 is equal to

(3)

 R

5 The voltage at the output terminals of the segment 5 is determined by the operator expression

one

one

(four)

Y

Substituting (3) into what, as follows from

Rut

"Ri: P

L

eight

we get 20 and (p)

(five)

The original of the resulting operational image function

U (t) 1 (t) - (t -) 1x Ltw by (t - tjl (t-tj - ...

Kt-f).

where 1 (t) is a single step

function

This voltage acts at the input of an open segment 7 with time.

delays t j t, -. Consequence of this

the fact that the triangular pulse UH (t), which is allocated on the resistor 4, is an algebraic sum. ma functions acting from some fixed for each function

time 5

U "(t) U (t) - l (t) - l (t - 1n). (7)

Thus, a triangular pulse is obtained on the load, which is a superposition of two signals with the same amplitude but of different polarity, with the second signal being delayed. relative to the first at time tH (Fig. 2)

-ll

l (t) - (t –b),

llJt)

; "L (t - i) + i (t - tH) l (t - t) 1. (8)

t - t U-

Thus, in the proposed device as compared with the known, triangular pulses with high linearity and a symmetrical shape are obtained. The formation of triangular pulses by means of segments of homogeneous and hyperbolic lines provides a high coefficient of the useful effect of the device.

Claims (1)

Invention Formula A pulse shaper containing series-connected voltage source, charging resistor and switch, the second pin of which is connected to the second pin of the voltage source, as well as a load resistor, the first pin of which is connected to the first input terminal of the open section of a uniform line, characterized by that, in order to improve the shape of the triangular impulses, an inductance and a hyperbolic segment are introduced into it: the first input terminal of which is connected to the first terminal through the inductance key, and the second input terminal - with the second output of the key, the first output terminal is connected to the second input terminal of the open section of a homogeneous line, and the second output terminal is connected to the second. at the load resistor, the condition W,. where W is the resistance of parallel-connected inductances and a segment of the hyperbolic line; Wj is the characteristic impedance of a segment of a uniform line; R is the resistance of the load resistor.