SU1282311A1 - Variable phase shifter - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to reduce the amplitude distortion of the output signal. The device comprises an amplifier-limiter 1, a divider 2 frequencies, an integrator 3, two comparators 4 and 5, a source 6 of the reference voltage, two blocks 7 and 8 of differentiation, a single vibrator 9, a first harmonic filter 16. An impedance 10, a low-pass filter 11, two keys 12 and 14, an inverting amplifier 13, an inverter 15, an OR 17 element are introduced. 2 Il.

Description

1C

00 N9

00

FIG. one

The invention relates to radio engineering and can be used to smoothly adjust the phase of a signal from 0 to 360 without changing its amplitude.

The purpose of the invention is to reduce the amplitude distortion of the output signal.

FIG. 1 shows an electrical structured circuit of a controlled phase shifter; FIGS. 2 are timing diagrams explaining the operation of the controlled phase shifter,

The controlled phaseF battery (FIG. 1) contains amplifier limiter 1, frequency divider 2, integrator 3, first comparator 4, second comparator 5, reference voltage source 6, first differential block 7

15

first and second differentiation blocks 7 and 8, respectively, by which the output pulses are differentiated (Fig.,}, the leading edges of the output pulses of the first and second comparators 4 and the one-shot 9 are started through the OR 17 element, and the square pulses are generated at the output (Fig 2i), the duration of which is equal to the half period of the input sine signal. The input sinusoidal voltage (Fig. 2, c) also enters the input of the rectifier 10, where it is rectified, and then filtered with a filter 11 of the lower frequencies.

The positive voltage from the low-pass filter 11 enters the signal input of the first key 1

No, the second differentiation unit 8, 20 d, also through the inverting amplifier-modulator 9, the transmitter 10, the low-pass filter 11, the first switch 12, the inverting amplifier 13, the second switch 14, the inverter 15, the first harmonic filter 16, the element OR 17.

Managed phase shifter works as follows.

The input harmonic signal (Fig. 2, a), equal to U (t) U sinuJ t,

25

The driver 13 with the transmission coefficient equal to –1, the negative polarity voltage is fed to the signal input of the second key 14 (FIG. 2, k).

The control input of the first key 12 and through the inverter 15 to the control input of the second key 14 receive pulses from the output of the one-vibrator 9. Trans. , „, Out and the second keys 12 and 14 open- where and, is the amplitude of the signal, fasting alternately, forms a rectangular impulse and connects the controlled-phase voltage to the input of the controlled phase-shifted output equal to the reader 1 in rectangular pulses of the same frequency (FIG. 2.8). The frequency of these pulses is divided into two by a divider 2 frequencies (Fig. 2.6), the output pulses of which are converted into triangular pulses by the integrator 3 (Fig. 2, d). These im40

By varying the voltage of the source.6, it is possible to change the value of H within O - 360 °, while the amplitude of the output signal will be proportional to the amplitude of the input signal (Fig. 2, L) equal to U (t) KU, sin (m) where K is the transmission coefficient of the controlled phase shifter.

input signal, but shifted in phase relative to the input signal 35 (Fig. 2, k). These pulses, the passage through the filter 16 of the first harmony, are pre-. spread to a sinusoidal voltage offset from the input signal by an angle H.

pulses come to the first inputs. the first and second comparators 4 and 5; the source voltage of the source 6 is supplied to their second inputs; the second input of the first comparator 4 receives a positive polarity voltage, and the second input of the second company 45

Ratio 5 - voltage (-U,) of negative polarity of the same size (Fig. 2.7,). When comparing the triangular voltage coming from the output 50 of the integrator 3, and the reference voltage coming from the outputs of the source 6 of the reference voltage, at the outputs of the first and second comparators 4 and 5, square-shaped pulses 55 appear (Figs. 2a, e).

The outputs of the first and second comparators 4 and 5 are connected to the inputs. Thus, the amplitude of the output signal of the controlled phase shifter is proportional to the amplitude of the input signal regardless of the magnitude of the phase change.

F. formula of invention

Controlled phase shifter containing a series-connected amplifier-limiter, divider

first and second differentiation blocks 7 and 8, respectively, by which the output pulses are differentiated (fig.,}, the leading edges of the output pulses of the first and second comparators 4 and 5 through the OR 17 element start the one-shot 9, at the output of which rectangular pulses are formed (fig 2i) whose duration is equal to half the period of the input sinusoidal signal The input sinusoidal voltage (Fig. 2, c) also enters the input of the rectifier 10, where it is rectified, and then filtered by the low-pass filter 11.

A positive voltage from the low-pass filter 11 enters the signal input of the first key 12,

d also through inverting force

The driver 13 with the transmission coefficient equal to –1, the negative polarity voltage is fed to the signal input of the second key 14 (FIG. 2, k).

The control input of the first key 12 and through the inverter 15 to the control input of the second key 14 receive pulses from the output of the one-vibrator 9. The first. and the second keys 12 and 14 open, alternately, forming at the combined output a rectangular pulse voltage with a frequency equal to

input signal, but shifted in phase relative to the input signal (Fig. 2, k). These pulses, passing through the first harmony filter 16, are converted into a sinusoidal voltage offset from the input signal by an angle H.

Thus, the amplitude of the output signal of the controlled phase shifter is proportional to the amplitude of the input signal, regardless of the magnitude of the phase change.

F. formula of invention

Controlled phase shifter containing a series-connected amplifier-limiter, divider

312

frequencies, the integrator, the first comparator and the first differentiation unit, the second comparator connected in series, whose input is combined with the input of the first comparator, and the second differentiation unit, the reference voltage source, the outputs of which are connected to the reference inputs of the first and second comparators, as well as - a new vibrator and a first harmonic filter, characterized in that, in order to reduce the distortion of the output signal amplitude, a serially connected receiver, whose input is combined, is introduced into it

/ / l. / x / x

and

V / ХХ - / ЧХ XX

Tiit-P-gitllPLLL-G

and

QJTJTJlJTJliPL

iL-f.

,, V u vx

14 .

with the limiter amplifier input, low pass filter, inverting amplifier, the first key whose output is connected to the first harmonic filter input, and the second key connected between the low pass filter output and the first harmonic filter input, while the outputs of the first and second blocks Differentiations are connected through the input element OR to the input of the single vibrator, the output of which is connected to the control input of the first key via the input inverter, and to the control input of the second key directly.

.:one.

TJliPL

iL-f.

,, V - At vx

.

Claims (2)

Controllable phase shifter containing serially connected amplifier-limiter, divider 3 12823 frequencies, an integrator, a first comparator and a first differentiation unit, connected in series to a second comparator, the input of which is combined with the input of the first comparator, and a second differentiation unit, a reference voltage source, the outputs of which are connected to the reference inputs of the first and second comparators, as well as a one-shot and filter of the first harmonic, characterized in that, in order to reduce distortion of the amplitude of the output signal, a rectifier connected in series is introduced, the input of which is combined 15 with the input limiter amplifier, low-pass filter, inverting amplifier, the first key, the output of which is connected to the input of the first harmonic filter, as well as the second key connected between the output of the low-pass filter and the input of the first harmonic filter, while the outputs of the first and second differentiation units are connected through the input OR element to the input of a one-shot, the output of which is connected to the control input of the first key through the input inverter, and to the control input; second key directly. and § 4 g — I 1--1 G — 1 czl I U m I — ί; m..t and - uA, · ,, A—— A, ..- Ajj ··· ......— .A. ! " - --Up — k-TU, —L <Pui.Z