SU678630A1

SU678630A1 - Frequency automatic tuning device

Info

Publication number: SU678630A1
Application number: SU772451626A
Authority: SU
Inventors: Станислав Арташесович Даниэлян; Александр Александрович Мацков; Юрий Моисеевич Супер; Юрий Сергеевич Щедров
Original assignee: Предприятие П/Я А-7956
Priority date: 1977-02-10
Filing date: 1977-02-10
Publication date: 1979-08-05

Description

Изобретение огносигс к радиотехнике И может быть использовано в демодул торах и в след щих фильтрах. .The invention of ogneigs to radio engineering and can be used in demodulators and in following filters. .

Известно устройство дл автоподстрой- ки частоты, содержащее соединенные в кольцо триггерный фазовый детектор, усалитель посто нного тока, фильтр нижних частот и управл емый генератор, при этом входной сигнал подан на другой вход триггерного фазового детектора 11.A device for auto-tuning a frequency is known, comprising a trigger phase detector connected in a ring, a DC amplifier, a low-pass filter and a controlled oscillator, and the input signal is fed to another input of the trigger phase detector 11.

Однако известное устройство обладает узкой полосой захвата.However, the known device has a narrow capture band.

Цель изобретени - расширение полосы захвата.The purpose of the invention is the expansion of the capture band.

Дл этого в устройстве дл автоподстройкв .частоты, содержащее соединенные в кольцо трвггерный зовый детектор, усвлитель посто нного тока, фильтр нвжннх частот и управл емый генератор, при этом входной сигнал подан на другой вход триггерного фазового детектора, усилитель посто нного тока выполнен регулируемым 1Ю коэффшхиенту усилени , а между выходом трнггврного фазового детектора в вхоFor this purpose, in the device for auto-tuning of frequencies, there are ring-connected three-phase pass detector, direct current control, frequency filter and controlled oscillator, while the input signal is fed to another input of the trigger phase detector, a direct-current amplifier is made adjustable to 1H power factor amplification, and between the output trnggvrnogo phase detector in the input

дом управлени коэффициентом усилени усилител посто нного тока включены последовательно соединенные дифференцирующа цепь, двуполупериодный выпр митель и расширитель импульсов.The house of the gain control of the DC amplifier is connected in series with a differentiating circuit, a full-wave rectifier, and a pulse expander.

На фиг. 1 изображена структурна электрическа схема предложенного устройства . Временные диаграммы, по сн ю-, шие его работу, представлены на фиг. 2 .и 3.FIG. Figure 1 shows the structural electrical circuit of the proposed device. The timing diagrams for his work are shown in FIG. 2 .and 3.

Устройство содержит триггерный фазовый детектор 1, усилитель 2 посто нного тока, фильтр 3 нижних частот управл емый генератор 4, дифференцирующую цепь 5, двухполупериодный выпр митель 6 в расширитель 7 импульсхэв.The device contains a trigger phase detector 1, a direct current amplifier 2, a low-pass filter 3, a controlled oscillator 4, a differentiating circuit 5, a full-wave rectifier 6 into the expander 7 pulsesv.

Устройство работает следующим образом .The device works as follows.

Claims

The error signal from the output of the trigger phase detector detector 1, to which the input signal and the signal of the controlled oscillator 4 are fed, is fed through the amplifier 2 into the filter 3 to the control input of the controlled oscillator 4, adjusting its frequency. If there is a triggering of the trigger of the phase detector 1 after the amplified filtrating, a symmetric sawtooth (Fig. 2a and Za) linearly rising or linearly falling string appears, which contains a small constant component necessary for the rearrangement the frequency of the controlled oscillator 4 to the frequency of the input signal, due to the action of the usual pickup mechanism in the PLL loops. However, due to the additionally connected between the output of the trigger 1X phage detector 1 and the control input of the amplifier 2, the serially connected differentiating circuit 5, the bipolar period rectifier 6 and the expander 7, appears as a rapid transition of the saw From spit to minus and vice versa, at the output of the differentiating circuit 5, pulses appear (Figs. 26 and 36), which are rectified by a two-period optical output (Fig. 2c and Sv), reach the expander 1, extend over a period of and (FIG. 2d and Sr) and supplied to the amplifier control

2. As a result, at the output of amplifier 2, instead of a symmetrical sawtooth, an asymmetric sawtooth voltage appears (Fig. 2d and AH), which already has a constant component corresponding to the frequency tuning frequency between the input frequency the signal and signal of the controlled generator 4, allocated at the output of the filter 3, and then coming to the control input of the controlled oscillator 4, the frequency of the latter to the capture frequency and further synchronization. A device for automatic frequency control allows you to increase the capture bandwidth while maintaining noise immunity. Claims An auto-tuning device comprising a co2 grizzly phase detector, a dc amplifier, a low-pass filter and a controlled oscillator, the input signal being fed to another trigger phase detector, characterized in that the expansion of the pickup band, the DC amplifier is made adjustable in gain, and between the output1 of the trigger: a phase detector and the control input: serially connected differentiating circuit, half-wave rectifier and pulse expander. Sources of information taken into account during the examination 1. Zhilin N. S. Phase-meter converters with trigger phase sensitivity M element in the FAL system, intermediate often. - Phase measuring systems and devices. Tomsk University, 1974.

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