SU873420A1

SU873420A1 - Device for automatic fine adjustment of phase

Info

Publication number: SU873420A1
Application number: SU792865216A
Authority: SU
Inventors: Николай Семенович Жилин; Владимир Владиславович Грищаев; Леонид Степанович Субботин; Юрий Константинович Сидоров; Александр Иванович Воронков
Original assignee: Томский Институт Автоматизированных Систем Управления И Радиоэлектроники
Priority date: 1979-12-17
Filing date: 1979-12-17
Publication date: 1981-10-15

Description

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Изобретение относитс к радиотехнике и может использоватьс в системах с автоматическим регулированием.This invention relates to radio engineering and can be used in systems with automatic control.

Известно устройство автоподстройки фазы, содержащее последовательно соединенные фазовый модул тор, усилитель, первый смеситель, фазовый детектор и фильтр нижних частот, выход которого соединен с управл ющим входом фазового модул тора, второй смеситель, вход которого соединен с входом фазового модул тора , а также генератор, подключенный, к другим входам обоих смесителей 1.A phase self-adjusting device is known comprising a series-connected phase modulator, an amplifier, a first mixer, a phase detector and a low-pass filter, the output of which is connected to the control input of the phase modulator, a second mixer whose input is connected to the input of the phase modulator, and also a generator Connected to the other inputs of both mixers 1.

Однако известное устройство имеет амплитудно-фазовую погреишость.However, the known device has amplitude-phase error.

Цель изобретени - уменьшение амплитуднофазовой погрешности в широком диапазоне частот.The purpose of the invention is to reduce the amplitude-phase error in a wide frequency range.

Дл этого в устройстве автоподстройки фа- , зы, содержащем последовательно соединенные фазовый модул тор, усилитель, первый смеситель , фазовый детектор и фильтр нижних частот, выход которого соединен с управл ющим входом фазового модул тора, второй смеситель , вход которого соединен с входом фазового модул тора, а также генератор, подключенный к другимвходам обоих смесителей, м жду выходом второго смесител и другим входом фазового детектора включен усилитель-ограничитель , а между выходом первого смесител Н управл ющим входом генератора включень последовательно дополнительный фазовый детектор , к другому входу которого подключен опорный генератор, и дополнительный фильтр нижних частот.To do this, in a phase locked loop containing a phase-connected phase modulator, an amplifier, a first mixer, a phase detector and a low-pass filter, the output of which is connected to the control input of the phase modulator, a second mixer whose input is connected to the input of the phase module the torus, as well as the generator connected to the other inputs of both mixers, between the output of the second mixer and the other input of the phase detector, the amplifier-limiter is switched on, and between the output of the first mixer H and the control input A rator is connected in series with an additional phase detector, to another input of which a reference oscillator is connected, and an additional low-pass filter.

На чертеже приведена структурна электрическа схема предложенного устройства.The drawing shows a structural electrical circuit of the proposed device.

Устройство автоподстройки фазы содержит фазовый модул тор 1, усилитель 2, фильтр нижних частот (ФНЧ) 3, фазовый детектор 4, первый смеситель 5, усилитель-ограничитель 6, второй смеситель 7, опорный генератор 8, дополнительные фазовый детектор 9, и фильтр нижних частот (ФНЧ) 10, генератор 11.The phase locked loop contains phase modulator 1, amplifier 2, low pass filter (LPF) 3, phase detector 4, first mixer 5, amplifier limiter 6, second mixer 7, reference oscillator 8, additional phase detector 9, and low pass filter (LPF) 10, the generator 11.

Устройство работает следующим образом.The device works as follows.

Claims

The input signal U (out + Vo) is fed to the input of the phase modulator 1 and the second mixer 7. At the output of the phase modulator 1, the sigal changes its phase, takes the form if1 U, cos (ujt) and goes to the amplifier 2 with automatic gain control (AGC), which introduces its phase shift y and amplifies this signal to amplitude U. At the output of the amplifier 2 and the entire device have (+1) From the output of the amplifier 2, the signal goes to the input of the mixer 5 of the phase locked loop. The intermediate frequency signal from the output of the mixer 5 enters the phase detector 9. At the output of the phase detector 9, an error signal is generated, which passes through the low-pass filter 10, is fed to the controlled input of the generator 11, introducing corrective detuning. Thus, the phase-locked loop system for the secondary beats introduced into the device supports tju 10-LUpp In addition, the intermediate frequency signal from mixer 5 is fed to one of the inputs of phase detector 4. The signal from the output of generator 11 also goes to the second input of mixer 7 The output of which produces a signal of intermediate frequency, the amplitude of which is rigidly connected with the amplitude of the input signal through a mixer factor of 7 k. Thus, prom.sk5) The amplitude-phase error of the mixer 7 is within 0.1, so it can be neglected. The signal from the output of the mixer 7 is fed to the input of the amplifier-limiter 6, which serves for the dynamic range of the input signals, which ensures the normal conditions of operation of the phase detector 4 of the automatic phase adjustment system. Limiting amplifier 6 operates in a wide (-80 dB) amplitude range of input signals at a fixed frequency uugr. The amplitude of the phase error of such an amplifier does not exceed 0, by 80 dB. At the output of the amplifier-limiter 6 there is a driver that restores the waveform, thus the signal (uJ-tf) t + Vp is input to the input of the phase detector 4 from the output of the amplifier -gr; 111 of the reader 6, and the second input of this phase detector receives the signal from the output of the mixer 5, which has the form (u) t FM The output of the phase detector 4 generates an error signal proportional to the phase difference of the input signals 1 Phi V This signal, passing through the low-pass filter 3, is fed to the controlled input of the phase modulator 1, make corrective action basic shift. Thus, we have cot + 0, i.e., the phase difference between the input and output signals is O, i.e. it lies within the amplitude-phase errors of the mixer 5 and the amplifier-limiter 6. When implementing such a scheme in the frequency range 10-1000 The MHz amplitude-phase error is 0.3 + 0.4 when the amplitude changes by -40 dB (measurements were made with an FV-06 phase meter certified by the State Standard and having a measurement error UH not worse than 0.2). Claims of the invention A phase locked loop device comprising a serially connected modulator, amplifier, first mixer, phase detector and low pass filter whose output is connected to the control input of the phase modulator, a second mixer whose input is connected to the input of the phase modulator, and also a generator Connected to the other inputs of both mixers, characterized in that, in order to reduce the amplitude-phase error in a wide frequency range, between the output of the second mixer and the other input of the phase de incorporated projector of a limiting amplifier and between the output of the first mixer and the control input of the generator are connected in series a further phase detector, another input of which is connected to the reference oscillator, and an additional low pass filter. The sources of information taken into account in the examination of 1.3 EEE Jiternat Convent. Rec. 1966, V 11, N 3, s. 179--186 (prototype).