SU815861A1

SU815861A1 - Phase detector

Info

Publication number: SU815861A1
Application number: SU792763290A
Authority: SU
Inventors: Игорь Владимирович Фридлянд; Валерий Геннадиевич Сошников
Original assignee: Всесоюзный Научно-Исследовательскийинститут Телевидения И Радиовещания
Priority date: 1979-05-03
Filing date: 1979-05-03
Publication date: 1981-03-23

Description

(54) ФАЗОВЫЙ ДЕТЕКТОР(54) PHASE DETECTOR

II

Изобретение относитс к радиотехнике и может быть использовано дл демодул ции фазомодулированных сигналов4The invention relates to radio engineering and can be used to demodulate phase-modulated signals.

Известен фазовый детектор, содер жащий последовательно соединенные источник опорного сигнала, триггер, другой вход которого вл етс входом устройства и фильтр, выход которого вл етс выходом устройства ИОднако известное устройство имеет низкую точности измерени фазовых углов..A phase detector is known which contains a reference signal source connected in series, a trigger, another input of which is an input of the device and a filter whose output is an output of the device. However, the known device has a low accuracy of phase angle measurement.

Цель изобретени - повышение точности измерени фазовых углов.The purpose of the invention is to improve the accuracy of measuring phase angles.

Цель достигаетс тем, что в фазовый детектор, содержгшшй последовательно соединенные источник опорного сигнала, триггер, другой вход которого вл етс входом устройства и фильтр, выход которого вл етс выг. дом устройства, введены между выходом триггера и входом фильтра первый усилитель, и последовательно соединенные формирователь импульсов, вход которого подключен к выходу источника опорного сигнала, второй усилитель, дополнительный фильтр и компаратор, другой вход которого вл етс входом опорного напр жени The goal is achieved by the fact that a phase detector containing a series-connected reference source, a trigger, another input of which is an input of the device and a filter whose output is dig. A device is inserted between the trigger output and the filter input of the first amplifier, and a pulse generator connected in series, the input of which is connected to the output of the reference signal source, the second amplifier, an additional filter and comparator, the other input of which is the reference voltage input

а выход соединен с шинами питани усилителей.and the output is connected to the amplifier power buses.

На чертеже приведена структуригш схема предлагаемого устройства.The drawing shows the structure of the proposed device.

Фазовый детектор содержит источник 1 оперного сигнала, триггер 2, первый усилитель 3, фильтр 4, формирова-тель 5 импульсов, второй убилитель 6, дополнительный фильтр 7, The phase detector contains the source 1 of the operand signal, trigger 2, first amplifier 3, filter 4, pulse generator 5, second killer 6, additional filter 7,

6 компаратсч 8, источник 9 опорного напр жени .6 Comparative 8, reference voltage source 9.

Фазовый детектор работает следующим образом.Phase detector works as follows.

На раздельные входы триггера 2On separate inputs of the trigger 2

Claims

5, the measured frequency and the source 1 frequency of the reference signal are received. If there is no frequency detuning of the source 1 of the reference signal (pulses formed by a FORMER 5 pulse and amplified at the 1-cell 6, they have a constant voltage separated by an additional filter 7 equal to the reference voltage applied to the input of the comparator 8 In this case, the difference between the input signals of the comparator AO is zero, and its output contains the initial voltage required for the pushing of amplifiers 3 and 6 - y. When changing, for example, decreasing the frequency of the reference signal (TST, pulse ratio, An additional filter 7 is reduced, the constant component of this signal is proportional to the reference voltage, and a voltage appears at the input of the comparator 8. The latter is amplified by the comparator 8 and increases the supply voltage of amplifiers 3 and 6, decreasing it to 0. At the input of filter 4, proportional amplification of the amplitude of the trigger pulses - UY t also occurs as a result of the ratio Ur / T, where T is the frequency period of the source 1 of the reference signal, does not change its initial value, due to the use of In the rigid feedback system (elements 5–8), the accuracy of the detector parameters is maintained even when the frequency of the source 1 of the reference signal 1 is changed, due to the effect of temperature and supply voltage surges. Frequencies Formula of the Invention A phase detector containing successively connected reference signal source, a trigger, another input of which is an input of a device and a filter whose output is an output of a device, characterized in that, in order to improve the accuracy of measuring phase angles, the trigger and the input of the filter are the first amplifier, and the pulse generator connected in series, the input of which is connected to the output of the reference signal source, the second amplifier, the additional filter and the comparator, the other input of which is the reference voltage input and the output is connected to the busbars of the amplifiers. Sources of Information taken into account in the examination 1. A. Goncharov. and others. Technique magnetic video. M., ener1;: and 1970, p.112 (prototype). VihoV