SU879788A1

SU879788A1 - Device for measuring amplitude-frequency characteristics of four-terminal networks

Info

Publication number: SU879788A1
Application number: SU782589697A
Authority: SU
Inventors: Олег Александрович Афанасьев; Владимир Николаевич Брюханов; Валентин Александрович Колбасов
Original assignee: Предприятие П/Я Г-4149
Priority date: 1978-03-10
Filing date: 1978-03-10
Publication date: 1981-11-07

Description

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Изобретение относитс к радиотехнике и может быть использовано Б радиоизмерительных устройствах различного назначени , в частности в измерител х амплитудно-частотных характеристик малошум щих СВЧ устройств.The invention relates to radio engineering and can be used in various types of radio measuring devices, in particular, in measuring the amplitude-frequency characteristics of low-noise microwave devices.

Извест-но устройство дл измерени амплитудно-частотных характеристик четырехполюсника, содержащее широкополосный генератор шума, свипфильтр , генератор синхроимпульсов, амплитудный детектор и индикатор| lA device for measuring the amplitude-frequency characteristics of a quadrupole, containing a broadband noise generator, a sweep filter, a clock generator, an amplitude detector and an indicator | l

Однако известное устройство имеет значительную погрешность при измерении амплитудно-частотных характеристик при малых уровн х измерительного сигнала, обусловленную вли нием собственных шумов исследуемого четырехполюсника iHowever, the known device has a significant error in measuring the amplitude-frequency characteristics at small levels of the measuring signal, due to the effect of the intrinsic noise of the quadrupole under study i

Целью изобретени вл етс повышение точности измерени .The aim of the invention is to improve the measurement accuracy.

Дл этого в известном устройстве дл измерени амплитудно-частотных характеристик четырехполюсника.For this purpose, in a known device for measuring the amplitude-frequency characteristics of a quadrupole.

содержащем широкополосный генератор шума, свип-фильтр, генератор синхроимпульсов, амплитудный детектор и индикатор, введен фильтр верхних частот, при этом выход широкополосного генератора шума подключен через последовательно соединенные свип-фильтр, четырехполюсник, амплитудный детектор и фильтр верхних частот к одному из входов индикато10 ра, другой вход которого соединен с другим выходом свип-фильтра через генератор синхроимпульсов.containing a broadband noise generator, a sweep filter, a clock generator, an amplitude detector and an indicator, a high-pass filter is inserted, and the output of the wide-band noise generator is connected via a series-connected sweep filter, quadrupole, amplitude detector and high-pass filter to one of the indicator inputs , the other input of which is connected to another output of the sweep-filter through the sync pulse generator.

На чертеже предоставлена схема The drawing provides a diagram

15 предложенного устройства.15 of the proposed device.

Устройство дл измерени амплитудно-частотных характеристик четырехполюсника содержит широкополосный генератор шума 1, свип-фильтр 2, A device for measuring the amplitude-frequency characteristics of a quadrupole contains a broadband noise generator 1, a sweep filter 2,

Claims

20 generator 3 sync pulses, amplitude detector 4, indicator 3, high pass filter 6 and quadrupole 7. The device operates as follows. From noise generator 1, a uniform agum signal arrives at a sweep filter 2, which extracts a narrowband noise signal from it, which is fed to the input of a quadrupole 7. a variable component corresponding to the power level of the narrowband noise signal at each point of the operating range, and for normal reproduction of the amp The frequency profile of the quadrupole sweep filter 2 must have a bandwidth 10-20 times the bandwidth of the quadrupole under study 7. The signal of the amplitude detector 4 is fed to the high-pass filter, made in the form of an RC filter, which separates the variable signal from the amplitude detector k indicator 5. The signals of the generator 3 of sync pulses are fed to the start input of the rotate of the indicator 5, on the screen of which the amplitude-frequency characteristic of the investigated etyrehpolyusnika 7. As the amplitude detector utilized l t bo detecting section when analyzed quadripole is a microwave amplifier or detector. 4 HF, when the quadrupole under study is a superheterodyne receiver. Thus, turning on the sweep filter 2 at the input of the quadrupole 7 and connecting to the output of the quadrupole amplitude detector 4 connected in series with the high-pass filter 6, eliminates the influence of the noise of the quadrupole on the measured characteristic, which improves the measurement accuracy and improves the electrodynamic characteristic of the device. Apparatus for measuring the amplitude-frequency characteristics of a quadrupole comprising a broadband noise generator, a sweep filter, a sync pulse generator, an amplitude detector and an indicator, characterized in that, in order to improve the accuracy of the measurement, a high-pass filter is introduced, with the output of the broadband generator noise is connected through a series-connected sweep filter, quadrupole, amplitude detector and high-pass filter to one of the indicator inputs, the other input of which is connected with other output sweeps through a filter clock generator. Sources of information taken into account in the examination 1. USSR author's certificate. No. 375587, Cl. 01 R 27/28, 1971 (Prototype A