SU799102A1

SU799102A1 - Spectrum generator

Info

Publication number: SU799102A1
Application number: SU792752267A
Authority: SU
Inventors: Евгений Степанович Бугаец
Original assignee: Предприятие П/Я Р-6856
Priority date: 1979-04-13
Filing date: 1979-04-13
Publication date: 1981-01-23

Description

(54) ГЕНЕРАТОР СПЕКТРА(54) SPECTRUM GENERATOR

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Изобретение относитс к импульсно и радиоизмерительной технике и может использоватьс при измерении полосы пропускани и частотных характеристик радиотехнических устройств.The invention relates to a pulse and radio metering technique and can be used in measuring the bandwidth and frequency characteristics of radio devices.

Известен генератор спектра, содержащий задающий генератор, к выходу которого подключены три параллельных канала, первый из которых состоит из фазовращател , а второй и третий ,- из последовательно соединенных умножител частоты и фазовращател The known generator of the spectrum contains the master oscillator, to the output of which three parallel channels are connected, the first of which consists of a phase shifter, and the second and third, of serially connected frequency multipliers and a phase rotator

М , Однако в известном генераторе спектра амплитуда гармонических сост вл ющих спектоа небольшой величинй . .M, However, in a known spectral generator, the amplitude of the harmonic components of the spectrum is small. .

Цель изобретени - увеличение амплитуды гармонических составл ющих спектра.The purpose of the invention is to increase the amplitude of the harmonic components of the spectrum.

Поставленна цель достигаетс тем что в генератор спектра, содержащий ЗсЩсиощий генератор, к выходу которо го подключены три параллельных канала , первый из которых состоит из фазовращател , а второй и третий - из последовательно соединенных умножител частоты и фазовращател , введены последовательно соединенные генератор псевдослучайной последовательности и балансный модул тор, а также источник посто нного тока и три дифференциальных усилител , при этом к выходам каждого из фазовращателей трех параллельных каналов подсоединены входы соответствующих дифференциальных усилителей, выход каждого из которых соединен с выходом источника посто нного тока и другим вхо0 дом балансного модул тора, а вход генератора псевдослучайной последовательности подключен к выходу задающего генератора.The goal is achieved by the fact that a sequential generator consisting of a phase shifter and a second and third one of a serially connected frequency multiplier and a phase rotator are connected to the generator of the spectrum generator, which contains an ES generator, and a second and third generator of a serially connected frequency multiplier and phase shifter are inserted. modulator, as well as a DC source and three differential amplifiers, while the outputs of each of the phase shifters of three parallel channels are connected to the outputs of the corresponding differential amplifiers, the output of each of which is connected to the output of a DC source and the other input of a balanced modulator, and the input of a pseudo-random sequence generator is connected to the output of a master oscillator.

На фиг. 1 приведена структурна FIG. 1 shows structural

5 электрическа схема генератора спект ра; на фиг. 2 - временные диаграммы.5 electrical circuit of the spectrum generator; in fig. 2 - time diagrams.

Генератор спектра содержит задающий генератор 1, умножители частоты 2, фазовращатели 3, дифференциальные усилители 4, источник 5 по0 сто нного тока, генератор 6 псевдослучайной последоватзльности и балансный модул тор 7.The spectrum generator contains master oscillator 1, frequency multipliers 2, phase shifters 3, differential amplifiers 4, constant-current source 5, generator 6 of pseudo-random sequence and balanced modulator 7.

Генератор спектра работает сле5 дуквдим образом.The spectrum generator works as follows.

Задающий генератор 1 выдает гар монический сигнал с частотой F , умножители частоты 2 - сигналы с частотами 2 Р и 3 f . Каждый из тр The master oscillator 1 generates a harmonic signal with a frequency F, frequency multipliers 2 - signals with frequencies of 2 P and 3 f. Each of tr

Claims

0 signals pass successively the corresponding phase shifter, 3 and differential amplifier 4. The harmonic signals are summed at the first input of the balanced modulator of the 7 with a constant component 5. At the same time, a periodic sequence is formed with a period F of pulses of the time-limited sin type. x / x (Fig. 2 a). To the second input: the balanced modulator 7 enters in phase with the first pseudo random sequence with period N of generator b (Fig. 2 b). As a result, a bipolar pseudo-random sequence of sin x / x pulses is formed at the output (Fig. 2c). The spectrum of such a signal is described by the expression Q, -i, -s., Where R is the lattice function of the structure factor, S is the discrete spectrum of a periodic sequence of pulses with a period N. Thus, the function ft shows how much the amplitude of the harmonics increases in the spectrum of the pseudo-random sequence of pulses compared to the periodic sequence of the same period. The function R. is determined by the formula of the peak value of the auto-company bf, the relational function; lateral value of the autocorrelation function. So for the M-sequence, where n is the number of bits in the generator 6. Therefore, the longer the period of the sequence, the greater the number of games compared to the periodic sequence. The use of new elements and connections favorably distinguishes the proposed generator from the known one, since it allows one to significantly increase the amplitude of the harmonics without changing the signal sweep. As a result, its scope is expanded and the accuracy of measurements with it is improved. An inventive spectrum generator, comprising a master oscillator, to the output of which three parallel channels are connected, the first of which consists of a phase shifter, and the second and third are of serially connected frequency multipliers and a phase shifter, characterized in that in order to increase the amplitude of the harmonic components of the spectrum , a sequentially connected pseudo-random sequence generator and a balanced modulator, as well as a DC source and three differential amplifiers, are introduced, with the outputs azhdogo phase shifters of three parallel channels are connected respective inputs of the differential amplifiers are each output of which is connected to the output DC source and the other input baansnogo modulator and the input generaora pseudorandom follower connected to the output of the master for generators. Sources of information, rintye in-attention in the examination 1. French patent number 2234696, l. H 03 W 21/02, 06/22/73 (prototype)