SU1252925A1 - Versions of device for generating harmonic signal - Google Patents

Abstract

The invention relates to a pulse technique and can be used in devices for generating signals with the required 1 characteristics. The purpose of the invention is to increase the frequency stability and expand the functionality of the device. The device in the first embodiment contains a low frequency generator I, a frequency boosting unit 2, a high frequency generator 3, a frequency decreasing unit 4, blocks 5 and 6 of a narrowband phase locked loop, a high frequency generator 7, a multiplier 8, a frequency filter 9. The functional diagram of the second embodiment of the device for generating a harmonic signal and the description of the operation of the first and second versions of the devices are given in the description of the invention. 2 sec. f-ly, 2 ill. (L with Komtrsh a / yfuf Ut. F

Description

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The invention relates to a pulse technique and can be used in devices for generating signals with desired characteristics.

The purpose of the invention is to increase the frequency stability and expand the functionality of the device.

Fig. 1 shows a device for generating a harmonic signal in the first embodiment; FIG. 2 is the same in the second embodiment.

The device for generating a harmonic signal in the first embodiment contains a low-frequency generator 1, a frequency sweep unit 2, a high-frequency oscillator 3, a down frequency unit 4, blocks 5 and 6 of a narrow-phase frequency self-tuning, a high-frequency oscillator 7, correlator 8, Frequency sum filter 9, with multiplier 8 connected in series, frequency sum filter 9, down-frequency block 4, low-frequency oscillator 1 and block 2 as Frequency, the output of which is connected to the first inputs of blocks 5 and 6 of narrow-band phase auto-tuning, the outputs of which are connected respectively to the inputs of high-frequency generators 3 and 7, the outputs of which are connected respectively to the second inputs of blocks 5 and 6 of the narrow-band phase-locked tuning and the inputs of the multiplex 8, the output of which is connected to the noise control bus.

The device for generating a harmonic signal according to the second embodiment comprises a low-frequency generator 1, a frequency boosting unit 2, a high-frequency generator 3, a frequency decreasing unit 4, a phase detector

5, phase modulator 6, phase detector 7, phase 1 1 module 8, with the input and output of the low-frequency generator 1 connected to the inputs of the phase detector 5, the output of which is connected to the first noise control bus

and the first input of the phase modulator

6, the output of which is connected to the input of the low-frequency generator I, whose output through the frequency boosting unit 2 is connected to the first input of the phase modulator 8, the output of which is connected to the input of the high-frequency generator 3 and the first input of the phase detector 7, the output of which is connected to the second noise control bus and second

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the input of the phase modulator 8, and the second input - with the output of the high-frequency generator 3 and the input of the frequency reduction unit 4, the output of which is connected to the second input of the phase modulator 6.

The low-frequency generators 1 in devices in two versions can be made in the form of a quartz thermostatted generator operating in the megahertz range and having a high long-term frequency stability, which is ensured by operating with small oscillation levels on quartz.

The high-frequency generators 3 and 7 in the device according to the first variant and the high-frequency generator 3 in the device according to the second option can be V; They are made in the form of quartz oscillators operating in the range of hundreds of MHz with a high level of oscillation on quartz, which ensures high short-term frequency stability. Frequency blocks 2 and frequency blocks 4 in both embodiments of the device can be implemented based on frequency multipliers (dividers) or on the basis of subtractive and summing frequency mixers.

The phase modulators 6 and 8 in the device according to the second variant can be executed on the basis of an oscillatory circuit with controlled reactivity or a delay line with variable delay.

The apparatus for generating a harmonic signal in the first embodiment operates as follows.

Output c. low-frequency generator 1 enters block 2 for increasing frequency, where its frequency rises to the frequency of signals from high-frequency generators 3 and 7, which ensures the best synchronization conditions for these high-frequency generators. Switching on the inputs of generators 3 and 7 of blocks 5 and 6 of narrow-band phase-locked loop allows them to synchronize in a narrow band of frequencies, while their average frequencies are equal, and the fluctuation spectra outside the limits of phase-locked loops are independent. According to this, the signals are folded algebraically in the phase-locked frequency of the phase-locked loop, and geometrically outside, which provides an increase in the ratio

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The signal-to-noise ratio of the output signal of the multiplier 8, in which the output signals of high-frequency generators 3 and 7 are summed. frequency of the low-frequency oscillator signal 1. This allows synchronizing it at the fundamental harmonic, which provides better conditions for synchronizing the frequency in the oscillator ring, since the clamping band (synchronization) at the fundamentals second harmonic is maximum. The effect on the frequency of the ring generators, when operating at multiple harmonics, is always directed towards the mutual convergence of their frequencies, which expands the zone of their synchronous operation and increases the stability of the frequency of the output signal.

A device for generating a harmonic signal in the second embodiment works in a consistent manner.

The signal passes through the HHepi ioH narrowband link in the form of a low-frequency generator 1, which has a certain delay time. Therefore, phase fluctuations at its output can be distinguished using a phase detector 5 connected to its input and output with respect to fluctuations in frequency at its input. The phase fluctuations at the output of the high-frequency generator 3 with respect to the fluctuations of the frequency at its input are likewise distinguished by a phase detector 7 connected to the input and output of the high-frequency generator 3. The output signal of the phase detectors 5 and 7 with the phase modulators 6 and 8, included at the inputs of generators I and 3, respectively, suppress the phase fluctuations of these generators. The rest of the device works similarly to the device in the first embodiment, ie. the output frequency of the low-frequency generator i is raised in block 2 to increase the frequency to the frequency of the signal of high-frequency generator 3, which in turn decreases in block 4 to decrease the frequency to the frequency of the signal of low-frequency generator I. The synchronization of both generators in the device according to the second variant is the same frequencies as in the device in the first embodiment.

Thus, in the device dp of generating harmonic signals about the signal, the properties of the closed end of the generators are used most fully with the separation of phase fluctuations and their suppression by means of feedback.

The use of up and down blocks provides the best conditions for synchronizing the frequency of the generators at the fundamental harmonic, which increases the frequency stability of the output signal.

The use of narrow-band phase-locked blocks allows synchronizing the generators in a narrow frequency band, so that high long-term and short-term stability in the ring is communicated to the output signal, providing it with the sum of these qualities.

The use of a multiplier improves the signal-to-noise ratio of the output signal and c. using simple low-frequency spectrum analyzers, monitor fluctuations in the frequency of the output signal, which increases the reliability of its output parameters.

The use of phase modulators and phase detectors makes it possible to improve the spectrum of the output signal and create a source of a spectrally pure signal.

Claims (1)

1. A device for generating a harmonic signal, comprising low-frequency and high-frequency generators included in a closed ring, characterized in that, in order to increase frequency stability and enhance functionality, a frequency boosting unit, first and second blocks are added to it narrow-band phase-locked loop and a multiplier connected in series, a frequency filter and a down-frequency block whose output is connected to the input of a low-frequency generator The frequency is connected to the first inputs w of the first and second blocks of narrow-band phase-locked loop, the outputs of which are connected respectively to the inputs of high-frequency generators, the outputs of which are connected respectively to the second inputs of the first and second blocks of narrow-band phase-locked tuning and inputs of the multiplier that are connected to the noise control bus. 2, A device for generating a harmonic signal, comprising low-frequency and high-frequency oscillators included in a closed ring, characterized in that, in order to increase frequency stability and enhance functionality, the first and second phase detectors, the first and second phase modulators are additionally introduced into it , the block of frequency increase and frequency reduction, and you HeftrrtftQ b ujyfio Editor A. Kozoriz phi1,2 Compiled by E. Borzov Tehred M. Khodanych Order 4630/56 Circulation 816 Subscription VNIIPI USSR State Committee On affairs of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., D. 4/5 Production and printing company, Uzhgorod, st. Project, 4 the low-frequency generator stroke is connected to the first input of the first detector and through the frequency boosting unit to the first input of the first phase modulator, the output of which is connected to the input of the high-frequency generator and the first input of the second phase detector, the output of which is connected to the second input of the first phase modulator , and the second input - with the output of the high-frequency generator and through the block of the lower frequency. - with the first input of the second phase modulator, the second input of which is connected to the output of the first Phase detector, and you od - a low-frequency oscillator input and a second input of said first phase detector, the phase detector outputs are connected with the tire noise control. Noise control Proofreader M.Samborsk