SU1413543A1 - Sequential-type spectrum analyzer - Google Patents

Abstract

The invention can be used, in particular, when creating a means of spectral analysis. A serial-type spectrum analyzer contains an input unit 2, a mixer 3, an intermediate frequency amplifier 4 with a resonant electoral system 5, detectors 6, 14, an indicator 7, a sweep generator 8, a tunable local oscillator 9, a recirculator 10, two parallel-connected switches II, an amplifier 13 , a low pass filter 15 and a gain control 16. The analyzer provides a mode for measuring the parameters of the spectrum of one-time and rarely repeated signals in a wide dynamic range with an optimal analysis time. 1 il.

Description

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The invention relates to radio engineering, in particular, to radio measuring devices, and can be used to create means of spectral analysis.

The purpose of the invention is to improve the functionality of a spectrum analyzer of the sequential type, which consists in providing the mode of measurement of the parameters of the spectrum of single and rarely repetitive signals in a wide dynamic range at an optimal analysis time.

The drawing shows a block diagram. the proposed device.

The device consists of a spectrum analyzer 1 of a serial type, containing a serially connected input unit 2, a mixer 3, intermediate frequency amplifier 4 (IF amplifier) with a resonant system 5, a detector 6, an oscillographic indicator 7, a sweep generator 8 and a tunable local oscillator 9, controlled sweep generator, recirculator 10, two keys connected in parallel

I1 and automatic gain control 1 2 (AGC) containing a sequence. The AGC amplifier 13, the second detector 14, the low-pass filter 15 and the gain controller 16 are connected.

The control input of the local oscillator 9 is connected to the output of the generator 8 of the unwrapped Ik, and the output is connected to the second input of the

system 3. The second input of the indicator 7 is connected to the output of the generator 8 sweep. Control input UPCH 4 is connected to the output of gain control 16. The recirculator input-output is connected to the input of the amplifier 13 AGC and the first of two parallel-connected switches 1 1 to the input of the mixer 3. The second switch is connected to the resonant system 5.

The device works as follows.

Two keys connected in parallel

I1 is set to single-signal analysis mode, and their contacts are closed. The keys can also function as an AGC power switch and a recirculator when analyzing repeated signals. The signal through the input unit 2, which performs the function of the interface device, is fed to the input of the mixer 3 and the combined input-output recirculator 10. The local oscillator 9 scans

frequency is synchronous with the sweep on the screen of the indicator 7, determined by the sweep generator 8. At the time of arrival of the signal at mixer 3, a signal appears at its output proportional to the level of the signal from the local oscillator 9. UPCH 4 with the resonant system 5 selects one of the frequency components of the signal at a frequency equal to the sum or difference of the tuning frequencies of the resonant system 5 and the local oscillator 9. The next pulse (signal) is fed to the input of the mixer 3 through the time determined by recirculator 10 (). During this time, the analyzer is tuned in frequency by the value of P, etc. The gain of the IFAC 4 is affected by AGC Forward, which compensates for a decrease in the signal amplitude by increasing the gain under the influence of the control signal from the gain controller 16 produced by the control voltage taken from the filter 15 and proportional to the amplitude of the envelope signal received by the detector 14 AGC detecting the signal coming from the recirculator 10 through

amplifier 13 AGC.

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Effectively, the device can be used at analysis frequencies above units of megahertz, since in the lower part of the frequency range, digital spectrum analyzers can be used more efficiently by analyzing the spectrum of single-signal signals. Using the proposed device, it is possible to conduct a spectrum analysis in a wide dynamic range of very short signals, since the viewing band of a spectrum analyzer of the sequential type can be tens of gigahertz. Use of the device is effective when real-time analysis is not required.

Claims (1)

The formula of the invention. neither A spectrum analyzer of the sequential type, containing a series-connected input unit, a mixer, an intermediate frequency amplifier with a resonant electoral system, a detector and an indicator, as well as a series-connected sweep generator and tunable local oscillator, the output of the local oscillator being connected to 31А135434 the second input of the mixer, and the output of the gene-parallel-connected switch key and scanner are also connected to an successively connected amplifier, to the second input of the indicator, about the t and the second detector, the filter of low frequency and for the purpose of butts and an amplification controller, the input-expansion of the functional possible-output of the recirculator is connected to the input of circuits, which consists in providing an automatic gain controller for measuring the parameters of the spectrum parameters through the first key to the input of the mixer one-time and rarely repeated, and the output of the gain controller of the signals in a wide dynamic range with the control input of the amplifier at the optimum time of the analysis of the intermediate frequency, the second key after, the recirculator entered in it, connected to the resonant system.