SU1226328A1 - Parallel spectrum analyser - Google Patents

Abstract

The invention relates to a measurement technique and can be used to analyze the amplitude frequency spectra of electrical signals. The purpose of the invention is to expand the functionality. This is achieved by measuring the spectra of continuous signals and periodic pulse signals with a high repetition rate, as well as measuring their instantaneous spectra. The device contains a wideband amplifier 1, N channels, each of which consists of a smooth filter 2, a detector 3, a backup device (charger) 4 and a display device 5, an amplitude detector 6, threshold devices 7 and 12, trigger 8, a block adjustable delay 9, integrator 10, source of constant voltage. KEYS 13 and 15 and the memory element 14 are part of the memory. f-ly, 1 ill. (L 1 h 9 O) CU9 y 00

Description

eleven

The invention relates to electrical measuring technique and can be used to analyze the amplitude frequency spectra of electrical signals.

The aim of the invention is to enhance the functionality of a spectrum analyzer by measuring the spectra of continuum signals and periodic pulsed signals with a higher repetition rate, including measuring their instant spectra.

The drawing shows a structural diagram of a spectrum analyzer.

The spectrum analyzer consists of a broadband amplifier 1, an output connected to the inputs of N channels, each of which consists of a series-connected band-pass filter 2, a detector 3, a storage device 4 and an indication device 5, connected to the output of the wideband amplifier 1 amplitude detector b, to the output of which a follower t is connected

but connected the first threshold device 7, the trigger 8, the adjustable delay unit 9, the integrator 10, the second input connected to the constant voltage source 11 and the second threshold device 2. The output of the adjustable delay unit 9 is connected in each channel to the first control input of the memory 4, the second control input of which is connected to the output of the second threshold device 12, to the second input of the trigger 8 and to the control input of the first threshold device 7 connected to the output of the amplitude detector 6. C The memory 4 is a serial connection of the key 13, the memory element 14 and the key 15. In this case, the input of the memory 4 is the key input 13, and its output is the connection point of the key output 13, the memory element 14 and the key input 15 whose output is connected to the common bus. The control inputs of the keys 13 and 15 are respectively the first and second control inputs of the memory 4.

Spectrum analyzer works as follows.

The input signal through a wideband amplifier 1 is fed to the bandwidth.

26328, 2

filters 2 and amplitude detector 6. The voltage of spectral components, allocated to band-pass filters 2, is fed to the inputs of the detectors

5 .3, The envelope voltage of the spectral component, amplified by the detector 3, is fed to the input of the memory device 4.

The spectrum analyzer has two modes of operation: Memory is on and Memory is off (auxiliary circuit for setting modes is not shown in the drawing).

During the installation of the mode, the memory is turned off, the key 13 is closed, the key 15 is open. In this mode, the voltage supplied to the storage device 4 from the output of the detector 3 is detected on the storage element 14 and

2Q is displayed on the display device 5. In the Memory mode, the envelope voltage of the signal under study is switched on from the output of the amplitude detector 6

25 is fed to the input of the threshold device 7. When this voltage exceeds the threshold level, the threshold device 7 is triggered, which in turn causes triggering of the trigger 8. The output signal of the trigger 8 is delayed For the required time, the variable delay unit 9 and the last time the control input of the memory device 4. In this case, the key 13 is opened and the voltage on the memory element 14 is memorized.

Thus, the moment of switching on the storage device is determined by the value of the threshold level of the threshold device 7 and the delay time of the delay unit 9.

The voltage from the output of the delay unit 9 also goes to the control input of the integrator 10 and switches it on. Since the second input of the integrator 10 is connected to a constant voltage source II, the voltage at the integrator output 10 begins to increase. When this voltage exceeds a threshold level, threshold device 12 is triggered.

The voltage from its output goes to the second control input of the storage device 4. At this, the key 15 is locked and the storage element 14 is discharged through this key. At the same time, the voltage from output 30

35

40

The horn device 12, which enters the second input of the trigger 8 and the control input of the threshold device 7, clears them.

In this case, after a time determined by the delay unit 9, the key 13 closes, as well as zeroing the integrator 10 and the threshold device 12. When the threshold device 12 is detected, the key 15 opens, and the threshold device 7 returns to its original state.

This completes the cycle of the spectrum analyzer.

Thus, switching on the storage device at any time on the signal duration interval, regardless of the nature of the input signal, as well as zeroing the storage device, allows measuring the spectrum including instantaneous both continuous and periodically repeating processes and conducting an express analysis of the measurement results. directly on the display device of the spectrum analyzer for a set time.

Claims (1)

1. A parallel spectrum analyzer containing a broadband amplifier with an amplitude detector and N channels connected to its output, each of which consists of a series-connected band-pass filter, a detector storing Compiled by E.Pacino. Editor R.Tsitsika Tekhred L.Oleinik Proofreader T. Kolb Order 2125/42 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4. display devices and devices, characterized in that, in order to expand the functionality of the device by measuring the spectra of continuous signals and periodic signals with a high repetition rate, the first threshold device, a trigger, an adjustable delay unit, an integrator, a second input connected to a DC voltage source and a second threshold device, the output of the adjustable delay block being connected in each channel to a first control input of a storage device, the second control input of which is connected to the output of a second threshold device, the second input of the trigger and to the control input of the first threshold device connected to the output of the amplitude detector. 2, the analyzer according to claim 1, wherein the storage device is implemented as a serial connection of the first key, the memory element and the second key, output connected to the common width 30 not, the input of the device is the input of the first key, its output is the connection point of the output of the first key, the memory element and the input of the second key, and the control inputs of both keys are respectively the first 35 and second control inputs of the memory.