RU16682U1 - SELECTIVE SIGNAL MEASUREMENT DEVICE - Google Patents

Abstract

1. A device for selective measurement of signals, comprising an input device, three frequency converters, a terminal intermediate frequency converter, a video filter, a measuring unit and two sub-frequency band switches, the first output of the first switch is connected to the first input of the second switch, and the second output is connected to the input of the first frequency converter the output of which is connected to the second input of the second switch, the output of the third frequency converter is connected to the input of the chain from a series connection data of the terminal frequency converter, intermediate frequency unit, video filter and measuring unit, characterized in that the third and fourth subband frequency switches are inserted into it, the output of the input device is connected to the input of the third switch, the first output of which is connected to the input of the second frequency converter, and the second output connected to the input of the first switch, the output of the second frequency converter is connected to the first input of the fourth switch, the second input of which is connected to the output of the second switch, and the output of the fourth switch is connected to the input of the third frequency converter, the first frequency converter being made in the frequency ranges 0.009-46 MHz and 860-900 MHz, the second frequency converter in the frequency range 900-2150 MHz, the third frequency converter in the frequency range 46- 960 MHz and a terminal frequency converter for a frequency of 34.8 MHz. 2. The device according to claim 1, characterized in that the first frequency converter comprises an electronic switch at the input, the first output of which is connected to a

Description

The utility model relates to radio measurement technology, in particular to measuring reception, spectrum analysis and selective voltage measurement, and can be used in serial superheterodyne spectrum analyzers, measuring superheterodyne panoramic receivers, including sequential analysis superheterodyne panoramic receivers and selective superheterodyne selective voltmeters.

Superheterodyne measuring devices (SIP): receivers, spectrum analyzers, selective voltmeters - are designed to measure amplitudes (or their ratios) and frequencies of many input signals.

Known panoramic receivers and spectrum analyzers designed for the selective measurement of signals by superheterodyne conversion to an intermediate frequency and filtering signals on it (Martynov V.A., Selikhov Yu.A. Panoramic receivers and spectrum analyzers, Sovetskoe Radio, 1980, chap. 1, 2.7; SU, Aut. St. No. 1095091, M1SI G01R 23/16, 05.30.84).

Known measuring receiver type EB 100 Miniport Empfanger company Rode Schwartz Germany. This device is taken as the closest analogue of the technical nature of the claimed. A simplified block diagram of this device is shown in FIG. 1.

The signal conversion path in this device is standard for SIP and consists of an input device including a preselector and an attenuator, sub-band switches (from 20 to 500 MHz and from 500 to 1000 MHz), four stages of frequency conversion (IF), including a mixer, a local oscillator, an amplifier for the intermediate frequency of the IF amplifier, two sub-band switches (from 20 to 500 MHz and from 500 to 1000 MHz), an intermediate frequency unit, including a filter for the main FOS and UPCH selection, a detector unit and a measuring unit.

The disadvantage of this device, as well as the above devices, is the complexity and cumbersomeness of their implementation due to the fact that the breakdown of the received frequency range into subbands, intermediate frequencies in frequency converters and local oscillator frequencies in known devices do not coincide with those used in mass radio engineering devices. This leads to the need for special devices.

(volume resonator generators, voltage controlled oscillators, YIG generators, filters, etc.) and does not allow the use of standardized, inexpensive standard radio modules, microassemblies, and microcircuits.

The technical problem, which this utility model is aimed at, is to create a compact, low-cost, with enhanced functionality, device for selective signal measurement due to the use of standardized microcircuits for its circuit implementation, published in large series for television and communication devices. For this, a wide working (widely used as a connected) frequency range from 0.009 to 2150 MHz is divided into subbands using separate frequency converters in each of them with correspondingly chosen intermediate frequencies.

The essence of the utility model is that in a device for selective measurement of signals containing an input device, three frequency converters, an intermediate intermediate frequency converter, a video filter, a measuring unit and two frequency subband switches, in which the first output of the first switch is connected to the first input of the second switch, and the second output is connected to the input pfvogo

the frequency converter, the output of which is connected to the second input of the second switch, the output of the third frequency converter is connected to the input of the chain of series-connected terminal frequency converter, including the amplification-conversion unit of the terminal intermediate frequency and the detector, video filter and measuring unit, introduced the third and fourth sub-band switches frequency, the output of the input device is connected to the input of the third switch, the first output of which is connected to the input of the second converter frequency converter, and the second output is connected to the input of the first switch, the output of the second frequency converter is connected to the first input of the fourth switch, the second input of which is connected to the output of the second switch, and the output of the fourth switch is connected to the input of the third frequency converter, and the first frequency converter yes1 frequency ranges 0.009 - 46 MHz and 860 - 900 MHz, second frequency converter for the range 900 - 2150 MHz, third frequency converter for the range 46 - 860 MHz and terminal converter intermediate frequency 34.8 MHz.

The first frequency converter contains an electronic switch at the input, the first output of which is connected to the first input of the generator - mixing unit through a low-pass filter. if the second input of which is connected through a band-pass filter to the second output of the electronic switch, the third and fourth outputs of the generator-mixing block are connected through the electrically tunable oscillatory circuits of the local oscillators to the output of the frequency synthesizer, the input of which is connected to the output of the generator-mixing block, the second output of which is connected to the strip filter, the output of which is the output of the frequency converter, and the generator - mixing unit is made on a chip type TDA 5636, and the synthesizer is an hour the one on a chip like TSA 5522.

The second frequency converter contains a chain of series-connected amplifier, the input of which is the input of the frequency converter, a bandpass filter with electronic tuning, a frequency mixer, an amplifier, an intermediate-frequency bandpass filter and an output amplifier, the output of which is the output of a frequency converter, an electrically tunable is connected to the second input of the mixer hegerodsch, the second output of which is connected to the input of the frequency synthesizer, the output of which is connected to the second input of the band phi tra and oscillator tuning input, wherein the frequency synthesizer is configured

on a chip type SP 5055 or the entire frequency converter can be performed on a module type BSS 479 TAGOK Comtech LTD.

The third frequency converter contains an electronic switch at the input, the outputs of which are connected through the ruinance amplifiers to the inputs of the mixers of the generator-mixing unit, the oscillatory circuits of the local oscillators are connected to the inputs of the austere elements of the heterodyans, to the varicaps of which the output of the frequency synthesizer is connected, also connected to the tuning inputs of the resonant amplifiers, the input of the frequency synthesizer is connected to the output of the generator - mixing unit, the other output of which is the output of the frequency converter you, wherein the generator - a mixing unit is arranged on a chip type TDA 5636, and sintetator frequencies on a chip type TSA 5522 or as frequency converter module can be employed type KS-H-132/134/136 firm Selteka, Lithuania.

The terminal frequency converter contains a mixing amplifier unit including three amplifiers, a mixer, and a logarithmic amplifier / detector, the input of the first amplifier is the input of the converter, the output of the amplifier is fien with the first input of the mixer, the second input of which is connected to the output of the frequency synthesizer through the second amplifier, and between the output of the third an amplifier connected to the output of the mixer and the input

the logarithmic amplifier-detector of the mixing-amplifier unit includes a chain of series-connected filter unit of the main selection and the attenuator of the intermediate frequency, the output of the logarithmic amplifier is the output of the frequency converter, and the mixing and amplifying unit is made on a chip like AD 608, the frequency synthesizer on a chip like AD 9851, and an intermediate frequency attenuator on an AD 603 type chip.

In FIG. 2 shows a block diagram of the proposed device, FIG. 3 is a block diagram of a first frequency converter, FIG. 4 is a block diagram of a second frequency converter, FIG. 5 is a block diagram of a third frequency converter; FIG. 6 is a block diagram of a terminal frequency converter.

The device consists of a signal conversion path, including the input device VU1 (preselector and attenuator), the first switch 2, the first output of which is connected to the first input of the second switch 3, and the second output is connected to the input of the first frequency converter 4, the output of which is connected to the second input of the second switch 3, the output of the input device is connected to the input of the third switch 5, the first output of which is connected to the input of the second converter 7 frequency 6, and the second output is connected to the input of the first switch 2, the output of the second frequency converter 6 is connected to the first input of the fourth switch 7, the second input of which is connected to the output of the second switch 3, and the output of the fourth switch 7 is connected to the input of the third frequency converter 8, the output of which is connected to the input of the chain from the series-connected terminal converter frequency 11, including an intermediate frequency converter 9 and a detector 10, a video filter 12 and a measuring unit 13. The reference frequencies are formed for the synthesizers of the converters pilots at 4, 6, 8, 9, generator 14 and a reference crystal oscillator 15.

The first frequency converter is made for the frequency ranges 0.009 - 46 MHz and 860 - 900 MHz and contains an electronic switch 16 at the input, the first output of which through a low-pass filter 17 is connected to the first input of the generator-mixing unit 18, the second input of which is connected through a tunable band-pass filter 19 to the second output of the electronic switch 16, the third and fourth inputs of the generator-mixing unit 18 are connected to the oscillatory circuits of the local oscillators 20,21 of which the varicaps are connected to the output of the frequency synthesizer 22, the input of which connected to the output of the generator-mixing block 18, the second output of which is coupled to a band-pass filter 23, the output of which is the output of the frequency converter 4. The generator-mixing block 18 is made on a TDA 5636 type microcircuit and includes frequency mixers 24, active elements of the local oscillators 25 and buffer amplifiers 26. Frequency synthesizer 22 is made on a TSA 5522 type chip and contains a local oscillator frequency divider 27, a phase detector 28, and a reference frequency divider 29.

The second frequency converter 6 is made in the range 900 - 2150 MHz and consists of a series-connected amplifier 30, the input of which is the input of the frequency converter 6, a bandpass filter with electronic tuning 31, mix frequency 32, amplifier 33, band-pass filter of intermediate frequency 34 and output amplifier 35 the output of which is the output of the frequency converter 6, a local oscillator 36 is connected to the second input of the mixer 32, the second output of which is connected to the input of the frequency synthesizer 37, the output of which is connected to the second input losovogo filter 31 and local oscillator 36 input.

The frequency synthesizer is made on a SP 5055 type circuit and includes a frequency divider 27, a phase detector 28, and a reference frequency divider 29.

the third frequency converter 8 is made in the range 46 - 860 MHz and contains an electronic switch 38 at the input, the outputs of which are connected through resonant amplifiers 39 - 41 to the inputs of the mixers 24 of the generator-mixing unit 42, to the inputs of the active elements of the local oscillators 25 which is dragged through the oscillatory circuits of the local oscillators 43-45 the output of the phase detector DETOESTOR 28 of the frequency synthesizer 46, connected also to the tuning inputs of the resonant amplifiers 39 - 41, the input of the frequency divider hegodynos 27 of the frequency synthesizer 46 is connected to the buffer output cada of local oscillators 47 of the generator - mixing unit 42, the output of the output stage of the intermediate frequency 48 of which is connected to the input of the bandpass filter 49, the output of which is the output of the frequency converter. Generator - mixing block 42 is made on a chip type TDA 5636. The frequency synthesizer is made on a chip type TSA 5522 and contains a local oscillator frequency divider 27, a phase detector 28 and a reference frequency divider 29.

The entire frequency converter circuit can be performed on a module of the type KS-H-132/134/136 from Selteka, Lithuania.

The terminal converter of the intermediate frequency 34.8 MHz, (which is the central frequency of the intermediate frequency path of standard television receivers) to the terminal

- / s the intermediate frequency of 17.628 or 10.7 MHz, contains a mixing amplifier - detector unit 50, which includes a chain of series-connected amplifier 51, the input of which is the input of the frequency converter, mixer 52, amplifier 53, logarithmic amplifier-detector 54, the output of which is the output a frequency converter, and a third amplifier 55, connected by an output to the second input of the frequency mixer 52, and by an input to the output of the frequency synthesizer 56, and between the output of the amplifier 53 and the input of the logarithmic amplifier-detector 54 lyuchena chain of series-connected filter unit 5 and the main selection attenuator 58. Smesitelnousilitelny intermediate frequency-detection unit 50 is formed on the chip type AD 608, a frequency synthesizer 56 to mshfoskheme type AD 9851, and the intermediate frequency attenuator 58 on the chip-type BP 603.

The device operates as follows.

The principle of operation of a device for selective measurement of a signal, which is a superheterodyne meter, is based on converting the frequencies of input signals in the range of 0.009 - 2150 MHz to a final intermediate frequency, for example 17.628 MHz, at which the main filtering and amplification of the signal to a level sufficient for the detector to work, converting an intermediate frequency into a video signal,

. - // arriving at the measuring unit and outputting the measurement result to the indicator device.

The signal fed to the high-frequency input of input device 1 in the range 0.009 - 2150 MHz passes through the input attenuator, which, when strong input signals are received, prevents overloading of subsequent signals, where it is divided into four channels:

900-2150 MHz; 46-860 MHz; 0.009-46 MHz; 860-900 MHz

A signal with a frequency of 0.009 - 46 MHz and 860 - 900 MHz is converted in the IF unit 4 to an intermediate frequency of 80 MHz. A signal with a frequency of 900 - 2150 MHz is converted in the IF unit 6 to an intermediate frequency of 479.5 MHz. Signals with frequencies of 80 MHz and 479.5 MHz (which is the standard second intermediate frequency of satellite television receivers) are fed to the IF unit 8, where they are converted to an intermediate frequency of 34.8 MHz. The IF unit 8 independently operates in the frequency sub-range of 46 - 860 MHz, when signals of 80 MHz and 479.5 MHz are fed to it, it starts to operate in the fixed frequency mode. The intermediate frequency signal 34.8 MHz is then amplified, filtered and fed to the IF unit 9, where after passing through the mixer we get the final intermediate frequency 17.628 MHz. In the frequency inverter terminal 11, the main filtering occurs, and the necessary

gain to a level sufficient for the operation of the children's city 10, where it turns into a video signal. In the block of the video filter 12, the video signal is filtered, which then enters the analog-to-digital converter of the measuring unit 13, where it is converted into a code proportional to the level of the signal detected in the detector 10. Indication of the measured signal is also carried out in the measuring unit 13. The frequency synthesizers of the inverter units 4, 6, 8, generate signals that control the frequencies of the electrically tunable inverter data generators and ensure the capture of their frequency in discrete values of the frequency m 4 / n MHz, where m is the division factor the local oscillator frequency, n is the division ratio of the reference frequency of 4 MHz. The IF unit 9 synthesizer is a direct digital synthesis chip with a very small frequency discretion (up to fractions of a hertz) at a reference frequency of 30 MHz. The reference frequencies of 4 MHz and 30 MHz, determined by the designs of the synthesizers, the coefficients m and n, as well as the direct synthesis frequency code are set by the measuring unit 13, are formed by the reference crystal oscillator 15 and the reference frequency driver 14.

In the inverters 6 and 8, the local oscillator frequencies are unified with the corresponding frequencies of the television channel selectors (tuners). In the inverter 4

. - / 3 intermediate frequency (80 Msch) can vary in such a range that its local oscillator frequencies do not go beyond,

normalized by TDA 5636 and TSA 5522 microcircuits.

Practical implementation of the device

The subband 46 - 860 MHz is unified with the meter and cable ranges used in television; it is overlapped by two TDA 5636 and TSA 5522 microcircuits (frequency converter 8).

The 900 - 2150 MHz subband is unified with the element base base to the range of the first intermediate frequency of satellite television receivers and can be blocked using transistors BF 904 or BF 908 and microcircuit SP 5055 (frequency converter 6).

Frequency subbands 0.009 - 46 MHz and 860 - 900 MHz can be blocked using TDA 5636 and TSA 5522 microcircuits used in the frequency subband 46 - 860 MHz (frequency converter 4).

The utility model makes it possible to use in the subbands 46 - 860 MHz and 900 - 2150 MHz certain types of television tuners uploaded by modules (KS-H-132/134/136 from Selteka, Lithuania, BSS 479 TAIDN from Comtech LTD).

- U

Sintua microcircuits in television have a rather large tuning discretion (up to 250 kHz) and, therefore, for smooth tuning in this utility model, a direct digital synthesis chip (AD 9851 chip) is used as a local oscillator in the final conversion (frequency converter 9).

The remaining blocks of the device for selective signal measurement are performed according to known schemes of similar meters: 1 - input device: low-pass filter on LC elements and an attenuator;

2, 3, 5, 7 - electronic switches of the MGS 700 08 type; 4, 6, 8, 9 - frequency converters, their implementation is described above and shown in FIG. 3-6;

.12 - the video filter is made in the form of an integrating chain with a variable time constant;

13 - measuring unit provides control of all units of the device and performs registration of measurement results. In modern devices of a similar purpose, measuring units are based on microprocessors with internal software.

 U6-Industrial applicability of the selective signal device lies in the fact that it allows you to create compact, cheap and versatile measuring receivers with the possibility of spectral analysis, which can carry out: measurement of false signals, spurious generation, search and measurement of interference, measurement of frequencies of unknown signals, level measurement television signals, spectrum analysis during testing and development of signal sources, etc.

 y f Formula

Claims (7)

1. A device for selective measurement of signals, comprising an input device, three frequency converters, an intermediate frequency converter, a video filter, a measuring unit and two sub-frequency bands, the first output of the first switch is connected to the first input of the second switch, and the second output is connected to the input of the first frequency converter the output of which is connected to the second input of the second switch, the output of the third frequency converter is connected to the input of the chain from a series connection data of the terminal frequency converter, intermediate frequency unit, video filter and measuring unit, characterized in that the third and fourth subband frequency switches are inserted into it, the output of the input device is connected to the input of the third switch, the first output of which is connected to the input of the second frequency converter, and the second output connected to the input of the first switch, the output of the second frequency converter is connected to the first input of the fourth switch, the second input of which is connected to the output of the second switch, and the output of the fourth switch is connected to the input of the third frequency converter, the first frequency converter being made in the frequency ranges 0.009-46 MHz and 860-900 MHz, the second frequency converter in the frequency range 900-2150 MHz, the third frequency converter in the frequency range 46- 960 MHz and a terminal frequency converter at a frequency of 34.8 MHz.  2. The device according to claim 1, characterized in that the first frequency converter comprises an electronic switch at the input, the first output of which is connected through a low-pass filter to the first input of the generator-mixing unit, the second input of which is connected through a band-pass filter to the second output of the electronic switch, the third and fourth outputs of the generator-mixing unit through electrically tunable oscillatory circuits of the local oscillators are connected to the output of the frequency synthesizer, the output of which is connected to the output of the generator-s kneading unit, the second output of which is connected to a band-pass filter, the output of which is the output of the frequency converter, moreover, the generator-mixing unit is made on a chip type TDA 5636, and the frequency synthesizer on a chip type TSA 5522.  3. The device according to paragraphs. 1 and 2, characterized in that the second frequency converter comprises a chain of series-connected amplifier, the input of which is the input of the frequency converter, a bandpass filter with electronic tuning, a frequency mixer, an amplifier, an intermediate-frequency bandpass filter and an output amplifier, the output of which is the output of a frequency converter , an electrically tunable local oscillator is connected to the second input of the mixer, the second output of which is connected to the input of the frequency synthesizer, the output of which is connected to toromu entry tunable bandpass filter and a frequency control input of the local oscillator, wherein the frequency synthesizer is configured on a chip type SP 5055.  4. The device according to claim 3, characterized in that the second frequency converter is made on a module of type BSS 479 TAIDN.  5. The device according to paragraphs. 1-4, characterized in that the third frequency converter contains an electronic switch at the input, the outputs of which are connected through resonant amplifiers to the inputs of the frequency mixers of the generator-mixing unit, to the inputs of the active elements of the local oscillators connected oscillatory circuits of the local oscillators, to the varicaps of which the output of the frequency synthesizer is connected also connected to the tuning inputs of the resonant amplifiers, the input of the frequency synthesizer is connected to the output of the generator-mixing unit, the other output of which is I output the frequency converter, and the generator-mixing block is made on a chip type TDA 5636, and the frequency synthesizer on a chip type TSA 5522.  6. The device according to claim 5, characterized in that the third frequency converter is made on a module of the type KS-H-132/134/136. 7. The device according to paragraphs. 1-6, characterized in that the terminal frequency converter contains a mixing amplifier unit comprising three amplifiers, a mixer and a logarithmic amplifier detector, the input of the first amplifier is the input of the terminal converter, the output of the amplifier is connected to the first input of the mixer, the second input of which is through the second amplifier connected to the output of the frequency synthesizer, and between the output of the third amplifier, turned on at the output of the mixer, and the input of the logarithmic amplifier-detector, a chain of series-connected x block main selection filters and attenuator intermediate frequency, the output of the logarithmic amplifier of the mixing block is the output of the frequency converter, wherein the mixing and amplifying unit is arranged on a chip type AD 608, on-chip frequency synthesizer type AD 9851, and attenuator intermediate frequency chip type BP 603.