CN106645212A - Broadband loop filter circuit with variable output band and microwave density detector - Google Patents
Broadband loop filter circuit with variable output band and microwave density detector Download PDFInfo
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- CN106645212A CN106645212A CN201611165932.7A CN201611165932A CN106645212A CN 106645212 A CN106645212 A CN 106645212A CN 201611165932 A CN201611165932 A CN 201611165932A CN 106645212 A CN106645212 A CN 106645212A
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- loop filter
- frequency range
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- filter circuit
- signal
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- 238000004891 communication Methods 0.000 claims description 7
- 230000011218 segmentation Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 8
- 238000001228 spectrum Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Electromagnetism (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention provides a broadband loop filter circuit with a variable output band and a microwave density detector. The circuit comprises a lower computer, a memory, an upper computer, a digital-to-analog converter, a loop filter and a voltage-controlled oscillator, wherein the lower computer is connected with the memory, the upper computer and the digital-to-analog converter via a signal separately; a plurality of reference voltage values of loop filter corresponding to various sub-sections of the output band are stored in the memory; the digital-to-analog converter is connected to a reference input end of the loop filter; the upper computer controls the digital-to-analog converter to output reference voltage to the loop filter through the lower computer; the loop filter is connected to the voltage-controlled oscillator via the signal; the loop filter correspondingly tunes voltage to the voltage-controlled oscillator on the basis of reference voltage output; and the voltage-controlled oscillator outputs a corresponding microwave signal on the basis of the tuned voltage. The broadband loop filter circuit has the beneficial effects that the broadband microwave signal can be output, frequency-expanding use of the signal is achieved, the band can be flexibly adjusted for output of the broadband signal and the band can be quickly locked.
Description
Technical field
The present invention relates to microwave density detector technical field, the variable broadband loop of more particularly to a kind of output frequency range
Filter circuit and microwave density detector.
Background technology
The of the same race mixed material measurement demand different to weight range in order to meet microwave density detector, needs output big
Scope microwave signal, frequency range is 5000MHz～6500MHz.In order that measurement more accurately extends measurement range simultaneously, no
The different signal output frequency range of same weight range correspondence, needs microwave signal in the range of 5000MHz～6500MHz and stepping
Under conditions of 1MHz, output signal being capable of quick lock in.In actual applications, for the testing requirement of Different Weight scope,
This requires that broadband signal is exported, and traditional technical scheme is frequency-division section design loop filter, according to different output frequency ranges
Also need to increase hardware exchange circuit, so increased the difficulty of design complexities and circuit debugging.Loop filter is that microwave is close
Vitals in degree detector, loop filter is a linear system, can play low pass filter effect, and it is by electricity
Resistance, electric capacity and operational amplifier composition, Main Function is to suppress noise and high fdrequency component, improves the purity of frequency spectrum of control circuit,
And the speed and precision of control loop phasing, improves the stability of system.
The content of the invention
It is an object of the invention to provide a kind of variable broadband loop filter circuit of output frequency range and microwave density inspection
Survey instrument, solving existing microwave density detector can not realize that broadband signal is exported and output frequency range is difficult to adjust asking for change
Topic.
The present invention provides a kind of output variable broadband loop filter circuit of frequency range, including slave computer, memory, upper
Machine, digital to analog converter, loop filter and voltage controlled oscillator；Slave computer is believed respectively with memory, host computer and digital to analog converter
Number connection, memory internal memory contain it is multiple with export frequency range and be respectively segmented the reference voltage numerical value of corresponding loop filter, digital-to-analogue
The reference input of transducer signal linkloop wave filter, host computer Jing slave computers control digital to analog converter output reference voltage
To loop filter, loop filter signal connection voltage controlled oscillator, loop filter is based on the corresponding tune of reference voltage output
Humorous voltage to voltage controlled oscillator, voltage controlled oscillator export corresponding microwave signal based on VT.
Further, the slave computer is single-chip microcomputer, and the host computer is computer.
Further, host computer is connected with slave computer Jing serial communication protocol signals.
Further, slave computer is connected with memory Jing serial communication mode signals.
Further, the scope for exporting frequency range is between 5000MHz to 6500MHz.
Further, export frequency range and be respectively segmented stepping for 1MHz.
The present invention also provides a kind of microwave density detector, including the broadband loop wave filter that above-mentioned output frequency range is variable
Circuit.
Compared with prior art, the variable broadband loop filter circuit of output frequency range of the invention have the characteristics that with
Advantage：
1st, the variable broadband loop filter circuit of output frequency range of the invention, can export wideband microwave signal, realize
The spread spectrum of signal is used, can be with flexible modulation frequency range and quick lock in frequency range to the output of broadband signal；
2nd, the variable broadband loop filter circuit of output frequency range of the invention, the preset parameter debugged of software, circuit
Simply, locking faster, can more meet the requirement of online measurement at a high speed；
3rd, microwave density detector of the invention, can export wideband microwave signal, and the spread spectrum for realizing signal is used, and meet
The wider mixed material measurement demand of the same race of weight range, extends the use range of microwave density detector；
4th, microwave density detector of the invention, can be with flexible modulation frequency range and quick lock in frequency to the output of broadband signal
Section, it is to avoid products-hardware is changed, and improves the efficiency of measurement.
After the specific embodiment of the present invention is read in conjunction with the accompanying, the features and advantages of the invention will become clearer from.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the connection figure that the embodiment of the present invention exports the variable broadband loop filter circuit of frequency range.
Specific embodiment
As shown in figure 1, the present embodiment provides a kind of output frequency range variable broadband loop filter circuit, including bottom
The components and parts such as machine, memory, host computer, digital to analog converter, loop filter and voltage controlled oscillator.Slave computer selects single-chip microcomputer,
Host computer selects computer, and computer Jing serial communication protocols signal connection single-chip microcomputer, computer is single by serial communication operation
Piece machine, by main control chip, single-chip microcomputer Jing serial communication modes (such as spi bus) signal connects memory with to storage to single-chip microcomputer
Device carries out online access and programming, and single-chip microcomputer signal connection digital to analog converter, memory internal memory contains multiple each with output frequency range
The reference voltage numerical value of corresponding loop filter is segmented, single-chip microcomputer reads reference voltage numerical value and delivers to digital to analog converter.Deposit
The reference voltage numerical value of reservoir memory storage can be modified by computer Jing single-chip microcomputers to reference voltage numerical value, it is also possible to logical
Cross the debugging interface of single-chip microcomputer carries out online burning or change to reference voltage numerical value, it is also possible to individually memory is carried out offline
Burning, increased the flexibility of programming, without the need for carrying out data search, shorten the locking time of broadband signal frequency range.Digital-to-analogue turns
The reference input of parallel operation signal linkloop wave filter, computer Jing Single-chip Controllings memory and digital to analog converter, monolithic
Machine reads corresponding reference voltage numerical value to digital to analog converter from memory, and digital to analog converter receives the reference voltage of single-chip microcomputer
Numerical value and output reference voltage are to loop filter.Loop filter signal connects voltage controlled oscillator, and loop filter is based on ginseng
The corresponding VT of voltage output is examined to voltage controlled oscillator to complete to export lock function, voltage controlled oscillator is based on VT
Export corresponding microwave signal.
The present embodiment also provides a kind of microwave density detector, including the variable broadband of above-mentioned output frequency range of the present embodiment
Loop filter circuit, will not be described here.
The variable broadband loop filter circuit of the output frequency range of the present embodiment or microwave density detector, its output frequency range
Scope be that between 5000MHz to 6500MHz, output frequency range is respectively segmented stepping for 1MHz, according to the micro- of traditional polytypic
Ripple density tester then needs 1500；The wideband for carrying out 5000MHz to 6500MHz using products-hardware change exports then cost
It is higher, complex operation, less efficient.The variable broadband loop filter circuit of the output frequency range of the present embodiment or microwave density inspection
Instrument is surveyed, 1500 reference voltage numerical value that corresponding loop filter is respectively segmented with output frequency range, monolithic are set in memory
Machine-readable some reference voltage numerical value taken in 1500 simultaneously delivers to digital to analog converter, and digital to analog converter receives the reference of single-chip microcomputer
Voltage value and output reference voltage to loop filter, loop filter are based on the above-mentioned corresponding tuning of reference voltage output
Voltage, to complete to export lock function, has accordingly locked the output frequency range of broadband signal, voltage controlled oscillator to voltage controlled oscillator
Corresponding microwave signal is exported based on VT.
To sum up, the variable broadband loop filter circuit of the output frequency range of the present embodiment, the preset parameter debugged of software,
Circuit is simple, and locking faster, can more meet the requirement of online measurement at a high speed, can export wideband microwave signal, realize signal
Spread spectrum is used, can be with flexible modulation frequency range and quick lock in frequency range to the output of broadband signal；The microwave density inspection of the present embodiment
Instrument is surveyed, wideband microwave signal can be exported, the spread spectrum for realizing signal is used, met the wider mixed material of the same race of weight range and survey
Amount demand, extends the use range of microwave density detector, and the output to broadband signal can be with flexible modulation frequency range and quick
Locking frequency range, it is to avoid products-hardware is changed, and improves the efficiency of measurement.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
Change, remodeling, addition or replacement that the technical staff in domain is made in the essential scope of the present invention, should also belong to the present invention's
Protection domain.
Claims (7)
- It is 1. a kind of to export the variable broadband loop filter circuit of frequency range, it is characterised in that：Including slave computer, memory, upper Machine, digital to analog converter, loop filter and voltage controlled oscillator；Slave computer is believed respectively with memory, host computer and digital to analog converter Number connection, memory internal memory contain it is multiple with export frequency range and be respectively segmented the reference voltage numerical value of corresponding loop filter, digital-to-analogue The reference input of transducer signal linkloop wave filter, host computer Jing slave computers control digital to analog converter output reference voltage To loop filter, loop filter signal connection voltage controlled oscillator, loop filter is based on the corresponding tune of reference voltage output Humorous voltage to voltage controlled oscillator, voltage controlled oscillator export corresponding microwave signal based on VT.
- It is 2. according to claim 1 to export the variable broadband loop filter circuit of frequency range, it is characterised in that：The bottom Machine is single-chip microcomputer, and the host computer is computer.
- It is 3. according to claim 2 to export the variable broadband loop filter circuit of frequency range, it is characterised in that：Host computer with Slave computer Jing serial communication protocols signal connects.
- It is 4. according to claim 2 to export the variable broadband loop filter circuit of frequency range, it is characterised in that：Slave computer with Memory Jing serial communication modes signal connects.
- It is 5. according to claim 1 to export the variable broadband loop filter circuit of frequency range, it is characterised in that：Output frequency range Scope be 5000MHz to 6500MHz between.
- It is 6. according to claim 5 to export the variable broadband loop filter circuit of frequency range, it is characterised in that：Output frequency range Each segmentation stepping is 1MHz.
- 7. a kind of microwave density detector, it is characterised in that can including the output frequency range any one of claim 1 to 6 The broadband loop filter circuit of change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611165932.7A CN106645212A (en) | 2016-12-16 | 2016-12-16 | Broadband loop filter circuit with variable output band and microwave density detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611165932.7A CN106645212A (en) | 2016-12-16 | 2016-12-16 | Broadband loop filter circuit with variable output band and microwave density detector |
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| Publication Number | Publication Date |
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| CN106645212A true CN106645212A (en) | 2017-05-10 |
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| CN201611165932.7A Pending CN106645212A (en) | 2016-12-16 | 2016-12-16 | Broadband loop filter circuit with variable output band and microwave density detector |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0823274A (en) * | 1994-07-08 | 1996-01-23 | Nec Corp | Pll frequency synthesizer |
| CN101741353A (en) * | 2008-11-07 | 2010-06-16 | 英飞凌科技股份有限公司 | Circuit with multiphase oscillator |
| CN102122957A (en) * | 2011-03-31 | 2011-07-13 | 海能达通信股份有限公司 | Phase-locking loop rapid locking circuit and method |
| CN103825589A (en) * | 2014-01-21 | 2014-05-28 | 中国电子科技集团公司第四十一研究所 | Dual-channel output microwave signal source amplitude stabilization control device |
| CN104022778A (en) * | 2014-06-24 | 2014-09-03 | 瑞斯康达科技发展股份有限公司 | Analog phase-locked loop circuit and signal processing method thereof |
| CN204190749U (en) * | 2014-11-03 | 2015-03-04 | 成都赛英科技有限公司 | High-purity frequency source |
| EP2905903A1 (en) * | 2014-02-05 | 2015-08-12 | Broadcom Corporation | Stacked synthesizer for wide local oscillator generation using a dynamic divider |
| CN104932379A (en) * | 2015-06-12 | 2015-09-23 | 中国电子科技集团公司第四十一研究所 | Realization method of frequency hopping signal source in microwave humidity and density detector |
-
2016
- 2016-12-16 CN CN201611165932.7A patent/CN106645212A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0823274A (en) * | 1994-07-08 | 1996-01-23 | Nec Corp | Pll frequency synthesizer |
| CN101741353A (en) * | 2008-11-07 | 2010-06-16 | 英飞凌科技股份有限公司 | Circuit with multiphase oscillator |
| CN102122957A (en) * | 2011-03-31 | 2011-07-13 | 海能达通信股份有限公司 | Phase-locking loop rapid locking circuit and method |
| CN103825589A (en) * | 2014-01-21 | 2014-05-28 | 中国电子科技集团公司第四十一研究所 | Dual-channel output microwave signal source amplitude stabilization control device |
| EP2905903A1 (en) * | 2014-02-05 | 2015-08-12 | Broadcom Corporation | Stacked synthesizer for wide local oscillator generation using a dynamic divider |
| CN104022778A (en) * | 2014-06-24 | 2014-09-03 | 瑞斯康达科技发展股份有限公司 | Analog phase-locked loop circuit and signal processing method thereof |
| CN204190749U (en) * | 2014-11-03 | 2015-03-04 | 成都赛英科技有限公司 | High-purity frequency source |
| CN104932379A (en) * | 2015-06-12 | 2015-09-23 | 中国电子科技集团公司第四十一研究所 | Realization method of frequency hopping signal source in microwave humidity and density detector |
Non-Patent Citations (2)
| Title |
|---|
| CHAO-HSIUNG TSENG ET AL.: "Design of Low Phase-Noise Microwave Oscillator and Wideband VCO Based on Microstrip Combline Bandpass Filters", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
| 刘健余 等: "一种基于DDS和PLL的Chirp超宽带信号源设计与实现", 《重庆邮电大学学报(自然科学版)》 * |
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