CN105245225B - Low-frequency range arrowband synthetic source is converted into the circuit of high-frequency-band broadband synthetic source - Google Patents
Low-frequency range arrowband synthetic source is converted into the circuit of high-frequency-band broadband synthetic source Download PDFInfo
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- CN105245225B CN105245225B CN201510690218.9A CN201510690218A CN105245225B CN 105245225 B CN105245225 B CN 105245225B CN 201510690218 A CN201510690218 A CN 201510690218A CN 105245225 B CN105245225 B CN 105245225B
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Abstract
The invention provides the circuit that a kind of low-frequency range arrowband synthetic source is converted into high-frequency-band broadband synthetic source, the circuit includes low frequency synthetic source and change-over circuit, one end ground connection of low frequency synthetic source, the other end is connected with change-over circuit, change-over circuit is connected with synthesis source output terminal, change-over circuit is made up of five main circuits being connected, and main circuit includes the first main circuit, the second main circuit, the 3rd main circuit, the 4th main circuit and the 5th main circuit.The circuit passes through the modes such as frequency dividing, frequency multiplication, filtering and amplification, low frequency synthetic source is converted into the frequency band signals of 9 kinds of different multiples, the switching of a switch and an either-or switch is selected to select by controlling one four, the frequency range of different multiples is combined, then by being mixed and amplifying filtering twice, frequency range is finally given in 5GHz between 10GHz, the synthetic source with a width of 5GHz.Whole circuit control is simple, does not introduce phase-locked loop, whole circuit small volume, and cost is low.
Description
Technical field
The present invention relates to the synthesis technical field in synthetic wideband source, more particularly to a kind of low-frequency range arrowband synthetic source to be converted into
The circuit of high-frequency-band broadband synthetic source.
Background technology
In various measuring instruments at this stage, local vibration source of the synthetic wideband source as the machine mainly is used, by right
Local vibration source carries out the processing such as Up/Down Conversion, region filtering, obtains desired each frequency band signals, completes every work(of complete machine afterwards
Can, therefore the signal index of local vibration source determines the signal index of complete machine.On the premise of local vibration source high target is pursued, how to the greatest extent
The possible power consumption for reducing local vibration source, simplifies the control of local vibration source, while reduces the cost of local vibration source, improves the stabilization of local vibration source
Property, it is that current local vibration source development suffers from a problem that.
In the synthetic schemes in current synthetic wideband source, major programme has frequency multiplication/frequency dividing, Direct Digital
And PHASE-LOCKED LOOP PLL TECHNIQUE (PLL) (DDS).Wherein, simple frequency dividing/frequency multiplication scheme, it is desirable to obtain high-frequency-band broadband synthetic source, it is necessary to
Carry out process of frequency multiplication on the basis of the low frequency source in broadband, and use arrowband low frequency synthetic source, only by simple multiplication and division computing,
The covering of full frequency band can not be carried out to high-frequency-band broadband signal source.Direct Digital (DDS), although having resolution ratio
Height, the advantages that frequency accuracy is high, but its disadvantage is that working frequency is low, output frequency is usually no more than 500MHz,
The amplitude quantizing noise that the phase quantisation noise that is brought by digital technology and D/A conversion are brought simultaneously may cause very high total defeated
Go out noise level.And PHASE-LOCKED LOOP PLL TECHNIQUE is the frequency synthesis technique of main flow at this stage.
Phase-locked loop circuit mainly by phase discriminator (PD), loop filter (LPF), voltage controlled oscillator (VCO) and counts frequency dividing
The circuits such as device form.In the voltage controlled oscillator (VCO) of the 5GHz-10GHz bandwidth benchmark frequency high with an indices
On the basis of rate point, by will broadband VCO feedback signals 1/N frequency dividing after, obtain with reference frequency point identical frequency, by two kinds
Signal is sent to phase discriminator phase demodulation, obtained phase demodulation regulating error VCO, finally gives the synthetic source with reference frequency equal accuracy.
If simply using monocyclic carry out looped phase locking, because the signal in band is mutually made an uproar, index can be in multiple according to deterioration formula of mutually making an uproar
Deterioration, satisfied signal index can not be obtained, it is usually the case that using it is polycyclic lock phase scheme, by it is monocyclic lock phase in width
1/N frequency dividings with VCO feedback signals are substituted using sampling ring, are believed by VCO and the signal that M times of ring of sampling samples to obtain and benchmark
Number phase demodulation, the synthetic wideband source output signal in-band phase noise index so finally given then determine by sampling ring, certain journey
The in-band phase noise index of the optimization output signal of degree.But polycyclic lock phase scheme control excessively complexity, circuit is bulky,
And the multiple loops of introducing can increase circuit cost, increase circuit power consumption, reduce circuit stability.Obtained using phaselocked loop scheme
Synthetic wideband source because loop-locking needs the regular hour, frequency switching time can be increased, meanwhile, the phaselocked loop of introducing
Road it is more, it is necessary to frequency switching time it is longer.
The content of the invention
Complicated for being controlled existing for existing phase-locked loop circuit, circuit is bulky, and cost is higher, and circuit is not sufficiently stable
The problem of, the invention provides the circuit that a kind of low-frequency range arrowband synthetic source is converted into high-frequency-band broadband synthetic source.
The present invention uses following technical scheme：
Low-frequency range arrowband synthetic source is converted into the circuit of high-frequency-band broadband synthetic source, including low frequency synthetic source and conversion electricity
Road, one end ground connection of low frequency synthetic source, the other end are connected with change-over circuit, and change-over circuit is connected with synthesis source output terminal, conversion
Circuit is made up of five main circuits being connected, and main circuit includes the first main circuit, the second main circuit, the 3rd main circuit, the 4th
Main circuit and the 5th main circuit.
Preferably, first main circuit include be sequentially connected in series the first four-divider, eight frequency dividers, the first amplifier,
Low pass filter and power splitter, the second main circuit include two-divider and four and select a switch, and an output end of two-divider is straight
Four first input ends for selecting a switch are connect in succession, and another output end of two-divider selects a switch by frequency tripler connection four
The second input, four select the output end of a switch to be connected with the second four-divider, and the second four-divider is connected with the first mixing
Device, the first frequency mixer are connected with combiner；3rd main circuit is directly connected to four the 3rd inputs for selecting a switch, the power splitter
It is connected respectively with the first frequency mixer and combiner.
Preferably, the 4th main circuit includes varactor doubler, and a switch is selected in the output end connection four of varactor doubler
The 4th input, another output end of varactor doubler is connected with the first diode；5th main circuit includes the second diode
And either-or switch, the second diode connect either-or switch an input, another input of either-or switch with
First diode is connected, and the output end of either-or switch is connected with the second frequency mixer, and the second frequency mixer is connected with second
Amplifier, the second amplifier are connected with bandpass filter, and bandpass filter is connected with synthesis source output terminal；The combiner and
Two frequency mixers are connected.
Preferably, first diode and the second diode are all Schottky-barrier diode.
Preferably, the frequency range of the low frequency synthetic source in 1607MHz between 1642MHz, the band of low frequency synthetic source
A width of 35MHz.
The invention has the advantages that：
The invention provides the circuit that low-frequency range arrowband synthetic source is converted into high-frequency-band broadband synthetic source, and the circuit is by dividing
Frequently, the mode such as frequency multiplication, filtering and amplification, low frequency synthetic source is converted into the frequency band signals of 9 kinds of different multiples, by controlling one
Four select the switching of a switch and either-or switch selection, and the frequency range of different multiples is combined, then by being mixed twice and
Amplification filtering, frequency range is finally given in 5GHz between 10GHz, the synthetic source with a width of 5GHz.The circuit only needs to control
The frequency error factor of low frequency and narrow bandwidth synthetic source and two switch switchings can complete the conversion of synthetic source, and circuit control is simple, does not draw
Enter phase-locked loop, whole circuit small volume, cost is low.Relative to existing phase-locked loop circuit, what the present invention used mixes twice
Frequency lock phase scheme will not introduce the looped phase locking time, reduce the frequency switching time in synthetic wideband source, while obtain height and refer to
Target synthetic wideband source.
Brief description of the drawings
Fig. 1 is the circuit diagram for the circuit that low-frequency range arrowband synthetic source is converted into high-frequency-band broadband synthetic source.
Embodiment
The present invention is specifically described below in conjunction with the accompanying drawings：
With reference to Fig. 1, low-frequency range arrowband synthetic source is converted into the circuit of high-frequency-band broadband synthetic source, including low frequency synthetic source
F1.6GHzAnd change-over circuit, one end ground connection of low frequency synthetic source, the other end are connected with change-over circuit.Low frequency synthetic source be Low phase noise,
The input signal of high stability, low frequency synthetic source determine mutually make an uproar index and the frequency stabilization of final high-frequency-band broadband synthetic source
Degree.Low frequency synthetic source F1.6GHzFrequency range in 1607MHz between 1642MHz, a width of 35MHz of band of low frequency synthetic source.
Change-over circuit is connected with synthesis source output terminal, and change-over circuit is made up of five main circuits being connected, main circuit bag
Include the first main circuit, the second main circuit, the 3rd main circuit, the 4th main circuit and the 5th main circuit.
First main circuit includes the first four-divider 1, eight frequency dividers 2, the first amplifier 3, the LPF being sequentially connected in series
Device 4 and power splitter 5.
Second main circuit selects a switch 8 including two-divider 6 and four, and an output end of two-divider 6 is directly connected to four
Select the first input end of a switch 8, another output end of two-divider 6 selects the of a switch 8 by the connection of frequency tripler 7 four
Two inputs, four select the output end of a switch 8 to be connected with the second four-divider 9, and the second four-divider 9 is connected with the first frequency mixer
10, the first frequency mixer 10 is connected with combiner 11.Power splitter 5 in first main circuit respectively with the first frequency mixer 10 and combiner
11 are connected.
3rd main circuit is directly connected to four the 3rd inputs for selecting a switch 8.
4th main circuit includes varactor doubler 12, and the output end connection four of varactor doubler 12 selects the 4th of a switch 8
Input, another output end of varactor doubler 12 are connected with the first diode 13.
5th main circuit includes the second diode 14 and either-or switch 15, the second diode 14 connection either-or switch 15
An input, another input of either-or switch 15 is connected with first diode 13, either-or switch 15
Output end be connected with the second frequency mixer 16, the second frequency mixer 16 is connected with the second amplifier 17, and the second amplifier 17 is connected with
Bandpass filter 18, bandpass filter 18 are connected with synthesis source output terminal；The combiner 11 is connected with the second frequency mixer 16.
First diode and the second diode are all Schottky-barrier diode, utilize the non-linear spy of the first diode
Property, low frequency synthetic source F can be obtained1.6GHz4 subharmonic and 6 subharmonic；, can be with using the nonlinear characteristic of the second diode
Obtain low frequency synthetic source F1.6GHz3 subharmonic and 5 subharmonic.
The frequency band signals that power splitter 5 inputs the first frequency mixer are FIF1, the frequency range of the second four-divider the first frequency mixer of input
Signal is FLO1, the frequency band signals that combiner inputs the second frequency mixer are FIF2, the mixing of output end input second of either-or switch
The frequency band signals of device are FLO2, the frequency band signals of synthesis source output terminal output are FOUT。
The calculation formula and frequency range of each frequency band signals be：
Formula 1：(frequency range：50.21875MHz~51.25MHz)
Formula 2：
Formula 3：
Formula 4：
Formula 5：FOUT=FIF2+FLO2(frequency range：54Hz~10GHz）
The specific mixing operations of the output frequency of 1 each frequency band signals of table
The specific mixing operations of the output frequency of each frequency band signals of the (Continued) of table 1
The specific mixing operations of the output frequency of each frequency band signals of the (Continued) of table 1
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
The variations, modifications, additions or substitutions that the technical staff in domain is made in the essential scope of the present invention, it should also belong to the present invention's
Protection domain.
Claims (3)
1. low-frequency range arrowband synthetic source is converted into the circuit of high-frequency-band broadband synthetic source, it is characterised in that including low frequency synthetic source
And change-over circuit, one end ground connection of low frequency synthetic source, the other end are connected with change-over circuit, change-over circuit is connected with synthetic source output
End, change-over circuit are made up of five main circuits being connected, and main circuit includes the first main circuit, the second main circuit, the 3rd main electricity
Road, the 4th main circuit and the 5th main circuit；
First main circuit include be sequentially connected in series the first four-divider, eight frequency dividers, the first amplifier, low pass filter and
Power splitter, the second main circuit select a switch including two-divider and four, and an output end of two-divider is directly connected to four and selects one
The first input end of switch, another output end of two-divider select the second of a switch to input by frequency tripler connection four
End, four select the output end of a switch to be connected with the second four-divider, and the second four-divider is connected with the first frequency mixer, the first mixing
Device is connected with combiner；3rd main circuit is directly connected to four the 3rd inputs for selecting a switch, and the power splitter is respectively with first
Frequency mixer is connected with combiner；
4th main circuit includes varactor doubler, and the output end connection four of varactor doubler selects the 4th of a switch to input
End, another output end of varactor doubler are connected with the first diode；5th main circuit includes the second diode and alternative is opened
Close, the second diode connects an input of either-or switch, another input of either-or switch and the described 1st
Pole pipe is connected, and the output end of either-or switch is connected with the second frequency mixer, and the second frequency mixer is connected with the second amplifier, and second
Amplifier is connected with bandpass filter, and bandpass filter is connected with synthesis source output terminal；The combiner and the second frequency mixer phase
Even.
2. low-frequency range arrowband according to claim 1 synthetic source is converted into the circuit of high-frequency-band broadband synthetic source, its feature
It is, first diode and the second diode are Schottky-barrier diode.
3. the low-frequency range arrowband synthetic source according to any one of claim 1 and 2 is converted into the electricity of high-frequency-band broadband synthetic source
Road, it is characterised in that the frequency range of the low frequency synthetic source in 1607MHz between 1642MHz, the bandwidth of low frequency synthetic source
For 35MHz.
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| CN201947248U (en) * | 2011-02-11 | 2011-08-24 | 成都联帮微波通信工程有限公司 | S wave band agile frequency synthesizer |
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| US6570458B2 (en) * | 2001-06-12 | 2003-05-27 | Teradyne, Inc. | Low noise microwave synthesizer employing high frequency combs for tuning drift cancel loop |
| US8159208B2 (en) * | 2007-12-20 | 2012-04-17 | Anritsu Company | Hand-held microwave spectrum analyzer with operation range from 9 KHz to over 20 GHz |
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| CN201947248U (en) * | 2011-02-11 | 2011-08-24 | 成都联帮微波通信工程有限公司 | S wave band agile frequency synthesizer |
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| S波段低相噪频率合成器研究;徐铭海;《万方》;20140917;第17-24页 * |
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