CN107395200A - A kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard - Google Patents
A kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard Download PDFInfo
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- CN107395200A CN107395200A CN201710725150.2A CN201710725150A CN107395200A CN 107395200 A CN107395200 A CN 107395200A CN 201710725150 A CN201710725150 A CN 201710725150A CN 107395200 A CN107395200 A CN 107395200A
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- 229910052701 rubidium Inorganic materials 0.000 title claims abstract description 23
- 238000012546 transfer Methods 0.000 title claims abstract description 23
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 17
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 17
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000013078 crystal Substances 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000010354 integration Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- 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
- H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
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- 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
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/20—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a kind of ultra-low noise frequency synthesis for rubidium frequency standard and Frequency Transfer circuit, including the first power splitter, also include Frequency Transfer analog phase-locked loop circuit and rf frequency combiner circuit, Frequency Transfer analog phase-locked look electricity includes secondary signal amplifier, analogue phase detection device, filter amplifier, 10MHz crystal oscillators, second power splitter, No. nine frequency multipliers of SBD and the 3rd signal amplifier, rf frequency combiner circuit includes 90MHz Low phase noise crystal oscillators, modulator and the first signal amplifier, the present invention has lower phase noise characteristic, limitation of the intermodulation effect to rubidium frequency standard frequency stability can further be reduced.
Description
Technical field
The present invention relates to Rb atom frequency marking, and in particular to a kind of ultra-low noise frequency synthesis and frequency for rubidium frequency standard passes
Circuit is passed, using the ultralow phase noise characteristic of this circuit, can further improve Rb atom frequency marking frequency stability index.
Background technology
Atomic frequency standard is using atomic transition spectral line as with reference to obtained chronometer time signal output system, is widely used in society
The numerous areas that can be lived, such as navigator fix, punctual time service, accurate measurement, the communication technology, modern weapons high-precise synchronization.
Rb atom frequency marking turns into most widely used atomic frequency standard because it has the characteristics that small volume, in light weight, low in energy consumption.Rubidium atom
Frequency marking can simply be divided into quantized system and circuit system, and circuit system includes frequency synthesizer circuit, optical detection circuit, synchronous inspection
Ripple device and integration filter.The microwave that frequency synthesizer circuit is converted to 10MHz crystal oscillation signals the 6.834GHz modulated is sought
Resonant transition occurs for signal, feed-in physical system, excitation atom system, is detected using light, the technology such as synchronous detection is believed frequency discrimination
Number handled, obtain controlling the deviation correcting signal of 10MHz crystal oscillator frequencies.
Frequency stability is the core index of Rb atom frequency marking.Generally, rubidium frequency standard frequency stability is by physical system noise
Than being together decided on frequency synthesis system phase noise.The frequency synthesis system level of mutually making an uproar be restrict frequency stability it is important because
Element.Frequency synthesis system phase noise is converted into the white frequency noise being superimposed upon in frequency discrimination signal, referred to as intermodulation through physical system
Noise.Limitation of the intermodulation noise to frequency stability can be expressed as with Allan deviations：
Wherein υ0For the frequency of carrier signal, fMFor modulating frequency, L (2nfM) it is υ0In 2nfMLocate phase noise spectrum.
In a kind of common implementation, the frequency synthesis system of Rb atom frequency marking by 10MHz crystal oscillators, modulator, 9 times times
Frequency device, No. 76 frequency multipliers of step-recovery diode (SRD) and synthesizer composition.Typically negligible SRD frequency multipliers and synthesizer pair
Microwave seeks the influence that signal is mutually made an uproar.Conventional radio frequency frequency synthesis scheme is that triangular wave phase modulation (side is carried out to 10MHz crystal oscillation signals
Ripple frequency modulation), recycle the differential pair tube circuit of triode composition to carry out the frequency multiplication of two-stage 3, obtain the 90MHz signals modulated.Should
Resolution circuitry phase of output signal noise is larger, and wherein modulator and the frequency multiplication of the first order 3 are the critical pieces of deterioration of mutually making an uproar.Modulation
Device is located at 10MHz crystal oscillator rear classes, can deteriorate the level of mutually making an uproar of frequency multiplication input signal；The frequency multiplication of the first order 3 uses differential pair tube structure,
If transistor noise figure is big, additional phase noise can be introduced.In addition, the program also has that humorous clutter is big, debugging complexity etc.
Shortcoming.
Another scheme is to select 10MHz Low phase noise VCXOs, and signal enhanced processing, then profit are first carried out to it
30MHz signals are obtained with Schottky diode (SBD) frequency tripler, frequency-selective amplifier, two poles are held by double electric modulations using one kind
The controllable phase shifter that pipe and series resonant network are formed is as modulation circuit, and carrying out triangular wave phase modulation to 30MHz signals, (square wave is adjusted
Frequently), finally amplify through SBD frequency triplings and frequency-selecting to obtain the 90MHz output signals modulated again.The program utilizes SBD low noises
Characteristic, and by the way of modulation carrier wave is raised, 10MHz modulation is changed to 30MHz modulation, phase noise, which has, to be obviously improved.
Meanwhile the humorous noise performance of output signal spectrum of the program is excellent, 90MHz output spectrums are substantially only humorous comprising each time of 90MHz
Ripple, and the equal very little of each harmonic of 10MHz signals.Now the phase noise of 90MHz output spectrums is no longer limited by designed
Frequency multiplication, modulation and amplifying circuit link, and it is constrained to 10MHz Low phase noise VCXOs.
The content of the invention
It is an object of the invention to provide a kind of ultra-low noise frequency synthesis for rubidium frequency standard and Frequency Transfer scheme, tool
Have the advantages that low phase noise, humorous interference wave restranint are high, be easy to debugging.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard, including the first power splitter, in addition to
Frequency Transfer analog phase-locked loop circuit and rf frequency combiner circuit,
It is brilliant that Frequency Transfer analog phase-locked look electricity includes secondary signal amplifier, analogue phase detection device, filter amplifier, 10MHz
Shake, No. nine the second power splitter, SBD frequency multipliers and the 3rd signal amplifier,
Secondary signal amplifier out is connected with analogue phase detection device reference input, the 3rd signal amplifier output end with
Analogue phase detection device rf inputs are connected, and the output end of analogue phase detection device is connected with filter amplifier input, filter amplifier
Output end be connected with the voltage-controlled input of 10MHz crystal oscillators, the output end of 10MHz crystal oscillators is connected with the second power splitter input,
Wherein No. nine frequency multiplier inputs of output end and SBD are connected second power splitter all the way, the output of the second power splitter another way output end
10MHz frequency signals, No. nine frequency multiplier output ends of SBD are connected with the 3rd signal amplifier input,
Rf frequency combiner circuit includes 90MHz Low phase noises crystal oscillator, modulator and the first signal amplifier,
90MHz Low phase noises crystal oscillator is connected with the input of the first power splitter, the first power splitter wherein all the way output end with adjust
The first input end connection of device processed, the second input access 136Hz triangular waves of modulator, the output end of modulator and the first letter
The input connection of number amplifier, the first power splitter another way output end are connected with the input of secondary signal amplifier.
The output end of first signal amplifier as described above is connected with the first input end of SRD frequency multipliers, SRD frequency multipliers
The second input access 5.3125MHz signals, the output end of SRD frequency multipliers is connected with physical system, and physical system is led to successively
Preamplifier, lock detector, integration filter and 90MHz Low phase noises crystal oscillator is crossed to connect.
This circuit arrangement has the following advantages that relative to prior art：
1st, microwave, which seeks signal, has lower phase noise characteristic.Rf frequency combiner circuit uses in the present invention
90MHz Low phase noise crystal oscillators, lock it on physical system atomic transition spectral line.90MHz crystal oscillators are mutually made an uproar to pass through less than 10MHz crystal oscillators
The 90MHz phases that frequency multiplication obtains are made an uproar, and the frequency by raising crystal oscillator in ring, which can obtain lower microwave, to be sought signal and mutually make an uproar.
2nd, analog phase-locked look Frequency transfer is better than digital phase-locked loop.Frequency Transfer analog phase-locked loop circuit in the present invention
Using analog phase-locked look, 10MHz crystal oscillators are locked on 90MHz crystal oscillators.Frequency Transfer analog phase-locked loop circuit is using frequency multiplication and mixes
The mode of frequency phase demodulation, good phase noise level can be achieved, being capable of the lossless frequency stability characteristic for transmitting FLL.And count
Word phaselocked loop can only take frequency dividing mode, and frequency divider can introduce additional phase noise.
3rd, Frequency Transfer analog phase-locked loop circuit reliability is high.Can be all high using analog device, reliability.
Brief description of the drawings
Fig. 1 is the integrated circuit principle schematic of the present invention.
Fig. 2 is the circuit theory schematic diagram of No. nine frequency multipliers of SBD；
Fig. 3 is the circuit theory schematic diagram of modulator；
Fig. 4 is the circuit theory schematic diagram of the signal amplifier of the first signal amplifier/secondary signal amplifier/the 3rd；
Fig. 5 is the circuit theory schematic diagram of analogue phase detection device.
In figure：1-90MHz Low phase noise crystal oscillators；2- modulators；The signal amplifiers of 3- first；4-SRD frequency multipliers；5- departments of physics
System；6- preamplifiers；7- lock detectors；8- integration filters；The power splitters of 9- first；10- secondary signal amplifiers；11-
Analogue phase detection device；12- filter amplifiers；13-10MHz crystal oscillators；The power splitters of 14- second；No. nine frequency multipliers of 15-SBD；16- the 3rd
Signal amplifier；17- Frequency Transfer analog phase-locked loop circuits；18- rf frequency combiner circuits.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard, including rf frequency
Combiner circuit 18, rf frequency combiner circuit 18 include 90MHz Low phase noises crystal oscillator 1, the signal amplifier 3 of modulator 2 and first,
The output end of first signal amplifier 3 is connected with the first input end of SRD frequency multipliers 4, and the second of SRD frequency multipliers 4
Input accesses 5.3125MHz signals, and the output end of SRD frequency multipliers 4 is connected with physical system 5, before physical system 5 passes sequentially through
Amplifier 6, lock detector 7, integration filter 8 is put to be connected with 90MHz Low phase noises crystal oscillator 1.The output of first signal amplifier 3
The 90MHz signals modulated needed for the end output present invention.
As shown in figure 1, a kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard, in addition to frequency pass
Pass analog phase-locked loop circuit 17, Frequency Transfer analog phase-locked loop circuit 17 include secondary signal amplifier 10, analogue phase detection device 11,
Filter amplifier 12,10MHz crystal oscillators 13, the second power splitter 14, the signal amplifier 16 of No. nine frequency multipliers of SBD 15 and the 3rd.
90MHz Low phase noises crystal oscillator 1 is connected with the input of the first power splitter 9, the first power splitter 9 wherein all the way output end with
The input of secondary signal amplifier 10 connects, and the output end of secondary signal amplifier 10 connects with the reference input of analogue phase detection device 11
Connect.The output end of 10MHz crystal oscillators 13 is connected with the input of the second power splitter 9, the second power splitter 9 wherein output end and SBD all the way
No. nine input of frequency multiplier 15 connections, standard output 10MHz frequencies needed for the another way output end of the second power splitter 9 output rubidium frequency standard
Signal.No. nine output ends of frequency multiplier 15 of SBD are connected with the input of the 3rd signal amplifier 16, the output end of the 3rd signal amplifier 16
It is connected with the rf inputs of analogue phase detection device 11.The reference-input signal that analogue phase detection device 11 exports secondary signal amplifier 10
Mixing, which is carried out, with the radio-frequency input signals of the 3rd signal amplifier 16 output obtains phase error signal than mutually, phase error signal
The input of filter amplifier 12 is transferred to by the output end (intermediate frequency) of analogue phase detection device 11, filter amplifier 12 be filtered and
D. c. voltage signal is obtained after integration amplification, d. c. voltage signal is transferred to brilliant with 10MHz by the output end of filter amplifier 12
Shake 13 voltage-controlled input connection.The output end of 10MHz crystal oscillators 13 is connected with the input of the second power splitter 9.
The purpose of the technical program is to reduce ultra-low noise frequency synthesis and the Frequency Transfer simulation lock phase of Rb atom frequency marking
The phase noise for the 90MHz signals modulated in the ring of ring, and ensure the excellent harmonic characterisitic of output signal.Rubidium frequency standard tradition
Frequency synthesis scheme, as local oscillator, can not avoid the intrinsic 20log (9) that mutually makes an uproar that frequency multiplication is introduced using 10MHz crystal oscillators.The application
In the phase noise level of selected 90MHz crystal oscillators at 2 times of modulating frequencies of interest better than 10MHz crystal oscillators through 9 times times
Phase noise after frequency.In the application, in the modulator and the noise of signal amplifier for considering the connection of 90MHz crystal oscillators rear class meticulously
After characteristic, at 2 times of modulating frequencies, the 90MHz signals modulated, which mutually make an uproar mutually to make an uproar relative to 90MHz crystal oscillators, not to be deteriorated.Due to
Modulator and signal amplifier have excellent frequency-selecting function, export by modulation 90MHz signals harmonic characterisitic it is excellent.
As shown in figure 1, the application is used as local oscillator using 90MHz Low phase noises crystal oscillator 1, through the first power splitter 9, the and of modulator 2
First signal amplifier 9 generates the 90MHz signals modulated, and is sent into SRD frequency multipliers 4 and carries out 76 frequencys multiplication, the amplification of the first signal
Device 9 generates the 90MHz signals modulated and is mixed to obtain 6.834GHz microwaves letter with 5.3125MHz signals caused by synthesizer
Number, microwave signal is sent into physical system and interacted with atom, before light inspection signal of the output with modulating frequency information arrives
Put amplifier 6, it is voltage-controlled that light inspection signal through preamplifier 6, lock detector 7 and integration filter 8 obtains voltage control signal
90MHz crystal oscillators, realize that rubidium frequency standard closed loop locks.
90MHz Low phase noises crystal oscillator 1 exports 10MHz signals, concrete signal transmission through Frequency Transfer analog phase-locked loop circuit 17
Scheme is as follows：90MHz Low phase noises crystal oscillator 1 is sent into analogue phase detection device 11 with reference to defeated through the first power splitter 9, secondary signal amplifier 10
Enter end, 10MHz crystal oscillators 13 obtain radio frequency input letter through the second power splitter 14, No. nine frequency multipliers 15 of SBD, the 3rd signal amplifier 16
Number (90MHz signals) is sent into the rf inputs of analogue phase detection device 11, the filtered amplification of the output error signal of analogue phase detection device 11
Device 12 obtains voltage control signal, controls 10MHz VCXOs, realizes that phaselocked loop closed loop locks.
As shown in figure 5, SYPD-2 of the analogue phase detection device 11 using Mini-Circuits companies.SYPD-2 reference input
End is connected with resistance R4, and rf inputs are connected with resistance R5.
Filter amplifier 12 includes filter unit, integral unit and output unit,
As shown in figure 5, filter unit includes inductance L9, electric capacity C11, inductance L10, electric capacity C12；
As shown in figure 5, integral unit includes operational amplifier U1, resistance R6, electric capacity C13, resistance R8, resistance R7, electric capacity
C14；
As shown in figure 5, output unit includes operational amplifier U2, resistance R9, resistance R10, resistance R11, resistance R12.
The one end of the output end of analogue phase detection device 11 respectively with inductance L9 and inductance L10 is connected, inductance the L9 other end and electricity
Hold C11 one end connection, electric capacity C11 another termination electrically, the inductance L10 other end respectively with electric capacity C12 one end and electricity
R6 one end connection is hindered, electric capacity C12 another termination is electrically.The resistance R6 other end and operational amplifier U1 anti-phase input
End, resistance R7 one end connect with electric capacity C14 one end, the resistance R7 other ends and electric capacity the C14 other end and operational amplifier U1
Output end connection, calculate the one end of amplifier U1 output end also with resistance R9 and be connected, resistance R8 one end and the one of electric capacity C13
End is connected with operational amplifier U1 in-phase input end, and the resistance R8 other end and electric capacity C13 another termination are electrically.Resistance
The R9 other ends are connected with operational amplifier U2 inverting input and resistance R11 one end respectively, resistance the R11 other end and fortune
Calculate amplifier U2 output end connection, the one end of operational amplifier U2 output end also with resistance R12 connects, and the one of resistance R10
End is connected with operational amplifier U2 in-phase input end, and electrically, the resistance R12 other end exports resistance R10 another termination
The voltage-controlled voltage of direct current.
As shown in Fig. 2 No. nine frequency multipliers 15 of SBD include inductance L1, inductance L2, inductance L3, inductance L4, full-wave bridge rectifier
Device, electric capacity C1, electric capacity C2 and electric capacity C3, inductance L1 one end as input, the other end by electric capacity C1 connect electrically and
Also it is connected by full wave bridge rectifier with inductance L2 one end, the inductance L2 other ends are connect electrically by inductance L3, inductance L2 two
End is parallel with electric capacity C2, and inductance L3 both ends are parallel with electric capacity C3.
No. nine frequency multipliers of SBD 15 5~15MHz of incoming frequency, 25~30dB of conversion loss, input power 10~15dBm are humorous
Ripple suppresses 15~20dB.
As shown in figure 3, modulator 2, which includes double electricity, adjusts capister (VD1 and VD2), electric capacity C6 and inductance L5, inductance
L6.Carrier wave is inputted by electric capacity C4 ends, the output of electric capacity C5 ends.
The controllable phase-shift network frequency range 85MHz~95MHz of use of modulator 5,90 ° of phase shift range, insertion loss 1~
2dB。
As shown in figure 4, the first signal amplifier 3, the signal amplifier 16 of secondary signal amplifier 10 and the 3rd are cobasis
Amplifying circuit, grounded base amplification circuit include resistance R1, resistance R2, resistance R3, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, electricity
Feel L7, inductance L8, triode Q1, resistance R2 one end and inductance L7 one end are connected with power supply respectively, the resistance R2 other end and three
Pole pipe Q1 base stages are connected, and triode Q1 base stages are connect electrically by resistance R3, and the inductance L7 other ends are connected with triode Q1 collectors,
Triode Q1 collectors are connected with electric capacity C10 one end, and the electric capacity C10 other ends are parallel with electric capacity as output end, inductance L7 both ends
C7, triode Q1 emitter stages are connected with electric capacity C9 one end, and the electric capacity C9 other ends are as input, triode Q1 emitter stages and resistance
R1 one end is connected, and the resistance R1 other ends are connect electrically by inductance L8, and inductance L8 both ends are parallel with electric capacity C8.
As shown in figure 4, the first signal amplifier 3, the signal amplifier 16 of secondary signal amplifier 10 and the 3rd are using altogether
Base amplifying circuit, grounded base amplification circuit select the ambipolar triode Q1 of low noise, and resistance R1, resistance R2 and resistance R3 are three
Pole pipe Q1 provides biasing, and wherein inductance L8, electric capacity C8 reduce the loss of input signal, inductance L7, electric capacity as bandstop filter
C7 is amplified as common-base circuit frequency-selective network to useful signal, and signal is inputted by electric capacity C9 ends, the output of electric capacity C10 ends.
First signal amplifier 3, secondary signal amplifier 10 and the frequency range 80MHz of the 3rd signal amplifier 16~
110MHz, small-signal power gain>15dB, noise coefficient<2dB, linear power output>20dBm, maximal input 13dBm.
Embodiment 2
It can be seen from Fig. 1, rf frequency combiner circuit 18 is believed by 90MHz Low phase noises crystal oscillator 1, modulator 2 and first successively
Number amplifier 3 is formed by connecting.Design parameter is as follows.
90MHz Low phase noises crystal oscillator 1 is typically from the crystal oscillator mutually made an uproar less than -130dBc/Hz@100Hz, power output>
10dBm。
As shown in figure 3, the electric capacity C4 of the input coupling of modulator 2 is 220pF, electric capacity C5 is 220pF.Tuning coil L5 is
33nH, inductance L6 are 33nH, and tuning capacitance C6 is 56pF.
As shown in figure 4, in the circuit of the first signal amplifier 3.Resistance R1 is 200 Ω, and resistance R2 is 12k Ω, and resistance R3 is
15kΩ.The electric capacity C9 of input coupling is 300pF, and output coupling capacitor C10 is 100pF.Inductance L8 in emitting stage band resistance network
For 100nH, electric capacity C8 is 82pF.The inductance L7 of colelctor electrode frequency-selective network is 100nH, and electric capacity C7 is 56pF.
Using the 90MHz power that the technical scheme of above-mentioned parameter obtains, second harmonic is suppressed to -53dB for 18dBm.
As shown in figure 4, in the circuit of secondary signal amplifier 10.Resistance R1 is 200 Ω, and resistance R2 is 12k Ω, and resistance R3 is
15kΩ.The electric capacity C9 of input coupling is 300pF, and output coupling capacitor C10 is 100pF.Inductance L8 in emitting stage band resistance network
For 100nH, electric capacity C8 is 82pF.The inductance L7 of colelctor electrode frequency-selective network is 100nH, and electric capacity C7 is 56pF.
As shown in figure 4, in the circuit of the 3rd signal amplifier 16.Resistance R1 is 200 Ω, and resistance R2 is 12k Ω, and resistance R3 is
15kΩ.The electric capacity C9 of input coupling is 300pF, and output coupling capacitor C10 is 100pF.Inductance L8 in emitting stage band resistance network
For 100nH, electric capacity C8 is 82pF.The inductance L7 of colelctor electrode frequency-selective network is 100nH, and electric capacity C7 is 56pF.
As shown in figure 5, SYPD-2 of the analogue phase detection device 11 using Mini-Circuits companies, frequency is inputted with reference to radio frequency
Rate is 10MHz~200MHz, and optimal input power is 7dBm, and isolation is high, representative value 40dB, and direct current output scope is
700mV~1000mV.Resistance R4 is 50 Ω, and resistance R5 is 50 Ω.
As shown in figure 5, in filter amplifier 12.Inductance L9 is 100nH, and electric capacity C11 is 82pF, and inductance L10 is 560nH,
Electric capacity C12 is 470pF, and resistance R6 is 150k Ω, and resistance R7 is 510k Ω, and resistance R8 is 150k Ω, and resistance R9 is 15k Ω, electricity
Resistance R10 is 15k Ω, and resistance R11 is 51k Ω, and resistance R12 is 51k Ω, and electric capacity C13 is 220pF, and electric capacity C14 is 220pF.
Other are same as Example 1.
The 90MHz signal phases noise of the first signal amplifier 3 that the present invention obtains output offset carrier 272Hz~
Phase noise test result is shown in Table 1 in the range of 100kHz, substitutes into formula (1), and contribution of the intermodulation noise to stability be 8.6 ×
10-14/τ1/2。
Table 1,90MHz signal phase noise testing results
| @100Hz | @272Hz | @1kHz | @10kHz | @100kHz | |
| The present invention | -136dBc/Hz | -145dBc/Hz | -155dBc/Hz | -165dBc/Hz | -167dBc/Hz |
The Rb atom frequency marking made using the scheme of invention description, frequency stability index are had into 10-14Magnitude is dived
Power
Specific embodiment described herein is only to present invention explanation for example.The technical field of the invention
Technical staff can make various modifications or supplement or substitute to described specific embodiment, but not deviate the present invention
Marrow or surmount the scope defined outside appended claims.
Claims (2)
1. a kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard, including the first power splitter（9）, its feature
It is, in addition to Frequency Transfer analog phase-locked loop circuit（17）With rf frequency combiner circuit（18）,
Frequency Transfer analog phase-locked loop circuit（17）Including secondary signal amplifier（10）, analogue phase detection device（11）, filter and amplification
Device（12）, 10MHz crystal oscillators（13）, the second power splitter（14）, No. nine frequency multipliers of SBD（15）With the 3rd signal amplifier（16）,
Secondary signal amplifier（10）Output end and analogue phase detection device（11）Reference input connects, the 3rd signal amplifier（16）
Output end and analogue phase detection device（11）Rf inputs connect, analogue phase detection device（11）Output end and filter amplifier（12）It is defeated
Enter end connection, filter amplifier（12）Output end and 10MHz crystal oscillators（13）Voltage-controlled input connection, 10MHz crystal oscillators（13）
Output end and the second power splitter（14）Input connects, the second power splitter（14）Wherein output end and nine frequencys multiplication of SBD all the way
Device（15）Input connects, the second power splitter（14）Another way output end exports 10MHz frequency signals, No. nine frequency multipliers of SBD
（15）Output end and the 3rd signal amplifier（16）Input connects,
Rf frequency combiner circuit（18）Including 90MHz Low phase noise crystal oscillators（1）, modulator（2）With the first signal amplifier（3）,
90MHz Low phase noise crystal oscillators（1）With the first power splitter（9）Input connection, the first power splitter（9）Wherein output end all the way
With modulator（2）First input end connection, modulator（2）The second input access 136Hz triangular waves, modulator（2）'s
Output end and the first signal amplifier（3）Input connection, the first power splitter（9）Another way output end is amplified with secondary signal
Device（10）Input connection.
2. a kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard according to claim 1, it is special
Sign is, the first described signal amplifier（3）Output end and SRD frequency multipliers（4）First input end connection, SRD frequencys multiplication
Device（4）The second input access 5.3125MHz signals, SRD frequency multipliers（4）Output end and physical system（5）Connection, physics
System（5）Pass sequentially through preamplifier（6）, lock detector（7）, integration filter（8）With 90MHz Low phase noise crystal oscillators（1）
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710725150.2A CN107395200B (en) | 2017-08-22 | 2017-08-22 | Ultra-low noise frequency synthesis and frequency transfer circuit for rubidium frequency standard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710725150.2A CN107395200B (en) | 2017-08-22 | 2017-08-22 | Ultra-low noise frequency synthesis and frequency transfer circuit for rubidium frequency standard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107395200A true CN107395200A (en) | 2017-11-24 |
| CN107395200B CN107395200B (en) | 2023-11-10 |
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| CN201710725150.2A Active CN107395200B (en) | 2017-08-22 | 2017-08-22 | Ultra-low noise frequency synthesis and frequency transfer circuit for rubidium frequency standard |
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| CN112234986A (en) * | 2020-09-04 | 2021-01-15 | 上海鸿晔电子科技股份有限公司 | Signal source |
| CN112290895A (en) * | 2020-11-27 | 2021-01-29 | 中电科仪器仪表有限公司 | Low-noise radio frequency power amplifying circuit |
| CN114118430A (en) * | 2021-12-22 | 2022-03-01 | 中国科学技术大学 | Radio frequency system applied to quantum computation and local oscillator signal generation method |
| CN114448433A (en) * | 2021-12-23 | 2022-05-06 | 兰州空间技术物理研究所 | Low-noise microwave excitation source for cesium atomic clock |
| CN115955196A (en) * | 2023-03-14 | 2023-04-11 | 成都世源频控技术股份有限公司 | High-performance low-noise crystal oscillator circuit |
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| CN112234986A (en) * | 2020-09-04 | 2021-01-15 | 上海鸿晔电子科技股份有限公司 | Signal source |
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| CN112290895A (en) * | 2020-11-27 | 2021-01-29 | 中电科仪器仪表有限公司 | Low-noise radio frequency power amplifying circuit |
| CN114118430A (en) * | 2021-12-22 | 2022-03-01 | 中国科学技术大学 | Radio frequency system applied to quantum computation and local oscillator signal generation method |
| CN114448433A (en) * | 2021-12-23 | 2022-05-06 | 兰州空间技术物理研究所 | Low-noise microwave excitation source for cesium atomic clock |
| CN114448433B (en) * | 2021-12-23 | 2023-10-27 | 兰州空间技术物理研究所 | Low-noise microwave excitation source for cesium atomic clock |
| CN115955196A (en) * | 2023-03-14 | 2023-04-11 | 成都世源频控技术股份有限公司 | High-performance low-noise crystal oscillator circuit |
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