CN209497453U - A kind of linear frequency sweep local oscillator - Google Patents
A kind of linear frequency sweep local oscillator Download PDFInfo
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- CN209497453U CN209497453U CN201920240926.6U CN201920240926U CN209497453U CN 209497453 U CN209497453 U CN 209497453U CN 201920240926 U CN201920240926 U CN 201920240926U CN 209497453 U CN209497453 U CN 209497453U
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Abstract
The utility model discloses a kind of linear frequency sweep local oscillators, belong to communication technique field, including derived reference signal and local oscillator output end, it is characterised in that: further include the first power divider being connected between derived reference signal and local oscillator output end, digital frequency divider, phase-locked loop module, the second power divider, point frequency source and frequency mixer；Wherein, the output end of derived reference signal is electrically connected with the reference input of the reference input of frequency source and digital frequency divider respectively after passing through the first power divider, the output end of point frequency source is electrically connected with the first input end of frequency mixer, the swept-frequency signal output end of digital frequency divider is electrically connected with the reference signal input terminal of phase-locked loop module, the output end of phase-locked loop module is electrically connected with the second input terminal of local oscillator output end and frequency mixer respectively after passing through the second power divider, and the output end of frequency mixer is electrically connected with the loop signal input terminal of phase-locked loop module.The utility model is capable of providing a kind of high-resolution linear frequency sweep local oscillator with rapid frequency-sweeping and locking phase.
Description
Technical field
The utility model belongs to communication technique field, and in particular to a kind of linear frequency sweep local oscillator for radio system.
Background technique
Local oscillator (LO), i.e. local oscillator, in radar, the radio systems such as communication and remote control, frequency sweep local oscillator is as frequency
The core of rate and power detection, the continuity of output frequency determine the integrality and accuracy of detection.In the prior art,
Frequency sweep local oscillator includes sequentially connected derived reference signal, digital frequency divider and filter, the output and number point of derived reference signal
The input of frequency device is electrically connected, and the output of digital frequency divider is electrically connected with the input of filter, and the output of filter is final output
Signal, the minimum step of final output signal frequency are limited to the bit wide of register in digital frequency divider, and curve of output is in frequency
Zigzag fashion is had on domain, the bit wide of register and the relationship of step frequency are F0/2n, wherein F0 is the reference of digital frequency divider
Frequency, it can be seen that, the minimum step of output frequency cannot be less than F0/2n.This requires can have a kind of elimination zigzag fashion
High-resolution fast linear frequency sweep local oscillator, realize frequency domain serialization output.
In the prior art, for the phase-locked loop module of phaselocked loop have reference signal input terminal, loop signal input terminal and
Output end, when output end be electrically connected with loop signal input terminal with the phase discriminator into locking phase module provide phase information for pair
When the locking phase control of locking phase module output signal, that is, constitute a complete phaselocked loop.
Utility model content
The utility model aim is, provides a kind of high-resolution linear frequency sweep local oscillator with rapid frequency-sweeping and locking phase.
Technical solution provided by the utility model is: a kind of linear frequency sweep local oscillator, including derived reference signal and local oscillator output
End, further includes the first power divider, digital frequency divider, locking phase ring moulds being connected between derived reference signal and local oscillator output end
Block, the second power divider, point frequency source and frequency mixer；Wherein, the output end of derived reference signal passes through after the first power divider
It is electrically connected respectively with the reference input of the reference input of frequency source and digital frequency divider, puts the output end and frequency mixer of frequency source
First input end electrical connection, the swept-frequency signal output end of digital frequency divider and the reference signal input terminal of phase-locked loop module are electrically connected
It connects, the output end of phase-locked loop module passes through the second input terminal with local oscillator output end and frequency mixer respectively after the second power divider
Electrical connection, the output end of frequency mixer are electrically connected with the loop signal input terminal of phase-locked loop module.Preferably, digital frequency divider and lock
First filter is equipped between phase ring moulds block.Preferably, second filter and amplification are equipped between frequency mixer and phase-locked loop module
Device.
In one embodiment of the utility model, the phase-locked loop module includes sequentially connected phase discriminator, active filter
Wave loop and voltage controlled oscillator.
Further improvement to above-mentioned technical proposal is that the phase discriminator is the digital phase detection for supporting wide loop bandwidth
Device.
Further improvement to above-mentioned technical proposal is that the voltage controlled oscillator is wideband voltage controlled oscillator.
Further improvement to above-mentioned technical proposal is that described frequency source is Low phase noise fractional frequency division frequency source.
Further improvement to above-mentioned technical proposal is that the phase-locked loop module is integer-N PLL module.
One aspect bring one of the utility model has the technical effect that digital frequency divider executes linear frequency sweep as lock
The reference signal of phase ring, phase lock control generate the voltage-controlled voltage controlled oscillator of expected frequency, its function point is mixed with point frequency source
Identical frequency is referred to phaselocked loop, mixing locking phase is realized, eliminates the step of frequency sweep local oscillator output frequency, reach quick
The purpose of frequency sweep and locking phase, improves the precision of the stepping of frequency sweep local oscillator, and simplify circuit structure and space layout, cost
Also it is under control.
Detailed description of the invention
Fig. 1 is the system module schematic diagram of the utility model one embodiment；
Fig. 2 is the system module schematic diagram of the utility model one embodiment；
Fig. 3 is the circuit diagram of first filter in the utility model one embodiment；
Fig. 4 is the circuit diagram of active power filtering loop in the utility model one embodiment；
The frequency curve of Fig. 5 local oscillator output signal in the prior art, horizontal axis is the time, and the longitudinal axis is frequency；
The frequency curve of local oscillator output signal in Fig. 6 the utility model one embodiment, horizontal axis are the time, and the longitudinal axis is frequency
Rate.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the present embodiment is a kind of linear frequency sweep local oscillator, frequency domain curve of output has the spy of low frequency steps
Point further includes being connected between derived reference signal and local oscillator output end specifically, including derived reference signal and local oscillator output end
First power divider, digital frequency divider, phase-locked loop module, the second power divider, point frequency source and frequency mixer；Wherein, it refers to
The output end of signal source passes through the reference with the reference input and digital frequency divider of frequency source respectively after the first power divider
Input terminal electrical connection, the output end for putting frequency source are electrically connected with the first input end of frequency mixer, and the swept-frequency signal of digital frequency divider is defeated
Outlet is electrically connected with the reference signal input terminal of phase-locked loop module, and the output end of phase-locked loop module passes through after the second power divider
It is electrically connected respectively with the second input terminal of local oscillator output end and frequency mixer, the output end of frequency mixer and the circuit of phase-locked loop module are believed
The electrical connection of number input terminal.Preferably, first filter is equipped in the present embodiment between digital frequency divider and phase-locked loop module；Mixing
Second filter and amplifier are equipped between device and phase-locked loop module；Phase-locked loop module includes sequentially connected phase discriminator, active
Filtering loop and voltage controlled oscillator.As shown in Fig. 2, can also be in the output end of phaselocked loop in the other embodiments of the utility model
Additional active power filtering loop and voltage controlled oscillator are set gradually between the second power divider.The first filter in the present embodiment
Passive filtering network as shown in Figure 3 can be used in wave device or second filter.Active power filtering loop in the present embodiment can
To use active power filtering loop as shown in Figure 4, with realize low current frequency-region signal to voltage filter and amplification.
The present embodiment by the first power divider, digital frequency divider, first filter, phaselocked loop, the second power divider,
Frequency mixer, point frequency source, second filter and amplifier form the loop with the phase-locked function；Derived reference signal passes through first
Power divider is divided into two paths of signals, provides reference all the way for digital frequency divider, another way provides reference for a frequency source；Number point
The output of frequency device generates a clean swept-frequency signal by first filter, provides reference for phaselocked loop；Second filter will
Loop signal spuious of the input phaselocked loop for phase demodulation is preferably minimized；Phaselocked loop controls voltage controlled oscillation by active power filtering loop
The phase-locked loop signal that device is mixed with point frequency source obtains low spurious, frequency sweep output frequency of the frequency domain without step, the active power filtering
Loop input is high-frequency current signal, exports the voltage signal for high impedance；The present embodiment and simple using digital frequency divider
Frequency sweep local oscillator is compared, and the range of output frequency no longer by selecting the frequency range of digital frequency divider to constrain, eliminates output frequency
In the step of frequency domain, improve frequency sweep precision, the design of frequency sweep local oscillator it is more flexible.
In the present embodiment: phaselocked loop is integral frequency divisioil, and built-in phase discriminator is the digital phase discriminator of low noise, in ultralow band
Phase noise supports wide loop bandwidth；First power divider is two-way power divider, and two channel separations are more than or equal to
30dB, it is ensured that the two-way reference signal for being respectively supplied to digital frequency divider and point frequency source is not interfere with each other；Second power divider
For two-way power divider, two channel separations are more than or equal to 20dB, and the output signal for being supplied to reality output end will not influence
To the loop signal for being supplied to frequency mixer；The precision of digital frequency divider is 1/232, ensure that minimum frequency stepping, simplify active
The design of filtering loop；The amplification factor of amplifier is 20dB, cannot deteriorate the phase noise of signal, it is ensured that enter phaselocked loop
Loop signal quality；Frequency mixer is the double balanced mixer of versatility, and the isolation of local oscillator and radio frequency is more than or equal to 50dB,
Local oscillation signal and point-frequency signal will not have an impact output signal；The maximum bandwidth of first filter and second filter is ginseng
The 1/2 of signal source frequency is examined, is more than or equal to 60dBc in ± 30MHz Out-of-band rejection, both ensure that the reference signal into phaselocked loop
Quality, but optimization enters the quality of the loop signal of phase-locked loop；Voltage controlled oscillator is wideband voltage controlled oscillator, guarantees output
The swept frequency range and amplitude of signal；Derived reference signal frequency stability is ± 0.1ppm, and sinewave output, amplitude is more than or equal to
10dBm, 1kHz phase noise are better than -155dBc/Hz, and the amplitude and phase noise of reference directly affects digital frequency divider output frequency
The quality of rate quality and point frequency source output frequency, for the quality for guaranteeing output signal, the amplitude and phase of crystal oscillator in derived reference signal
Position noise need to reach certain quality required to ensure final output signal；Point frequency source is Low phase noise fractional frequency division frequency source.
The ring width of active filtering loop is set to suitable value, loop voltage, which exports, can be achieved linear change, can be realized
The linear frequency sweep of zigzag fashion is eliminated, as shown in figure 5, the frequency curve of frequency sweep local oscillator output is serrated in the prior art, is sawed
Minimum constructive height difference between tooth is F0/2n, as shown in fig. 6, frequency sweep local oscillator is defeated after using circuit structure provided in this embodiment
Frequency curve out is serrated, and those skilled in the art are easy by adjusting relevant circuit parameter to be suitable for different
System requires.
In the circuit of the present embodiment, the second power splitter, frequency mixer, the second filter are sequentially connected in the output end of phase-locked loop module
The loop signal input terminal that phase-locked loop module is accessed after wave device and amplifier forms the signal loopback channel for being used for phase demodulation, letter
The loop signal in number loopback channel and the reference signal of reference signal input terminal are completed by phase demodulation, quick filter and voltage controlled oscillation
The locking phase of output, so that realizing with digital frequency divider output is the mixing locking phase referred to, so that frequency coverage is not counted
Word frequency divider constrains the linear frequency sweep, it can be achieved that any frequency range, eliminates the step of frequency sweep local oscillator output frequency, realizes frequency
The LINEAR CONTINUOUS in domain exports, and improves the precision of the stepping of frequency sweep local oscillator, and simplify circuit structure and space layout, cost
Also it is under control.
Embodiment described above is only the preferred embodiment of the utility model, and the not feasible implementation of the utility model
Exhaustion.For persons skilled in the art, it is made under the premise of without departing substantially from the utility model principle and spirit
Any obvious change out, should all be contemplated as falling within the claims of the utility model.
Claims (8)
1. a kind of linear frequency sweep local oscillator, including derived reference signal and local oscillator output end, it is characterised in that: further include being connected to reference
The first power divider, digital frequency divider, phase-locked loop module, the second power divider between signal source and local oscillator output end,
Point frequency source and frequency mixer；Wherein, the output end of derived reference signal passes through the reference with frequency source respectively after the first power divider
The electrical connection of the reference input of input terminal and digital frequency divider, the first input end of the output end and frequency mixer of putting frequency source are electrically connected
It connects, the swept-frequency signal output end of digital frequency divider is electrically connected with the reference signal input terminal of phase-locked loop module, phase-locked loop module
Output end is electrically connected with the second input terminal of local oscillator output end and frequency mixer respectively after passing through the second power divider, frequency mixer
Output end is electrically connected with the loop signal input terminal of phase-locked loop module.
2. a kind of linear frequency sweep local oscillator according to claim 1, it is characterised in that: digital frequency divider and phase-locked loop module it
Between be equipped with first filter.
3. a kind of linear frequency sweep local oscillator according to claim 1, it is characterised in that: set between frequency mixer and phase-locked loop module
There are second filter and amplifier.
4. a kind of linear frequency sweep local oscillator according to any one of claims 1 to 3, it is characterised in that: the phase-locked loop module
Including sequentially connected phase discriminator, active power filtering loop and voltage controlled oscillator.
5. a kind of linear frequency sweep local oscillator according to claim 4, it is characterised in that: the phase discriminator is to support wide loop band
Wide digital phase discriminator.
6. a kind of linear frequency sweep local oscillator according to claim 4, it is characterised in that: the voltage controlled oscillator is that broadband is voltage-controlled
Oscillator.
7. a kind of linear frequency sweep local oscillator according to claim 4, it is characterised in that: described frequency source is Low phase noise decimal minute
Frequency frequency source.
8. according to claim 1 to a kind of 3 or 5 to 7 described in any item linear frequency sweep local oscillators, it is characterised in that: the locking phase
Ring moulds block is integer-N PLL module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920240926.6U CN209497453U (en) | 2019-02-26 | 2019-02-26 | A kind of linear frequency sweep local oscillator |
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| CN201920240926.6U CN209497453U (en) | 2019-02-26 | 2019-02-26 | A kind of linear frequency sweep local oscillator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823140A (en) * | 2019-11-11 | 2020-02-21 | 华滋奔腾（苏州）安监仪器有限公司 | Demodulator and demodulation method based on frequency mixer and power detector strain sensor |
| CN110927686A (en) * | 2019-12-17 | 2020-03-27 | 陕西长岭电子科技有限责任公司 | Modulation frequency deviation mapping device for linear frequency modulation signal |
| CN113422604A (en) * | 2021-08-24 | 2021-09-21 | 深圳市鼎阳科技股份有限公司 | Frequency synthesizer |
-
2019
- 2019-02-26 CN CN201920240926.6U patent/CN209497453U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823140A (en) * | 2019-11-11 | 2020-02-21 | 华滋奔腾（苏州）安监仪器有限公司 | Demodulator and demodulation method based on frequency mixer and power detector strain sensor |
| CN110927686A (en) * | 2019-12-17 | 2020-03-27 | 陕西长岭电子科技有限责任公司 | Modulation frequency deviation mapping device for linear frequency modulation signal |
| CN113422604A (en) * | 2021-08-24 | 2021-09-21 | 深圳市鼎阳科技股份有限公司 | Frequency synthesizer |
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