CN205070979U - Frequency source generating device - Google Patents
Frequency source generating device Download PDFInfo
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- CN205070979U CN205070979U CN201520770196.2U CN201520770196U CN205070979U CN 205070979 U CN205070979 U CN 205070979U CN 201520770196 U CN201520770196 U CN 201520770196U CN 205070979 U CN205070979 U CN 205070979U
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Abstract
The utility model discloses a frequency source generating device has solved and has gone strayly or make an uproar mutually in order to be adapted to this multiple frequency channel, need purchase the device of multiple letter model to lead to the problem of cost increase, its technical scheme main points are that the frequency multiplier switches the frequency multiplier that the module is used for switching different frequency channels, and the frequency multiplier switches the module and is coupled in the wave band input, first first detector is coupled in frequency multiplier switching module, has been coupled first frequency divider between phase discriminator and the wave band input, first frequency divider is coupled in the wave band input, the input of phase discriminator is coupled in first frequency divider, and the feedback of phase discriminator end is coupled in first first detector, and voltage -controlled oscillator is coupled in the phase discriminator, the utility model discloses a frequency source generating device switches the frequency channel that the module can adapt to multiple difference through the frequency multiplier, and simultaneously in the frequency channel of locating, it is possible little to guarantee that phase -locked N finishes, reduces phase noise and stray, puies forward the practicality, reduce cost.
Description
Technical field
The utility model relates to wireless communication technology field, and more particularly, it relates to a kind of frequency source generating means.
Background technology
Frequency synthesis technique is one of radar, the communication isoelectronic series system key technology realizing high performance index, and the functional realiey of a lot of modern electronic equipment and system, all directly depends on the performance of frequency synthesizer used; It can produce the discrete frequency signal of a large amount of high accuracy same with reference frequency source and stability, can meet the needs of modern communications multichannel and radar prompt change, tracking etc.Along with the fast development of modern radar, the communications industry, higher to the requirement of high-frequency, high stability.
The signal ultrashort signal being converted to hyper band is needed in general signal process, the signal again carrying out changing the hyper band that just can become required is needed by the signal source obtained after broken number frequency division synthesizer process, still the problem of making an uproar mutually with spuious can be there is in transfer process, and the signal source obtained after broken number frequency division synthesizer process is discrete signal source, there is larger interval, need the equipment of different frequency range corresponding with it, the function it being converted to ultra-high frequency band signal could be realized, so need to purchase multiple devices, cost increases, and in use there will be inconvenience, need continuous replacing, so current used frequency source generator has certain room for improvement.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide a kind of frequency source generating means, to adapt to more band environment, improves utilization rate.
For achieving the above object, the utility model provides following technical scheme: a kind of frequency source generating means, comprise wave band input and wave band output, described wave band input incoming reference signal, also comprises the first frequency mixer, voltage-controlled oscillator, phase discriminator and frequency multiplier handover module;
Described frequency multiplier handover module for switching the frequency multiplier of different frequency range,
Described frequency multiplier handover module is coupled to wave band input to receive reference signal, and output switching frequency-doubled signal;
Described first frequency mixer is coupled to frequency multiplier handover module and switches frequency-doubled signal to receive, and exports the first mixed frequency signal, and the local oscillations source of described first frequency mixer is provided by voltage-controlled oscillator;
The first frequency divider is coupled with between described phase discriminator and wave band input;
Described first frequency divider is coupled to wave band input to receive reference signal, and exports the first fractional frequency signal;
The input of described phase discriminator is coupled to the first frequency divider to receive the first fractional frequency signal, and the feedback end of described phase discriminator is coupled to the first frequency mixer to receive the first mixed frequency signal, and the output of described phase discriminator is to export phase discrimination signal
The control end of described voltage-controlled oscillator is coupled to the output of phase discriminator to receive phase discrimination signal and to control oscillator outputting oscillation signal to wave band output in response to phase discrimination signal with control voltage.
Preferably, described frequency multiplier handover module comprises the first switching frequency multiplier, the second switching frequency multiplier and diverter switch;
Described first switches the frequency multiplier that frequency multiplier is two frequencys multiplication;
Described second switching frequency multiplier is the frequency multiplier of frequency tripling;
Described diverter switch is respectively coupled to the first switching frequency multiplier and second and switches frequency multiplier and switch frequency multiplier switch for switching frequency multiplier and second to first.
Preferably, described diverter switch comprises the first single-pole double-throw switch (SPDT) and second single-pole double-throw switch (SPDT) of interlock setting, and the fixed contact of described first single-pole double-throw switch (SPDT) couples wave band input, and the fixed contact of described second single-pole double-throw switch (SPDT) is connected to the first frequency mixer.
Preferably, the second frequency mixer is coupled with between described phase discriminator and wave band input;
The second frequency divider is also coupled with between described wave band input and the second frequency mixer;
Reference signal received by described second frequency divider receiving wave range input, and export the second fractional frequency signal;
Described second frequency mixer is coupled to the second frequency divider to receive the second fractional frequency signal, and exports the second mixed frequency signal, and the first mixed frequency signal that the local oscillations source of described second frequency mixer is exported by the first frequency mixer provides;
The feedback end of described phase discriminator is coupled to the output of the second frequency mixer to receive the second mixed frequency signal;
The 4th switch is also coupled with to control whether the second frequency mixer to be accessed phase discriminator between described second frequency mixer and phase discriminator;
Also be coupled with the 3rd switch between described first frequency mixer and the second frequency mixer, phase discriminator, described 3rd switch is used for the first frequency mixer to access the second frequency mixer or phase discriminator.
The utility model hinge structure is compared to be had: can adapt to multiple different frequency range by frequency multiplier handover module, simultaneously in residing frequency range, ensures that phase-locked N is unexpectedly possible little, reduces phase noise and spuious, puies forward practicality, reduce costs.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is structural representation of the present utility model.
Embodiment
With reference to shown in Fig. 1, embodiment is described further.
A kind of frequency source generating means disclosed in the utility model, comprise wave band input and wave band output, wave band input incoming reference signal Vi, wave band output signal source output Vs, also comprise the first frequency mixer MIX1, voltage-controlled oscillator VCO, phase discriminator PFD and frequency multiplier handover module, phase discriminator PFD is a phase comparison device, it can compare the phase place of output feedback signal and input signal, and produce output error voltage vd (t), it is the function of phase error theta e (t), i.e. vd (t)=Kpsin (θ e (t)).Wherein function f (θ e (t)) is called phase characteristic.Phase characteristic has various ways, as sinuso sine protractor, triangle characteristic, sawtooth characteristic etc., as principle analysis, the phase discriminator PFD of usual use sinuso sine protractor, reason is that sinusoidal Theory comparison is ripe, analyzes simple and convenient, in fact various phase characteristic, when signal to noise ratio reduces, when small-signal operation, all trend towards sinuso sine protractor.Can with analog multiplier and low pass filter as the phase discriminator PFD with sinuso sine protractor.
Phase discriminator PFD has two kinds, and one is voltage-type PFD, output be voltage.Another kind is the PFD of charge-pump type, output be electric current.The PFD of what the present embodiment was mainly applied is voltage-type.
The Mathematical Modeling of sinusoidal phase discriminator PFD is:
vi(t)＝Visin(ω0t+θi(t))
v0(t)＝V0sin(ω0t+θ0(t))
θe(t)＝θi(t)-θ0(t)
vd(t)＝Kpsin(θe(t))
Wherein Kp=KmViV0/2, is sinusoidal phase characteristic.When loop enters locking, phase error is very little, has sin (θ e (t)) ≈ θ e (t).Now, error voltage vd (t) that phase discriminator PFD exports is proportional to phase error theta e (t), namely linear.
Voltage-controlled oscillator VCO is the device of frequency voltage transitions, and its frequency of oscillation changes linearly along with input control voltage, that is: ω v (t)=ω 0+K0vc (t)
Wherein ω v (t) is the instantaneous angular frequency of VCO; ω 0 is the centre frequency of VCO; K0 is the voltage-controlled sensitivity of voltage-controlled oscillator VCO.
The control characteristic of the voltage-controlled oscillator VCO in practical application is only in limited range of linearity control, and surpass after going beyond the scope, voltage-controlled sensitivity will decline.To formula above formula both sides integration, then the transfer function that Laulace conversion obtains voltage-controlled oscillator VCO can be expressed as:
θe(s)＝K0ve(s)/s
This expression formula has an integrating factor 1/s, and this is the integral relation formation between phase place and angular frequency.This is integral action is that VCO is intrinsic, and title voltage-controlled oscillator VCO is the intrinsic integral element in phase-locked loop usually.This integral action plays considerable effect in the loop.
Frequency multiplier makes output signal frequency equal the circuit of frequency input signal integral multiple, incoming frequency is f1, then output frequency is f0=nf1, and coefficient n is any positive integer, claims frequency multiplication number of times, frequency multiplier is of many uses, as master oscillator made to vibrate at lower frequency after transmitter employing frequency multiplier, to improve frequency stability, frequency modulation equipment frequency multiplier increases frequency shift (FS), in phase keying communication equipment, frequency multiplier is an important composition unit of carrier recovery circuit; Frequency mixer and output signal frequency equal two frequency input signal sums, difference or the circuit for both other combinations, and frequency mixer is made up of non-linear element and frequency-selective circuit usually.
Frequency multiplier handover module is for switching the frequency multiplier of different frequency range, frequency multiplier handover module comprises the first switching frequency multiplier, second switches frequency multiplier and diverter switch, first switches the frequency multiplier that frequency multiplier is two frequencys multiplication, second switching frequency multiplier is the frequency multiplier of frequency tripling, diverter switch is respectively coupled to the first switching frequency multiplier and second and switches frequency multiplier and switch frequency multiplier switch for switching frequency multiplier and second to first, diverter switch comprises the first single-pole double-throw switch (SPDT) K1 and the second single-pole double-throw switch (SPDT) K2 of interlock setting, the fixed contact of the first single-pole double-throw switch (SPDT) K1 couples wave band input, the fixed contact of the second single-pole double-throw switch (SPDT) K2 is connected to the first frequency mixer MIX1, first single-pole double-throw switch (SPDT) K1 and the second single-pole double-throw switch (SPDT) K2 is switched by control simultaneously, thus make the first switching frequency multiplier or the second switching frequency multiplier be pasted in main circuit, the process of the action of the first single-pole double-throw switch (SPDT) K1 and the second single-pole double-throw switch (SPDT) K2 can be extraneous Non-follow control, also Single-chip Controlling can be passed through, also again can add the 3rd simultaneously and switch frequency multiplier, 4th switches frequency multiplier etc., to adapt to wider frequency range.
Frequency multiplier handover module is coupled to wave band input to receive reference signal Vi, and output switching frequency-doubled signal, first frequency mixer MIX1 is coupled to frequency multiplier handover module and switches frequency-doubled signal to receive, and export the first mixed frequency signal, the local oscillations source of the first frequency mixer MIX1 is provided by voltage-controlled oscillator VCO, the first frequency divider is coupled with between phase discriminator PFD and wave band input, first frequency divider is coupled to wave band input to receive reference signal Vi, and export the first fractional frequency signal, the input of phase discriminator PFD is coupled to the first frequency divider to receive the first fractional frequency signal, the feedback end of phase discriminator PFD is coupled to the first frequency mixer MIX1 to receive the first mixed frequency signal, the output of phase discriminator PFD is to export phase discrimination signal, the control end of voltage-controlled oscillator VCO is coupled to the output of phase discriminator PFD to receive phase discrimination signal and to control oscillator VCO outputting oscillation signal to wave band output in response to phase discrimination signal with control voltage, make wave band output signal source output Vs.
The second frequency mixer MIX2 is coupled with between phase discriminator PFD and wave band input, the second frequency divider is also coupled with between wave band input and the second frequency mixer MIX2, reference signal received by second frequency divider receiving wave range input, and export the second fractional frequency signal, second frequency mixer MIX2 is coupled to the second frequency divider to receive the second fractional frequency signal, and export the second mixed frequency signal, the first mixed frequency signal that the local oscillations source of the second frequency mixer MIX2 is exported by the first frequency mixer MIX1 provides, the feedback end of phase discriminator PFD is coupled to the output of the second frequency mixer MIX2 to receive the second mixed frequency signal, the 4th K switch 4 is also coupled with to control whether the second frequency mixer MIX2 to be accessed phase discriminator PFD between second frequency mixer MIX2 and phase discriminator PFD, first frequency mixer MIX1 and the second frequency mixer MIX2, the 3rd K switch 3 is also coupled with between phase discriminator PFD, 3rd K switch 3 is for accessing the second frequency mixer MIX2 or phase discriminator PFD by the first frequency mixer MIX1.
The reference signal Vi of wave band input access can be certain value in 3225 ~ 3275Mhz, switch frequency multiplier by the first single-pole double-throw switch (SPDT) K1 and the second single-pole double-throw switch (SPDT) K2 to the first switching frequency multiplier and second to switch to obtain required frequency-doubled signal, according to be the first switching frequency multiplier, be two frequencys multiplication, the local oscillations source of the first frequency mixer MIX1 is provided by voltage-controlled oscillator VCO simultaneously, be 6 ~ 12Ghz, the signal source of a 5 ~ 2200Mhz is produced by the first frequency mixer MIX1, by the setting of the 3rd switch, the signal source made it possible to the first frequency mixer MIX1 produces directly accesses phase discriminator, simultaneously also can using the local oscillations source of signal source as the second frequency mixer MIX2, second frequency mixer MIX2 receives 800 ~ 1600Mhz by the second frequency divider, both produce a 50 ~ 500Mhz by the effect of the second frequency mixer MIX2, and by the 4th switch to control the feedback end whether signal source that the second frequency mixer MIX2 produces being input to phase discriminator PFD, the input of phase discriminator PFD receives the signal source of 100Mhz by the first frequency divider, effect by phase discriminator PFD and the calculating by formula 20*logN, N is second fractional frequency signal of feedback signal divided by input of feedback end, namely when size and the second fractional frequency signal equal and opposite in direction of feedback signal, phase discriminator PFD can be made to export DC level, control voltage controls oscillator VCO exports 6 ~ 12Ghz signal source at wave band output.
Multiple different frequency range can be adapted to by frequency multiplier handover module, simultaneously in residing frequency range, ensure that phase-locked N is unexpectedly possible little, reduce phase noise and spuious, put forward practicality, reduce costs.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (4)
1. a frequency source generating means, comprises wave band input and wave band output, and described wave band input incoming reference signal, is characterized in that: also comprise the first frequency mixer, voltage-controlled oscillator, phase discriminator and frequency multiplier handover module;
Described frequency multiplier handover module for switching the frequency multiplier of different frequency range,
Described frequency multiplier handover module is coupled to wave band input to receive reference signal, and output switching frequency-doubled signal;
Described first frequency mixer is coupled to frequency multiplier handover module and switches frequency-doubled signal to receive, and exports the first mixed frequency signal, and the local oscillations source of described first frequency mixer is provided by voltage-controlled oscillator;
The first frequency divider is coupled with between described phase discriminator and wave band input;
Described first frequency divider is coupled to wave band input to receive reference signal, and exports the first fractional frequency signal;
The input of described phase discriminator is coupled to the first frequency divider to receive the first fractional frequency signal, and the feedback end of described phase discriminator is coupled to the first frequency mixer to receive the first mixed frequency signal, and the output of described phase discriminator is to export phase discrimination signal
The control end of described voltage-controlled oscillator is coupled to the output of phase discriminator to receive phase discrimination signal and to control oscillator outputting oscillation signal to wave band output in response to phase discrimination signal with control voltage.
2. a kind of frequency source generating means according to claim 1, is characterized in that: described frequency multiplier handover module comprises the first switching frequency multiplier, second and switches frequency multiplier and diverter switch;
Described first switches the frequency multiplier that frequency multiplier is two frequencys multiplication;
Described second switching frequency multiplier is the frequency multiplier of frequency tripling;
Described diverter switch is respectively coupled to the first switching frequency multiplier and second and switches frequency multiplier and switch frequency multiplier switch for switching frequency multiplier and second to first.
3. a kind of frequency source generating means according to claim 2, it is characterized in that: described diverter switch comprises the first single-pole double-throw switch (SPDT) and second single-pole double-throw switch (SPDT) of interlock setting, the fixed contact of described first single-pole double-throw switch (SPDT) is coupled to wave band input, and the fixed contact of described second single-pole double-throw switch (SPDT) is coupled to the first frequency mixer.
4. a kind of frequency source generating means according to claim 1 or 2 or 3, is characterized in that: be coupled with the second frequency mixer between described phase discriminator and wave band input;
The second frequency divider is also coupled with between described wave band input and the second frequency mixer;
Reference signal received by described second frequency divider receiving wave range input, and export the second fractional frequency signal;
Described second frequency mixer is coupled to the second frequency divider to receive the second fractional frequency signal, and exports the second mixed frequency signal, and the first mixed frequency signal that the local oscillations source of described second frequency mixer is exported by the first frequency mixer provides;
The feedback end of described phase discriminator is coupled to the output of the second frequency mixer to receive the second mixed frequency signal;
The 4th switch is also coupled with to control whether the second frequency mixer to be accessed phase discriminator between described second frequency mixer and phase discriminator;
Also be coupled with the 3rd switch between described first frequency mixer and the second frequency mixer, phase discriminator, described 3rd switch is used for the first frequency mixer to access the second frequency mixer or phase discriminator.
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| CN201520770196.2U CN205070979U (en) | 2015-09-30 | 2015-09-30 | Frequency source generating device |
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| CN113381779A (en) * | 2021-06-15 | 2021-09-10 | 中国科学院上海微系统与信息技术研究所 | Ultra-wideband receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113381779A (en) * | 2021-06-15 | 2021-09-10 | 中国科学院上海微系统与信息技术研究所 | Ultra-wideband receiver |
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